Publications

Ardizzone I, Zingl M, Teyssier J, Strand HUR, Peil O, Fowlie J, Georgescu AB, Catalano S, Bachar N, Kuzmenko A, Gibert Gutierrez M, Triscone J-M, Georges A, Van Der Marel D.

Physical Review. B, Condensed Matter. 2020;102(15):155148

Materials with strong electronic correlations host remarkable — and technologically relevant — phenomena such as magnetism, superconductivity and metal-insulator transitions. Harnessing and controlling these effects is a major challenge, on which key advances are being made through lattice and…

Nedoliuk IO, Hu S, Geim AK, Kuzmenko A.

Nature Nanotechnology. 2019;14(8):756-761

When two-dimensional electron gases (2DEGs) are exposed to a magnetic field, they resonantly absorb electromagnetic radiation via electronic transitions between Landau levels1. In 2DEGs with a Dirac spectrum, such as graphene, theory predicts an exceptionally high infrared magneto-absorption, even…

Luo W, Boselli M, Poumirol J-M, Ardizzone I, Teyssier J, Van Der Marel D, Gariglio S, Triscone J-M, Kuzmenko A.

Nature Communications. 2019;10(2774)

Probing the local transport properties of two-dimensional electron systems (2DES) confined at buried interfaces requires a non-invasive technique with a high spatial resolution operating in a broad temperature range. In this paper, we investigate the scattering-type scanning near field optical…

Borroni S, Teyssier J, Piekarz P, Kuzmenko A, Oleś AM, Lorenzana J, Carbone F.

Physical Review. B, Condensed Matter. 2018;98(18)

We present inelastic light scattering data on a single crystal of magnetite (Fe3O4) across the Verwey transition. We identify anomalies of the lattice vibrations that originate from strong coupling to electronic excitations. We reveal spectroscopic signatures of diffusive modes in the electronic…

Yang L, Tian J, Giddens H, Poumirol J-M, Wu JB, Kuzmenko A, Hao Y.

Applied physics letters. 2018;112(15):151103

At the terahertz spectrum, the 2D material graphene has diagonal and Hall conductivities in the presence of a magnetic field. These peculiar properties provide graphene-based structures with a magnetically tunable response to electromagnetic waves. In this work, the absolute reflection intensity…

Tamagnone M, Slipchenko TM, Moldovan C, Liu PQ, Centeno A, Hasani H, Zurutuza A, Ionescu AM, Martin-Moreno L, Faist J, Mosig JR, Kuzmenko A, Poumirol J-M.

Physical review. 2018;97(24):241410

Faraday rotation is a fundamental property present in all nonreciprocal optical elements. In the THz range, graphene displays strong Faraday rotation; unfortunately, it is limited to frequencies below the cyclotron resonance. Here, we show experimentally that in specifically designed metasurfaces,…

Nedoliuk I.

The goal of this work is measuring magneto-optical spectra of high quality graphene crystals in the terahertz and infrared regions in order to understand magneto-optical phenomena in graphene unperturbed by defects, impurities, inhomogeneities of chemical potential, etc. For this purpose we used…

Chhikara M, Gaponenko I, Paruch P, Kuzmenko A.

2D materials. 2017;4(2):025081

Graphene is a mechanically robust 2D material promising for flexible optoelectronic applications. However, its electromagnetic properties under strain are experimentally poorly understood. Here we present the far-infrared transmission spectra of large-area chemical-vapor deposited monolayer…

Poumirol J-M, Liu PQ, Slipchenko TM, Nikitin AY, Martin-Moreno L, Faist J, Kuzmenko A.

Nature communications. 2017;8(1):14626

The magnetic circular dichroism and the Faraday rotation are the fundamental phenomena of great practical importance arising from the breaking of the time reversal symmetry by a magnetic field. In most materials, the strength and the sign of these effects can be only controlled by the field value…

Ubrig N, Jo S, Philippi M, Costanzo D, Berger H, Kuzmenko A, Morpurgo A.

Nano letters. 2017;17(9):5719-5725

The band structure of many semiconducting monolayer transition metal dichalcogenides (TMDs) possesses two degenerate valleys, with equal and opposite Berry curvature. It has been predicted that, when illuminated with circularly polarized light, interband transitions generate an unbalanced…

Baldini E, Mann A, Benfatto L, Cappelluti E, Acocella A, Silkin V M, Eremeev S V, Kuzmenko A, Borroni S, Tan T, Xi X X, Zerbetto F, Merlin R, Carbone F.

Physical review letters. 2017;119(9):097002

In systems having an anisotropic electronic structure, such as the layered materials graphite, graphene, and cuprates, impulsive light excitation can coherently stimulate specific bosonic modes, with exotic consequences for the emergent electronic properties. Here we show that the population of E2g …

Klimin SA, Kuzmenko A, Kashchenko MA, Popova MN.

Physical review. 2016;93(5):054304

We present a comparative far-infrared reflection spectroscopy study of phonons, phase transitions, spin-phonon, and electron-phonon interactions in isostructural multiferroic iron borates of gadolinium and terbium. The behavior of phonon modes registered in a wide temperature range is consistent…

Tamagnone M, Moldovan C, Poumirol J-M, Kuzmenko A, Ionescu AM, Mosig JR, Perruisseau-Carrier J.

Nature communications. 2016;7(1):11216

Isolators, or optical diodes, are devices enabling unidirectional light propagation by using non-reciprocal optical materials, namely materials able to break Lorentz reciprocity. The realization of isolators at terahertz frequencies is a very important open challenge made difficult by the…

De Visser PJ, Levallois J, Tran M, Poumirol J-M, Nedoliuk I, Teyssier J, Uher C, Van Der Marel D, Kuzmenko A.

Physical Review Letters. 2016;117(1):017402

We measure the far-infrared reflectivity and Kerr angle spectra on a high-quality crystal of pure semimetallic bismuth as a function of magnetic field, from which we extract the conductivity for left- and right-handed circular polarizations. The high spectral resolution allows us to separate the…

Levallois J, Nedoliuk I, Crassee I, Kuzmenko A.

Review of scientific instruments. 2015;86(3):033906

We describe a simple magneto-optical experiment and introduce a magneto-optical Kramers-Kronig analysis (MOKKA) that together allow extracting the complex dielectric function for left- and right-handed circular polarizations in a broad range of frequencies without actually generating circularly…

Tran M, Levallois J, Akrap A, Teyssier J, Kuzmenko A, Levy F, Tediosi R, Brandt MP, Lerch P, Van Der Marel D.

Review of scientific instruments. 2015;86(10):105102

We present an optical setup for spectroscopic measurements in the infrared and of Raman shift under high pressure and at low temperature. Using a membrane-driven diamond anvil cell, the pressure can be tuned in situ up to 20 GPa and the temperatures ranges from room temperature down to 18 K in…

Cappelluti E, Benfatto L, Kuzmenko A.

Physica scripta. 2014;T162:014018

Recent optical measurements in bilayer graphene have reported a strong dependence on phonon peak intensity, as well on the asymmetric Fano lineshape, on the charge doping and on the bandgap, tuned by gate voltage. In this paper, we show how these features can be analyzed and predicted on a…

Tran M, Levallois J, Lerch P, Teyssier J, Kuzmenko A, Autès G, Yazyev O V, Ubaldini A, Giannini E, Van Der Marel D, Akrap A.

Physical review letters. 2014;112(4):047402

BiTeI is a giant Rashba spin splitting system, in which a noncentrosymmetric topological phase has recently been suggested to appear under high pressure. We investigated the optical properties of this compound, reflectivity and transmission, under pressures up to 15 GPa. The gap feature in the…

Levallois J, Chudzinski P, Hancock JN, Kuzmenko A, Van Der Marel D.

Physical review. B, Condensed matter and materials physics. 2014;89(15):155123

We report the magnetic-field-dependent far-infrared reflectivity of polycrystalline bismuth. We observe four distinct absorptions that we attribute to magnetoplasmon resonances, which are collective modes of an electron-hole liquid in a magnetic field and become optical and acoustic resonances of…

Jo S, Ubrig N, Berger H, Kuzmenko A, Morpurgo A.

Nano letters. 2014;14(4):2019-2025

We have realized ambipolar ionic liquid gated field-effect transistors based on WS2 mono- and bilayers, and investigated their opto-electronic response. A thorough characterization of the transport properties demonstrates the high quality of these devices for both electron and hole accumulation,…

Akrap A, Teyssier J, Magrez A, Bugnon P, Berger H, Kuzmenko A, Van Der Marel D.

Physical review. B, Condensed matter and materials physics. 2014;90(3):1-6

We present a comparative study of the optical properties—reflectance, transmission, and optical conductivity—and Raman spectra of two layered bismuth-tellurohalides BiTeBr and BiTeCl at 300 and 5 K, for light polarized in the a-b planes. Despite different space groups, the optical properties of …

Ubrig N, Jo S, Berger H, Morpurgo A, Kuzmenko A.

Applied physics letters. 2014;104(17):171112

We perform scanning photocurrent microscopy on WS2 ionic liquid-gated field effect transistors exhibiting high-quality ambipolar transport. By properly biasing the gate electrode, we can invert the sign of the photocurrent showing that the minority photocarriers are either electrons or holes. Both…

van Mechelen JLM, Kuzmenko A, Merbold H.

Optics letters. 2014;39(13):3853

Gutierrez Lezama I, Ubaldini A, Longobardi M, Giannini E, Renner C, Kuzmenko A, Morpurgo A.

2D materials. 2014;1(2):021002

Semiconducting transition metal dichalcogenides (TMDs) have emerged as materials that can be used to realize two-dimensional (2D) crystals possessing rather unique transport and optical properties. Most research has so far focused on sulfur and selenium compounds, while tellurium-based materials…

Ubrig N, Crassee I, Levallois J, Nedoliuk I, Fromm F, Kaiser M, Seyller T, Kuzmenko A.

Optics express. 2013;21(21):24736-24741

We demonstrate that giant Faraday rotation in graphene in the terahertz range due to the cyclotron resonance is further increased by constructive Fabry-Perot interference in the supporting substrate. Simultaneously, an enhanced total transmission is achieved, making this effect doubly advantageous…

Chen J, Nesterov ML, Nikitin AY, Thongrattanasiri S, Alonso-González P, Slipchenko TM, Speck F, Ostler M, Seyller T, Crassee I, Koppens FHL, Martin-Moreno L, García de Abajo FJ, Kuzmenko A, Hillenbrand R.

Nano letters. 2013;13(12):6210-6215

We employ tip-enhanced infrared near-field microscopy to study the plasmonic properties of epitaxial quasi-free-standing monolayer graphene on silicon carbide. The near-field images reveal propagating graphene plasmons, as well as a strong plasmon reflection at gaps in the graphene layer, which…

Cappelluti E, Benfatto L, Manzardo M, Kuzmenko A.

Physical review. B, Condensed matter and materials physics. 2012;86(11):115439

Since their discovery, graphene-based systems represent an exceptional playground to explore the emergence of peculiar quantum effects. The present paper focuses on the anomalous appearance of strong infrared phonon resonances in the optical spectroscopy of bilayer graphene and on their pronounced…

Orlita M, Crassee I, Faugeras C, Kuzmenko A, Fromm F, Ostler M, Seyller T, Martinez G, Polini M, Potemski M.

New journal of physics. 2012;14(9):095008

We report on absolute magneto-transmission experiments on highly-doped quasi-free-standing epitaxial graphene targeting the classical-to-quantum crossover of the cyclotron resonance. This study allows us to directly extract the carrier density and also other relevant quantities such as the…

Levallois J, Tran M, Kuzmenko A.

Solid state communications. 2012;152(15):1294-1300

We measure the far-infrared magneto-optical Kerr rotation and reflectivity spectra of graphite and achieve a highly accurate unified microscopic description of all data in abroad range of magnetic fields by taking rigorously the c-axis band dispersion and the trigonal warping in to account. We find …

Manzardo M, Cappelluti E, Van Heumen E, Kuzmenko A.

Physical review. B,, Condensed matter and materials physics. 2012;86(5):054302

We study experimentally and theoretically the Fano-shaped phonon peak at 1590 cm−1(0.2 eV) in the in-plane optical conductivity of pristine graphite. We show that the anomalously large spectral weight and the Fano asymmetry of the peak can be qualitatively accounted for by a charged-phonon…

Ubrig N, Blake P, Van Der Marel D, Kuzmenko A.

Europhysics letters. 2012;100(5):58003

Crassee I, Orlita M, Potemski M, Walter AL, Ostler M, Seyller T, Gaponenko I, Chen J, Kuzmenko A.

Nano letters. 2012;12(5):2470-2474

We show that in graphene epitaxially grown on SiC the Drude absorption is transformed into a strong terahertz plasmonic peak due to natural nanoscale inhomogeneities, such as substrate terraces and wrinkles. The excitation of the plasmon modifies dramatically the magneto-optical response and in…

Gorbar EV, Gusynin VP, Kuzmenko A, Sharapov SG.

Physical review. B,, Condensed matter and materials physics. 2012;86(7):075414

We study the influence of different kinds of gaps in a quasiparticle spectrum on longitudinal and transverse optical conductivities of bilayer graphene. An exact analytical expression for magnetooptical conductivity is derived using a low-energy two-band Hamiltonian. We consider how the layer…

Thorsmølle VK, Homes CC, Gozar A, Blumberg G, van Mechelen JLM, Kuzmenko A, Vanishri S, Marin C, Rønnow HM.

Physical review letters. 2012;108(21):217401

The terahertz (THz) excitations in the quantum spin-ladder system Sr14Cu24O41 have been determined along the c axis using THz time-domain, Raman, and infrared spectroscopy. Low-frequency infrared and Raman active modes are observed above and below the charge-ordering temperature T(co) is…

Crassee I, Levallois J, Walter AL, Ostler M, Bostwick A, Rotenberg E, Seyller T, Van Der Marel D, Kuzmenko A.

Nature physics. 2011;7(1):48-51

The rotation of the polarization of light after passing a medium in a magnetic field, discovered by Faraday, is an optical analogue of the Hall effect, which combines sensitivity to the carrier type with access to a broad energy range. Up to now the thinnest structures showing the Faraday rotation…

Crassee I, Levallois J, Van Der Marel D, Walter A, Seyller T, Kuzmenko A.

Physical review. B, Condensed matter and materials physics. 2011;84(3):035103

Far-infrared diagonal and Hall conductivities of multilayer epitaxial graphene on the C face of SiC were measured using magneto-optical absorption and Faraday rotation in magnetic fields up to 7 T and temperatures between 5 and 300 K. Multiple components were identified in the spectra, including…

Hancock JN, van Mechelen JLM, Kuzmenko A, Van Der Marel D, Brüne C, Novik E, Astakhov G, Buhmann H, Molenkamp L.

Physical review letters. 2011;107(13):136803

We present a magneto-optical study of the three-dimensional topological insulator, strained HgTe, using a technique which capitalizes on advantages of time-domain spectroscopy to amplify the signal from the surface states. This measurement delivers valuable and precise information regarding the…

Klimin SA, Kuzmenko A, Popova MN, Malkin BZ, Telegina IV.

Physical review. B,, Condensed matter and materials physics. 2010;82(17):174425

We present infrared spectra of Gd2BaNiO5, which is isostructural to a prototype S=1 Haldane compound Y2BaNiO5 containing Ni2+ chains, in the spectral range 2 meV–0.55 eV. Unlike Y2BaNiO5, the studied compound contains magnetic rare-earth sublattices and orders antiferromagnetically at TN=58 K….

Van Heumen E, Huang Y, de Jong S, Kuzmenko A, Golden MS, Van Der Marel D.

Europhysics letters. 2010;90(3):37005

We present detailed temperature-dependent optical data on BaFe2- xCoxAs2 (BCFA), with x=0.14, between 4 meV and 6.5 eV. We analyze our spectra to determine the main optical parameters and show that in this material the interband conductivity already starts at energies as low as 10 meV. We…

Cappelluti E, Benfatto L, Kuzmenko A.

Physical review. B, Condensed matter and materials physics. 2010;82(4):041402

Recent infrared measurements of phonon peaks in gated bilayer graphene reveal two striking signatures of electron-phonon interaction: an asymmetric Fano lineshape and a giant variation in the peak intensity as a function of the applied gate voltage. In this Rapid Communication we provide a unified…

Kuzmenko A, Crassee I, Van Der Marel D, Blake P, Novoselov K.

Physical review. B, Condensed matter and materials physics. 2009;80(16):165406

Van Heumen E, Meevasana W, Kuzmenko A, Eisaki H, Van Der Marel D.

New journal of physics. 2009;11(5):055067

An experimental study of the in-plane optical conductivity of (Pbx,Bi2−x)(LaySr2−y)CuO6 (Bi2201) is presented for a broad doping and temperature range. The in-plane conductivity is analyzed within a strong coupling formalism. We address the interrelationship between the optical conductivity,…

Tediosi R, Carbone F, Kuzmenko A, Teyssier J, Van Der Marel D, Mydosh J.

Physical review. B, Condensed matter and materials physics. 2009;80(3):035107

Kuzmenko A, Benfatto L, Cappelluti E, Crassee I, Van Der Marel D, Blake P, Novoselov KS, Geim AK.

Physical review letters. 2009;103:116804

We observe a giant increase of the infrared intensity and a softening of the in-plane antisymmetric phonon mode Eu (∼0.2  eV) in bilayer graphene as a function of the gate-induced doping. The phonon peak has a pronounced Fano-like asymmetry. We suggest that the intensity growth and the…

Kuzmenko A, Van Heumen E, Van Der Marel D, Lerch P, Blake P, Novoselov KS, Geim AK.

Physical review. B, Condensed matter and materials physics. 2009;79(11):115441

We present infrared spectra (0.1–1 eV) of electrostatically gated bilayer graphene as a function of doping and compare it with tight-binding calculations. All major spectral features corresponding to the expected interband transitions are identified in the spectra: a strong peak due to…

Van Heumen E, Muhlethaler E, Kuzmenko A, Eisaki H, Meevasana W, Greven M, Van Der Marel D.

Physical review. B, Condensed matter and materials physics. 2009;79(18):184512

We take advantage of the connection between the free-carrier optical conductivity and the glue function in the normal state, to reconstruct from the infrared optical conductivity the glue spectrum of ten different high-Tc cuprates revealing a robust peak in the 50–60 meV range and a broad…

Van Heumen E, Kuzmenko A, Van Der Marel D.

Journal of physics. Conference series. 2009;150(5):052278

We analyze optical spectra of high temperature superconductors using a minimal model of electrons coupled to bosons. We consider the marginal Fermi liquid theory and the spin fluctuation theory, as well as a histogram representation of the bosonic spectral density. We find that the two theories can …

Marsiglio F, Van Heumen E, Kuzmenko A.

Physical review. B, Condensed matter and materials physics. 2008;77(14):144510

A single band optical sum rule derived by Kubo can reveal a novel kind of superconducting state. It relies, however, on a knowledge of the single band contribution from zero to infinite frequency. A number of experiments over the past five years have used this sum rule; their data has been…

Kuzmenko A, Van Heumen E, Carbone F, Van Der Marel D.

Physical review letters. 2008;100(11):117401

We find experimentally that the optical sheet conductance of graphite per graphene layer is very close to (π/2)e2/h, which is the theoretically expected value of dynamical conductance of isolated monolayer graphene. Our calculations within the Slonczewski-Weiss-McClure model explain well why the…

Kuzmenko A, Van Der Marel D, Carbone F, Marsiglio F.

New journal of physics. 2007;9(7):229-229

Partial sum rules are widely used in physics to separate low- and high-energy degrees of freedom of complex dynamical systems. Their application, though, is challenged in practice by the always finite spectrometer bandwidth and is often performed using risky model-dependent extrapolations. We show…

Kuzmenko A.

Physica. C, Superconductivity. 2007;456(1-2):63-74

A short review of the optical and far-infrared measurements on MgB2 is given. Multiband and multigap effects are analyzed by comparing optical properties with other experiments and {\em ab initio} calculations. The covered topics are: the plasma frequency, electron-phonon interaction, impurity…

Van Heumen E, Lortz R, Kuzmenko A, Carbone F, Van Der Marel D, Zhao X, Yu G, Cho Y, Barisic N, Greven M, Homes C, Dordevic S.

Physical review. B, Condensed matter and materials physics. 2007;75(5):054522

Norman M, Chubukov A, Van Heumen E, Kuzmenko A, Van Der Marel D.

Physical review. B, Condensed matter and materials physics. 2007;76(22):220509

Much attention has been given to a possible violation of the optical sum rule in the cuprates and the connection this might have to kinetic energy lowering. The optical integral is composed of a cutoff-independent term (whose temperature dependence is a measure of the sum-rule violation), plus a…

Burch K, Dordevic S, Mena F, Kuzmenko A, Van Der Marel D, Sarrao J, Jeffries J, Bauer E, Maple M, Basov D.

Physical review. B, Condensed matter and materials physics. 2007;75(5):054523

An analysis of the optical properties of heavy fermion compounds is reported. We focus on the 1-1-5 series, where strong deviations of the spectra are seen from the predictions of the periodic Anderson model. Specifically we demonstrate that the differences between the experimental results and the…

Teyssier J, Kuzmenko A, Van Der Marel D, Marsiglio F, Liashchenko A, Shitsevalova N, Filippov V.

Physical review. B, Condensed matter and materials physics. 2007;75(13):134503

We report the optical (6meV–4eV) properties of a boride superconductor ZrB12 (Tc=6K) in the normal state from 20to300K measured on high-quality single crystals by a combination of reflectivity and ellipsometry. The Drude plasma frequency and interband optical conductivity calculated by the…

Guritanu V, Kuzmenko A, Van Der Marel D, Kazakov S, Zhigadlo N, Karpinski J.

Physical review. B, Condensed matter and materials physics. 2006;73(10):104509

We present the anisotropic optical conductivity of MgB2 between 0.1 and 3.7eV at room temperature obtained on single crystals of different purity by spectroscopic ellipsometry and reflectance measurements. The bare (unscreened) plasma frequency ωp is almost isotropic and equal to 6.3eV, which…

Carbone F, Kuzmenko A, Molegraaf H, Van Heumen E, Lukovac V, Marsiglio F, Van Der Marel D, Haule K, Kotliar G, Berger H, Courjault S, Kes PH, Li M.

Physical review. B, Condensed matter and materials physics. 2006;74(6):064510

We present the ab-plane optical conductivity of four single crystals of Bi2Sr2CaCu2O8+δ(Bi2212) with different carrier doping levels from the strongly underdoped to the strongly overdoped range with Tc=66, 88, 77, and 67K, respectively. We focus on the redistribution of the low frequency optical…

Carbone F, Kuzmenko A, Molegraaf H, Van Heumen E, Giannini E, Van Der Marel D.

Physical review. B, Condensed matter and materials physics. 2006;74(2):024502

We examine the redistribution of the in-plane optical spectral weight in the normal and superconducting state in trilayer Bi2Sr2Ca2Cu3O10 (Bi2223) near optimal doping (Tc=110K) on a single crystal via infrared reflectivity and spectroscopic ellipsometry. We report the temperature dependence of the…

Marsiglio F, Carbone F, Kuzmenko A, Van Der Marel D.

Physical review. B, Condensed matter and materials physics. 2006;74(17):174516

The Kubo single-band sum rule is used to determine the optical spectral weight of a tight-binding band with farther than nearest-neighbor hopping. We find for a wide range of parameters and doping concentrations that the change due to superconductivity at low temperature can be either negative or…

Van Der Marel D, Carbone F, Kuzmenko A, Giannini E.

Annals of physics. 2006;321(7):1716-1729

Kuzmenko A.

Review of scientific instruments. 2005;76(8):083108

A universal method of extraction of the complex dielectric function ϵ(ω)=ϵ1(ω)+iϵ2(ω) from experimentally accessible optical quantities is developed. The central idea is that ϵ2(ω) is parameterized independently at each node of a properly chosen anchor frequency mesh, while ϵ1(ω) is…

Mena F, Kuzmenko A, Hadipour A, van Mechelen JLM, Van Der Marel D, Babushkina N.

Physical review. B, Condensed matter and materials physics. 2005;72(13):134422

Kuzmenko A, Molegraaf H, Carbone F, Van Der Marel D.

Physical review. B, Condensed matter and materials physics. 2005;72(14):144503

Kuzmenko A, Tombros N, Mena FP, Hadipour A, Molegraaf HJA, Van Der Marel D, Grüninger M, Uchida S.

Physica. C, Superconductivity. 2004;408-410:330-331

Optical transmission measurements provide a detailed picture of redistribution of the c-axis spectral weight of La2−xSrxCuO4 (x=0.12, 0.15) and allows to examine the Ferrell–Glover–Tinkham (FGT) sum rule up to 1.8 eV. A new conductivity peak is observed below Tc at ∼120 meV, which indicates …

Kuzmenko A, Tombros N, Molegraaf HJA, Grüninger M, Van Der Marel D, Uchida S.

Physical review letters. 2003;91(3):037004

We present the c -axis optical conductivity σ 1 c ( ω , T ) of underdoped ( x = 0.12 ) and optimally doped ( x = 0.15 ) L a 2 − x S r x C u O 4 from 4 meV to 1.8 eV obtained by a combination of reflectivity and transmission spectra. In addition to the opening of the superconducting gap, we…

Bush AA, Shkuratov VY, Kuzmenko A, Tishchenko EA.

Crystallography reports. 2002;47(2):335-339

Experiments on the growth of CuO single crystals by crystallization from flux in the CuO–Bi2O3– PbO–PbF2, CuO–Bi2O3–Li2O, CuO–Bi2O3–B2O3, CuO–BaO–Y2O3, and CuO–MOx systems (M = P, V, or Mo) have been performed. The best results were obtained in crystallization in the…

Kuzmenko A, Mena FP, Molegraaf HJA, Van Der Marel D, Gorshunov B, Dressel M, Mazin II, Kortus J, Dolgov OV, Muranaka T, Akimitsu J.

Solid state communications. 2002;121(9-10):479-484

The optical conductivity of MgB2 has been determined on a dense polycrystalline sample in the spectral range 6 meV–4.6 eV using a combination of ellipsometric and normal incidence reflectivity measurements. σ1(ω) features a narrow Drude peak with anomalously small plasma frequency (1.4 eV) and…

Mazin II, Andersen OK, Jepsen O, Dolgov OV, Kortus J, Golubov AA, Kuzmenko A, Van Der Marel D.

A large number of experimental facts and theoretical arguments favor a two-gap model for superconductivity in M g B 2 . However, this model predicts strong suppression of the critical temperature by interband impurity scattering and, presumably, a strong correlation between the critical temperature …

van der Eb JW, Kuzmenko A, Van Der Marel D.

Physical review letters. 2001;86(15):3407-3410

We determined the optical properties of α – and γ -phase Ce in the photon energy range from 60 meV to 2.5 eV using ellipsometry and grazing incidence reflectometry. We observe significant changes of the optical conductivity, the dynamical scattering rate, and the effective mass between α – and…

Gorshunov B, Kuntscher CA, Haas P, Dressel M, Mena FP, Kuzmenko A, Van Der Marel D, Muranaka T, Akimitsu J.

The European physical journal. B., Condensed matter physics. 2001;21(2):159-161

Far-infrared reflectivity studies on the polycrystalline intermetallic compound MgB_2 with a superconducting transition temperature T_c=39 K were performed at temperatures 20 K to 300 K. We observe a significant raise of the superconducting-to-normal state reflectivity ratio below 70 cm^{-1}, with…

Kuzmenko A, Van Der Marel D, van Bentum PJM, Tishchenko EA, Presura C, Bush AA.

Physica. B, Condensed matter. 2000;284-288:1396-1397

We report the \"rst measurements of FIR and MIR re#ectivity of single-crystal monoclinic antiferromagnetic copper monoxide (CuO) in a wide temperature range (7}300 K) when b-axis and ac-plane polarized modes are completely separated and excited in transverse geometry. Previously reported softening…

Kuzmenko A, Tishchenko EA, Krechetov AS.

Optics and spectroscopy. 1998;84:402-409.

An extension of the Kramers-Kronig method for treatment of polarized infrared reflectance spectra from the face of low-symmetry crystals, where directions of principal dielectric axes depend on frequency, is proposed. It is shown, how to obtain the frequency dependencies of the complex reflectivity …

Kuzmenko A, Tishchenko EA, Sashin IL, Khlopkin MN, Orlov VG.

Journal of low temperature physics. 1996;105(3-4):861-866

Studies on the lattice dynamics of ct-Bi203 have been performed including IR polarized reflectance spectra on single crystal, inelastic neutron scattering and specific heat measurements. Dispersion parameters and polarizations of IRactive phonons are presented and compared with neutron and specific …

Kuzmenko A, Tishchenko EA, Ivlev AN, Orlov VG.

Czechoslovak Journal of Physics. 1996;46(S5):2665-2666

Polarized IR reflectance spectra of monoclinic single crystal ~-Bi20 ~ for different directions of the wave vector k and the electric field E of the incident radiation have been measured in a wide temperature range (25-400 K). A significant dependence of the spectrum shape on the direction of the…

Kuzmenko A, Tishchenko EA, Orlov VG.

Journal of physics. Condensed matter. 1996;8(34):6199-6212

Measurements of infrared polarized reflectance spectra of single-crystal α-Bi2O3 have been made at room temperature in the wavelength range from 30 to 4000 cm−1 for different orientations of the wave vector k and the electric field E of the incident radiation relative to the crystallographic…

Crassee I.

In this thesis we experimentally study the infrared magneto-optical properties of single and multilayer epitaxial graphene grown on a SiC substrate. Which is a promising material due to the scalability of the production method. However, graphene grown on SiC is also very complex, due to grain…