Infrared spectroscopy of electronic bands in bilayer graphene (2008)
Kuzmenko, A. B., Van Heumen, E., Lerch, P., Blake, P., Novoselov, K. S., ...
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...
Van Heumen, E., Muhlethaler, E., Kuzmenko, A. B., Eisaki, H., Greven, M., ...
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...
Far-infrared probe of superconductivity in SmO$_{1-x}$F$_{x}$FeAs} (2008)
Mirzaei, S. I., Guritanu, V., Kuzmenko, A. B., Senatore, C., Wu, G., ...
We report far-infrared reflectance measurements on polycrystalline superconducting samples of SmO$_{1-x}$F$_{x}$FeAs ($x$ = 0.12, 0.15 and 0.2). We clearly observe superconductivity induced changes...
Electron-phonon interaction and charge carrier mass enhancement in SrTiO3 (2007)
Grimaldi, C., Kuzmenko, A. B., Armitage, N. P., Reyren, N., ...
We report a comprehensive THz, infrared and optical study of Nb doped SrTiO3 as well as DC conductivity and Hall effect measurements. Our THz spectra at 7K show the presence of a very narrow (
Universal dynamical conductance in graphite (2007)
Kuzmenko, A. B., Van Heumen, E., Carbone, F.
We find experimentally that the optical sheet conductance of graphite per graphene layer is very close to $(\pi/2)e^2/h$, which is the theoretically expected value of dynamical conductance of...
Impact of a finite cut-off for the optical sum rule in the superconducting state (2007)
Marsiglio, F., Van Heumen, E., Kuzmenko, A. B.
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...
Optical Integral in the Cuprates and the Question of Sum Rule Violation (2007)
Norman, M. R., Chubukov, A. V., Van Heumen, E., Kuzmenko, A. B.
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...
Multiband and impurity effects in infrared and optical spectra of MgB2 (2007)
A short review of the optical and far-infrared measurements on MgB$_{2}$ is given. Multiband and multigap effects are analyzed by comparing optical properties with other experiments and {\em ab...
Model-Independent Sum Rule Analysis Based on Limited-Range Spectral Data (2007)
Kuzmenko, A. B., Carbone, F., Marsiglio, F.
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...
Optical and thermodynamic properties of the high-temperature superconductor HgBa_2CuO_4+delta (2006)
Van Heumen, E., Lortz, R., Kuzmenko, A. B., Carbone, F., Zhao, X., ...
In- and out-of-plane optical spectra and specific heat measurements for the single layer cuprate superconductor Hg-1201 at optimal doping (Tc = 97 K) are presented. Both the in-plane and out-of-plane...
Optical properties and electronic structure of ZrB$_{12}$ (2006)
Teyssier, J., Kuzmenko, A. B., Marsiglio, F., Liashchenko, A. B., Filippov, V., ...
We report optical (6 meV - 4 eV) properties of a boride superconductor ZrB$_{12}$ ($T_c$ = 6 K) in the normal state from 20 to 300 K measured on high-quality single crystals by a combination of...
Carbone, F., Kuzmenko, A. B., Molegraaf, H. J. A., Van Heumen, E., Lukovac, V., Marsiglio, F., ...
We present the ab-plane optical conductivity of four single crystals of Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ (Bi2212) with different carrier doping levels from the strongly underdoped to the...
Scaling properties of the optical conductivity of Bi-based cuprates (2006)
Carbone, F., Kuzmenko, A. B., Giannini, E.
We present novel infrared optical conductivity data on the three layer high Tc superconductor Bi2Sr2Ca2Cu3O10 at optimal doping. We extend the analysis of an earlier publication, providing a...
Carbone, F., Kuzmenko, A. B., Molegraaf, H. J. A., Van Heumen, E., Giannini, E.
We examine the redistribution of the in-plane optical spectral weight in the normal and superconducting state in tri-layer \bbb (Bi2223) near optimal doping ($T_c$ = 110 K) on a single crystal via...
Mena, F. P., Kuzmenko, A. B., Hadipour, A., Babushkina, N. A.
The optical conductivities of films of (La$_{0.5}$Pr$_{0.5}$)$_{0.7}$Ca$_{0.3}$MnO$_3$ with different oxygen isotopes ($^{16}$O and $^{18}$O) have been determined in the spectral range from 0.3 to...
Guritanu, V., Kuzmenko, A. B., Kazakov, S. M., Zhigadlo, N. D., Karpinski, J.
We present the anisotropic optical conductivity of MgB$_{2}$ between 0.1 and 3.7 eV at room temperature obtained on single crystals of different purity by the spectroscopic ellipsometry and...
Kuzmenko, A. B., Molegraaf, H. J. A., Carbone, F.
We present a detailed analysis of the superconductivity-induced redistribution of optical spectral weight in Bi2Sr2CaCu2O8 near optimal doping. It confirms the previous conclusion by Molegraaf et al....
Kramers-Kronig constrained variational analysis of optical spectra (2005)
A universal method of extraction of the complex dielectric function $\epsilon(\omega)=\epsilon_{1}(\omega)+i\epsilon_{2}(\omega)$ from experimentally accessible optical quantities is developed. The...
The c-axis optical sum rule and possible new collective mode in LSCO (2003)
Kuzmenko, A. B., Tombros, N., Molegraaf, H. J. A., Grueninger, M., Uchida, S.
We present the c-axis optical conductivity $\sigma_{1c}(\omega, T)$ of underdoped ($x$ = 0.12) and optimally doped ($x$ = 0.15) LSCO from 4 meV to 1.8 eV obtained by a combination of reflectivity and...