A. B. Kuzmenko

Universal optical conductance of graphite.

We find experimentally that the optical sheet conductance of graphite per graphene layer is very close to (pi/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 interplane hopping leaves the conductance of graphene sheets in graphite almost unchanged for photon energies between 0.1 and 0.6 eV, even though it significantly affects the band structure on the same energy scale. The f-sum rule analysis shows that the large increase of the Drude spectral weight as a function of temperature is at the expense of the removed low-energy optical spectral weight of transitions between hole and electron bands.

Giant Faraday rotation in single- and multilayer graphene

The rotation of polarized light in certain materials when subject to a magnetic field is known as the Faraday effect. Remarkably, just one atomic layer of graphene exhibits Faraday rotations that would only be measurable in other materials many hundreds of micrometres thick.

Kramers–Kronig constrained variational analysis of optical spectra

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 dynamically coupled to ϵ2(ω) by the Kramers–Kronig (KK) transformation. This approach can be regarded as a limiting case of the multioscillator fitting of spectra, when the number of oscillators is on the order of the number of experimental points. In the case of the normal-incidence reflectivity from a semi-infinite isotropic sample the new method gives essentially the same result as the conventional KK transformation of reflectivity. In contrast to the conventional approaches, the proposed technique is applicable, without readaptation, to virtually all types of linear-response optical measurements, or arbitrary combinations of measurements, such as reflectivity, transmission, ellipsometry, etc., done on different types of sa...A universal method of extraction of the complex dielectric function

Mono- and Bilayer WS2 Light-Emitting Transistors

\epsilon(\omega)=\epsilon_{1}(\omega)+i\epsilon_{2}(\omega)

Intrinsic Terahertz Plasmons and Magnetoplasmons in Large Scale Monolayer Graphene

from experimentally accessible optical quantities is developed. The central idea is that

Determination of the gate-tunable band gap and tight-binding parameters in bilayer graphene using infrared spectroscopy

\epsilon_{2}(\omega)

Electron-phonon interaction and charge carrier mass enhancement in SrTiO3

is parameterized independently at each node of a properly chosen anchor frequency mesh, while

Infrared spectroscopic study of CuO: Signatures of strong spin-phonon interaction and structural distortion

\epsilon_{1}(\omega)

Surface transport and band gap structure of exfoliated 2H-MoTe2 crystals

is dynamically coupled to

Strong Plasmon Reflection at Nanometer-Size Gaps in Monolayer Graphene on SiC

\epsilon_{2}(\omega)