Reflectance of Dirac electrons in organic conductor

International Workshop on Dirac Electrons in Solids 2015

Suzumura, Yoshikazu^1 ; Proskurin, Igor^2,3 ; Ogata, Masao^2

Department of Physics, Nagoya University, Nagoya

464-8602, Japan^1

Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo

113-0033, Japan^2

Department of Theoretical Physics, Institute of Natural Sciences, Ural Federal University, Mira 19, Ekaterinburg

620002, Russia^3

关键词: BEDT-TTF;    Complex dielectric constant;    Constant damping;    Dirac electrons;    Inter-band excitations;    Interlayer distance;    Two dimensional plane;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/603/1/012011/pdf
DOI  :  10.1088/1742-6596/603/1/012011

来源: IOP

【 摘 要 】

We examine the reflectance R of Dirac electrons of organic conductor α-(BEDT- TTF)2I3with a tilted cone which is characterized by a degree of the tilting η(= 0.8) and the angle a measured from the applied electric field. The reflectance is calculated using the complex dielectric constant, Ε1+ iΕ2, which is evaluated from the in-plane dynamical conductivity with a constant damping Γ. The bulk reflectance on the two-dimensional plane is estimated by taking account of an interlayer distance of organic conductor α-(BEDT-TTF)2I3. We compare a difference of R between α = 0(i) and π/2 (ii), which correspond to the tilting being parallel and perpendicular to the electric field, respectively. The frequency ω dependence of R is examined for several magnitudes of the chemical potential μ to find a crossover from the zero doping to a finite doping. With increasing ω, R decreases from unity. For the small doping with μ