
TY  - JOUR
A1  - Zhang, C. 
T1  - Electromagnetic Absorption in Two-dimensional Systems under a Magnetic Field and a Unidirectional Periodic Potential
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 2000
VL  - 53
IS  - 1
SP  - 65
EP  - 76
KW  - 
UR  - https://doi.org/10.1071/PH99024 
N2  - The absorption of electromagnetic waves by a high mobility two-dimensional electron gas subjected to a magnetic field and a weak periodic potential is investigated. We show that the periodic modulation on the Laudau states has a profound effect on the absorption of electromagnetic waves. We develop a formalism which treats the electron&#8211;electron interaction beyond the random-phase-approximation (RPA) and includes the electron-impurity scattering in the lowest order. A RPA dielectric function was employed to study the electromagnetic absorption in modulated systems. Simultaneous excitation of an electron&#8211;hole pair with finite momentum contributes significantly to the absorption around and below the cyclotron frequency. Such a process is absent for a uniform electron gas under a magnetic field. 
ER  -

