Abstract-Calculation of terahertz conductivity spectra in semiconductors with nanoscale modulation

http://prb.aps.org/abstract/PRB/v86/i7/e075308

Jan Mrozek and Hynek Němec^* 
Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic

Received 26 April 2012; published 14 August 2012

Monte Carlo simulations are employed to calculate terahertz conductivity of charge carriers in a potential with periodic modulation on the nanoscale. The modulation gives rise to two characteristic features in the conductivity spectra: a Drude peak owing to charge carriers with kinetic energy exceeding the modulation depth, and resonance due to charge carriers localized around potential minima. Both peaks shift in an applied magnetic field. We discuss the relationship between the modulation potential and the positions and strengths of the resonances. We also analyze the role of depolarization fields which are responsible for the difference between local and effective conductivity.

©2012 American Physical Society

URL:

http://link.aps.org/doi/10.1103/PhysRevB.86.075308

DOI:

10.1103/PhysRevB.86.075308

PACS:

73.63.-b, 78.67.-n

^*nemec@fzu.cz