Open AccessMicrowave induced negative resistance states in 2D electron gas with periodic modulation
Author(s) -
Torres Manuel,
Kunold Alejandro
Publication year - 2007
Publication title -
physica status solidi c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 46
eISSN - 1610-1642
pISSN - 1862-6351
DOI - 10.1002/pssc.200673339
Subject(s) - microwave , condensed matter physics , heterojunction , fermi gas , electron , modulation (music) , magnetic field , lattice (music) , landau quantization , physics , chemistry , materials science , quantum mechanics , acoustics
We study the microwave‐induced photoconductivity of a two‐dimensional electron system (2DES) in the presence of a magnetic field and a two‐dimensional modulation. The microwave and Landau contributions are exactly taken into account, while the periodic potential is treated perturbatively. The longitudinal resistivity exhibits oscillations, periodic in ω / ω c . Negative resistance states (NRS) develop for sufficiently high electron mobility and microwave power. This phenomenon appears in a narrow window region of values of the lattice parameter ( a ), around a ∼ l B , where l B is the magnetic length. It is proposed that these phenomena may be observed in artificially fabricated arrays of periodic scatterers at the interface of ultraclean heterostructures. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)