Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 42, Issue 4, Pages 1159-1162Publisher
ELSEVIER
DOI: 10.1016/j.physe.2009.11.043
Keywords
Two-dimensional electron gas; Microwave-induced resistance oscillations; Non-equilibrium magneto-oscillations; Einstein relation
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Recent experiment [S.I. Dorozhkin Cl al., Phys. Rev. Lett. 102 (2009) 036602] on quantum Hall structures with strongly asymmetric contact configuration discovered microwave-induced photocurrent and photovoltage magnetooscillations in the absence of dc driving. We show that in an irradiated sample the Landau quantization leads to violation of the Einstein relation between the dc conductivity and diffusion coefficient. Then, in the presence of a built-in electric field in a sample, the microwave illumination causes photo-galvanic signals which oscillate as a function of magnetic field with the period determined by the ratio of the microwave frequency to the cyclotron frequency, as observed in the experiment. (c) 2009 Elsevier B.V. All rights reserved.
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