Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 52: Hauptvortrag Mirlin

HL 52.1: Hauptvortrag

Dienstag, 8. März 2005, 14:15–15:00, TU P270

2D electron gas under microwaves: Theory of oscillatory photoresistivity and zero-resistance states — •A.D. Mirlin^1,2, I.A. Dmitriev¹, M.G. Vavilov³, I.L. Aleiner⁴, and D.G. Polyakov¹ — ¹Inst. fuer Nanotechnologie, Forschungszentrum Karlsruhe, 76021 Karlsruhe — ²Inst. fuer Theorie der kondensierten Materie, Universitaet Karlsruhe, 76128 Karlsruhe — ³Dept. of Applied Physics, Yale University, New Haven, CT 06520, USA — ⁴Physics Dept., Columbia University, New York, NY 10027, USA

Recent experiments have discovered that the resistivity of a 2D electron gas subjected to microwave radiation exhibits striking magnetooscillations and that at sufficiently high microwave power regions of zero resistance develop. We review the theory of this spectacular phenomena. Considering different mechanisms, we show that leading contribution is due to the effect of the microwaves on the electron distribution function. We analyze the spontaneous formation of the zero-resistance domains, as well as inelastic relaxation due to electron-electron collisions governing the temperature dependence of the effect. We further predict that the above mechanism induces also strong magnetooscillations of the local compressibility. The compressibility measurements should provide information about the domain structure of zero-resistance states. Finally, open questions are discussed.