Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 36: Heterostructures

HL 36.8: Vortrag

Donnerstag, 29. März 2007, 11:45–12:00, H14

Two-dimensional electron systems under microwave irradiation: Influence of contacts. — •Sergey Mikhailov¹ and Akira Satou² — ¹Institute for Theoretical Physics II, University of Augsburg, D-86135 Augsburg, Germany — ²Computer Solid State Physics Laboratory, University of Aizu, Aizu-Wakamatsu 965-8580, Japan

A growing interest to the behavior of two-dimensional (2D) electron systems under the microwave irradiation was being observed in the few past years. A number of recently discovered phenomena, such as the retardation effects, the microwave induced zero resistance states, frequency sensitive detection and spectroscopy of microwave radiation, have attracted attention due to their importance for basic and applied physics.

At low (microwave) frequencies the influence of realistic dielectric environment, in particular, the presence of metallic contacts, may be crucially important. In this work we theoretically study the role of contacts in the excitation of plasma waves in 2D electron systems. We show that, dependent on parameters of the system, the energy of the incident radiation may be effectively transformed into the 2D plasmons or 2D plasmon-polaritons, or reflected back from the 2D layer without exciting any eigen modes of the system. Results of this work may be important for proper understanding of the recently observed microwave induced phenomena in 2D electron systems.