Acoustic magnetoplasmons in a two-dimensional electron system with a smooth edge

作者：Andreev I V^*; Muravev V M; Smetnev D V; Kukushkin I V

来源：Physical Review B, 2012, 86(12): 125315.

DOI：10.1103/PhysRevB.86.125315

Acoustic edge magnetoplasmon (AEMP) modes are detected in a wide range of magnetic fields by the resonant microwave absorption technique. It is established that in the case of a smooth edge of a two-dimensional electron system, the resonant signal is strongly enhanced with the AEMP excitation, whereas in the case of an abrupt edge, these modes are strongly damped. One fundamental mode and three AEMP modes are observed, and it is shown that the number of AEMP modes is directly related to the filling factor value. As a result, a sequence of abrupt terminations of AEMP modes is observed at the integer filling factors, in accordance with the number of edge compressible strips available in the electron system. Also the dependence of the relative AEMP amplitude versus the filling factor is addressed.

• 出版日期2012-9-19