Interferometric detection of edge magnetoplasmons in AlGaAs/GaAs heterostructures

• Published in: Physica status solidi. C Vol. 8; no. 2; pp. 381 - 383
• Main Authors: Hashisaka, Masayuki, Washio, Kazuhisa, Kamata, Hiroshi, Muraki, Koji, Fujisawa, Toshimasa
• Format: Journal Article
• Language: English
• Published: Berlin WILEY-VCH Verlag 01.02.2011; WILEY‐VCH Verlag
• Subjects: 2D electron gas system; Aluminum gallium arsenides; Amplitudes; edge magnetoplasmons; edge state; Electrodes; Gallium arsenide; Gallium arsenides; Propagation; quantum Hall state; Reproduction; Tuning
• ISSN: 1862-6351; 1610-1642; 1610-1642
• DOI: 10.1002/pssc.201000477

We propose and demonstrate an interferometric detection scheme for edge magnetoplasmons (EMPs) propagating in two dimensional electron gas systems. Analogous to homodyne detection of electromagnetic wave in quantum optics, we apply reference microwaves to interfere with EMPs. Tuning the delay time, hence the phase, of the reference wave and analyzing the interference signal allow us to extract the amplitude and the phase of the original EMP at the detection point. The magnetic field dependence of the amplitude and the group velocity of EMPs are investigated by the detection scheme. This detection scheme is performed with a gate electrode as well as an Ohmic contact, which will be useful in evaluating spatial distribution of EMPs (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)