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Title: Contactless measurement of alternating current conductance in quantum Hall structures

We report a procedure to determine the frequency-dependent conductance of quantum Hall structures in a broad frequency domain. The procedure is based on the combination of two known probeless methods—acoustic spectroscopy and microwave spectroscopy. By using the acoustic spectroscopy, we study the low-frequency attenuation and phase shift of a surface acoustic wave in a piezoelectric crystal in the vicinity of the electron (hole) layer. The electronic contribution is resolved using its dependence on a transverse magnetic field. At high frequencies, we study the attenuation of an electromagnetic wave in a coplanar waveguide. To quantitatively calibrate these data, we use the fact that in the quantum-Hall-effect regime the conductance at the maxima of its magnetic field dependence is determined by extended states. Therefore, it should be frequency independent in a broad frequency domain. The procedure is verified by studies of a well-characterized p-SiGe/Ge/SiGe heterostructure.
Authors:
; ; ; ; ;  [1] ;  [2] ;  [3] ; ;  [4]
  1. A. F. Ioffe Physical-Technical Institute of the Russian Academy of Sciences, 194021 St. Petersburg (Russian Federation)
  2. Department of Physics, University of Oslo, P.O. Box 1048 Blindern, 0316 Oslo (Norway)
  3. (Russian Federation)
  4. Laboratorium für Festkörperphysik ETH Zürich, CH-8093 Zürich (Switzerland)
Publication Date:
OSTI Identifier:
22305843
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALTERNATING CURRENT; CRYSTALS; FREQUENCY DEPENDENCE; GERMANIUM; GERMANIUM SILICIDES; LAYERS; MAGNETIC FIELDS; MICROWAVE RADIATION; PHASE SHIFT; PIEZOELECTRICITY; SOUND WAVES; SPECTROSCOPY; SURFACES; WAVEGUIDES