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Title: 2k{sub F}-selected conductance oscillations of high-mobility two-dimensional electron gas in Corbino devices

We have observed electrical-field induced magneto-conductivity oscillations measured in Corbino samples made of a GaAs high-mobility two-dimensional electron gas, and found a consistent interpretation based on a semiclassical model of 2k{sub F}-selected orbital transitions between N and Nā€‰+ā€‰1, 2, 3,ā€¦, Landau levels at respective local potentials, where k{sub F} is the Fermi wavevector. From the oscillation period, we deduce an effective mass value, which is consistent with the bare electron band mass of GaAs. In the same devices but with a vanishing electrical field and at elevated temperatures, we observed additional oscillation features, which can be attributed to cyclotron resonance by population of acoustic phonons. We thus demonstrate a method to determine the carrier effective mass and the sound velocity of host crystals by standard electrical transport.
Authors:
 [1] ;  [2] ; ; ;  [3] ;  [2] ;  [4] ; ;  [5] ;  [1] ;  [2] ;  [6]
  1. International Center for Quantum Materials, School of Physics, Peking University, 100871, Beijing (China)
  2. (China)
  3. Collaborative Innovation Center of Quantum Matter, 100871, Beijing (China)
  4. Rice University, Houston, Texas 77251-1892 (United States)
  5. Princeton University, Princeton, New Jersey 08544 (United States)
  6. (United States)
Publication Date:
OSTI Identifier:
22391907
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 18; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CRYSTALS; CYCLOTRON RESONANCE; EFFECTIVE MASS; ELECTRON GAS; ELECTRON MOBILITY; GALLIUM ARSENIDES; OSCILLATIONS; PHONONS; SEMICLASSICAL APPROXIMATION