New Class of Magnetoresistance Oscillations: Interaction of a Two-Dimensional Electron Gas with Leaky Interface Phonons

Abstract

We report on a new class of magnetoresistance oscillations observed in a high-mobility two-dimensional electron gas (2DEG) in GaAs-Al(x)Ga(1)(-x) AS heterostructures. Appearing in a weak magnetic field (B < 0.3 T) and only in a narrow temperature range (2 K < T < 9 K) these oscillations are periodic in I/B with a frequency proportional to the electron Fermi wave vector, kp. We interpret the effect as a magnetophonon resonance of the 2DEG with thermally excited leaky interface-acoustic phonons. Calculations show a few branches of such modes existing on the GaAs- AL(x)Ga(1-x)As interface and their velocities are in quantitative agreement with the observation. We show that electrons mostly interact with the phonons carrying a wave vector q 2kp.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2001
Accession Number
ADP013274

Entities

People

  • A. L. Efros
  • I. V. Ponomarev
  • J. A. Simmons
  • M. A. Zudov
  • R. R. Du

Organizations

  • University of Utah

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms

DTIC Thesaurus Topics

  • Crystal Lattice Vibrations
  • Electron Density
  • Electron Gas
  • Electron Mobility
  • Electron Transfer
  • Electrons
  • Frequency
  • Magnetic Fields
  • Magnetoresistance
  • Materials
  • Mobility
  • Nanostructures
  • Oscillation
  • Phonons
  • Resonance
  • Two Dimensional
  • Waves

Fields of Study

  • Physics

Readers

  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.
  • Semiconductor Device Technology

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene