Accession Number:

ADP013274

Title:

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

Descriptive Note:

Conference proceedings

Corporate Author:

UTAH UNIV SALT LAKE CITY DEPT OF PHYSICS

Report Date:

2001-06-01

Pagination or Media Count:

4.0

Abstract:

We report on a new class of magnetoresistance oscillations observed in a high-mobility two-dimensional electron gas 2DEG in GaAs-AlxGa1-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 IB 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- ALxGa1-xAs 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.

Subject Categories:

  • Electricity and Magnetism
  • Atomic and Molecular Physics and Spectroscopy
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE