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
Personal Author(s):
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.
Descriptors:
Subject Categories:
- Electricity and Magnetism
- Atomic and Molecular Physics and Spectroscopy
- Solid State Physics