New Class of Magnetoresistance Oscillations: Interaction of a Two-Dimensional Electron Gas with Leaky Interface Phonons
We report on a new class of magnetoresistance oscillations observed in a high-mobility two-dimensional electron gas (2DEG) in GaAs-Al{sub x}Ga{sub 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 1/B with a frequency proportional to the electron Fermi wave vector, k{sub F}. We interpret the effect as a magnetophonon resonance of the 2DEG with leaky interface-acoustic phonon modes carrying a wave vector q=2k{sub F}. Calculations show a few branches of such modes existing on the GaAs-Al{sub x}Ga{sub 1-x}As interface, and their velocities are in quantitative agreement with the observation.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40205756
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 86; ISSN 0031-9007
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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