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

Journal Article · Mon Apr 16 00:00:00 EDT 2001 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.86.3614· OSTI ID:40205756

Zudov, M A; Ponomarev, I V; Efros, A L; Du, R R; Simmons, J A; Reno, J L

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, Vol. 86, Issue 16; Other Information: DOI: 10.1103/PhysRevLett.86.3614; Othernumber: PRLTAO000086000016003614000001; 017116PRL; PBD: 16 Apr 2001; ISSN 0031-9007
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELECTRON GAS
ELECTRONS
MAGNETIC FIELDS
MAGNETORESISTANCE
OSCILLATIONS
PHONONS
RESONANCE
VECTORS