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APS » Journals » Phys. Rev. Lett. » Volume 86 » Issue 16
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Phys. Rev. Lett. 86, 3614–3617 (2001)

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

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M. A. Zudov*, I. V. Ponomarev, A. L. Efros, and R. R. Du
Department of Physics, University of Utah, Salt Lake City, Utah 84112

J. A. Simmons and J. L. Reno
Sandia National Laboratories, Albuquerque, New Mexico 87185

Received 2 May 2000; published in the issue dated 16 April 2001

We report on a new class of magnetoresistance oscillations observed in a high-mobility two-dimensional electron gas (2DEG) in GaAs-AlxGa1-xAs heterostructures. Appearing in a weak magnetic field ( B<0.3T) and only in a narrow temperature range ( 2K<T<9K), these oscillations are periodic in 1/B with a frequency proportional to the electron Fermi wave vector, kF. We interpret the effect as a magnetophonon resonance of the 2DEG with leaky interface-acoustic phonon modes carrying a wave vector q = 2kF. 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.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.3614
DOI:
10.1103/PhysRevLett.86.3614
PACS:
73.50.Rb, 68.35.Ja, 73.50.-h

*Present address: Stanford Picosecond Free Electron Laser Center, Stanford University, Stanford, CA 94305.

 
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