Oscillatory magnetothermopower and resonant phonon drag in a high-mobility 2D electron gas.
Experimental and theoretical evidence is presented for new low-magnetic-field (B<5 kG) 1/B oscillations in the thermoelectric power of a high-mobility GaAs/AlGaAs two-dimensional (2D) electron gas. The oscillations result from inter-Landau-level resonances of acoustic phonons carrying a momentum equal to twice the Fermi wave number at B=0. Numerical calculations show that both 3D and 2D phonons can contribute to this effect.
Zhang
Jian
J
Department of Physics, University of Utah, Salt Lake City, Utah 84112, USA.
Lyo
S K
SK
Du
R R
RR
Simmons
J A
JA
Reno
J L
JL