Spin Splitting in GaAs (100) Two-Dimensional Holes
B. Habib, E. Tutuc, S. Melinte, M. Shayegan, D. Wasserman, S. A. Lyon, R. Winkler
Abstract
We measured Shubnikov-de Haas (SdH) oscillations in GaAs (100) two-dimensional holes to determine the inversion asymmetry-induced spin splitting. The Fourier spectrum of the SdH oscillations contains two peaks, at frequencies
f
−
and
f
+
, that correspond to the hole densities of the two spin subbands and a peak, at frequency
f
tot
, corresponding to the total hole density. In addition, the spectrum exhibits an anomalous peak at
f
tot
/2
. We also determined the effective masses of the two spin subbands by finding the inverse transform of the Fourier spectrum in the vicinity of
f
−
and
f
+
, and then analyzing the temperature dependence of the SdH oscillations for each subband. We discuss our results in light of self-consistent calculations and previous experiments.