Giant spin-orbit splitting in a HgTe quantum well
Y. S. Gui, C. R. Becker, N. Dai, J. Liu, Z. J. Qiu, E. G. Novik, M. Schaefer, X. Z. Shu, J. H. Chu, H. Buhmann, L. W. Molenkamp
Abstract
We have investigated beating patterns in Shubnikov-de Haas oscillations for HgTe/Hg0.3Cd0.7Te(001) quantum wells with electron densities of 2 to 3 X 1012 cm-2. Up to 12 beating nodes have been observed at magnetic fields between 0.9 and 6 T. Zero magnetic field spin-orbit splitting energies up to 30 meV have been directly determined from the node positions as well as from the intersection of self-consistently calculated Landau levels. These values, which exceed the thermal broadening of Landau levels, kB T, at room temperature, are in good agreement with Rashba spin-orbit splitting energies calculated by means of an 8 X 8 kp Kane model. The experimental Shubnikov-de Haas oscillations are also in good agreement with numerical simulations based on this model.
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