Giant spin-orbit splitting in a HgTe quantum well -: art. no. 115328

We have investigated beating patterns in Shubnikov-de Haas oscillations for HgTe/Hg0.3Cd0.7Te(001) quantum wells with electron densities of 2-3x10(12) 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, k(B)T, at room temperature, are in good agreement with Rashba spin-orbit splitting energies calculated by means of an 8x8 k.p Kane model. The experimental Shubnikov-de Haas oscillations are also in good agreement with numerical simulations based on this model.