Zeeman splitting of the conduction band of HgTe quantum wells with a semimetallic spectrum

Abstract

Shubnikov–de Haas oscillations in Hg1-xCdx Te/HgTe/Hg1-xCdxTe structures with the widths of a well of 16 and 20 nm have been investigated in tilted magnetic fields. The spin-to-orbital splitting ratio in the conduction band has been found in a wide range of electron densities. The magnitude and density dependence of the ratio agree fairly well with the calculations of the spectrum in the 8-band kP model. It has been shown that the effective g factor is anisotropic, g|| < g┴. The anisotropy is very high at low densities but decreases rapidly with an increase in the density, approaching unity at ne = (3−4) × 1011 cm-2.