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

Abstract

Shubnikov–de Haas oscillations in Hg_1-xCd_x Te/HgTe/Hg_1-xCd_xTe 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 n_e = (3−4) × 10¹¹ cm^-2.