Linear and quadratic Zeeman effect of excitons bound to neutral acceptors in GaSb

Abstract

The linear and quadratic Zeeman effect of four different excitonic recombination lines at 805.4, 803.4, 800.1, and 796.1 meV are investigated. The decay of excitons bound to neutral acceptors ($A^0,X$) is responsible for these lines. The angular momentum $J$ of the ($A^0,X$) ground state is in at least three cases 1/2 and not 3/2 or 5/2. The sixfold linear Zeeman splitting of the different lines is dominated by the same large value $g_{\mathrm{eff}}=-8.95\mathrm{}\pm 0.15$ of the initial state of the transition. It is shown that the average diamagnetic shift of a deep ($A^0,X$) complex is described satisfactorily by Larsen's theory of a donor in a magnetic field. These findings suggest that the ($A^0,X$) bound exciton may be described by a donorlike $A^{+}$ center binding an electron. From the splitting of the final states (neutral acceptors), the $g$ values of the bound holes are determined to be $K=0.14-0.25\mathrm{}$ for the different acceptors. A recently predicted diamagnetic splitting $\Delta$ of the acceptor states having $\left|m_j\right|=\frac{1}{2} \mathrm{and} \frac{3}{2}$ is observed.