We present a study of magnetooptical absorption by holes in zinc-blende semiconductors. We focus on transitions which, in the absence of the parity-violating Kane term in the Hamiltonian, are electric-dipole forbidden. These become allowed by virtue of mixing of states of different parity by the linear-k contribution to the effective Hamiltonian. The intensity of the resulting absorption is proportional to the square of the strength C of the Kane term. In addition to the electric-dipole transitions there are electric-quadrupole and magnetic-dipole transitions. Under certain conditions, in the Voigt geometrical arrangements, the matrix elements of the electric-dipole, the electric-quadrupole, and the magnetic-dipole moments give contributions to particular excitations and interference may result. The inversion-asymmetry contribution changes sign as the external magnetic field B0 is reversed while the electric-quadrupole and magnetic-dipole matrix elements change sign upon reversal of the incident photon momentum q. Thus, the interference may be made constructive or destructive by reversal of either B0 or q. We propose magnetooptical experiments which would allow the determination of both the magnitude and sign of C by measuring the change in the magnetooptic absorption upon reversal of B0. We give criteria for the existence of the interference and discuss application to InSb, GaSb, and HgTe.
INVERSION ASYMMETRY AND HOLE MAGNETO-OPTICS IN ZINCBLENDE SEMICONDUCTORS
LA ROCCA, Giuseppe Carlo;
1988
Abstract
We present a study of magnetooptical absorption by holes in zinc-blende semiconductors. We focus on transitions which, in the absence of the parity-violating Kane term in the Hamiltonian, are electric-dipole forbidden. These become allowed by virtue of mixing of states of different parity by the linear-k contribution to the effective Hamiltonian. The intensity of the resulting absorption is proportional to the square of the strength C of the Kane term. In addition to the electric-dipole transitions there are electric-quadrupole and magnetic-dipole transitions. Under certain conditions, in the Voigt geometrical arrangements, the matrix elements of the electric-dipole, the electric-quadrupole, and the magnetic-dipole moments give contributions to particular excitations and interference may result. The inversion-asymmetry contribution changes sign as the external magnetic field B0 is reversed while the electric-quadrupole and magnetic-dipole matrix elements change sign upon reversal of the incident photon momentum q. Thus, the interference may be made constructive or destructive by reversal of either B0 or q. We propose magnetooptical experiments which would allow the determination of both the magnitude and sign of C by measuring the change in the magnetooptic absorption upon reversal of B0. We give criteria for the existence of the interference and discuss application to InSb, GaSb, and HgTe.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
