Near-Resonance Spontaneous-Spin-Flip Light Scattering in InSb
- 15 June 1973
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 7 (12), 5253-5271
- https://doi.org/10.1103/physrevb.7.5253
Abstract
The properties of near-resonance spontaneous-spin-flip Raman scattering in InSb have been studied both experimentally using a 5-6-μm CO laser and theoretically. The polarization selection rules for both linearly and circularly polarized light have been investigated. The experimental results are in good agreement with the theoretical predictions. The resonance enhancement of the spontaneous-scattering cross section for an input photon energy near the InSb energy gap has been studied as a function of input photon energy and magnetic field. Good agreement is found between the experimental data and a theoretical treatment which includes both the effects of varying population factors and the dependence of the spin-flip cross section. The linewidth and, where it could be resolved, the line shape of spontaneous-spin-flip Raman scattering was studied experimentally as a function of electron concentration (1-3 × ), temperature (2-50 K), and magnetic field (20-80 kG). Two different geometries were studied. In both geometries, the incident photon propagated normal to the magnetic field . In one geometry the scattered light was collected colinear with the incident light (), while in the other geometry it was collected along at right angles to the incident light (). The linewidth in the geometry was very narrow (0.2-0.4 ) and almost independent of magnetic field. The linewidth in the geometry was strongly dependent on magnetic field. It varied from a maximum of 6.5 at 21 kG to a minimum of 0.2-0.3 at 80.5 kG. The linewidth in the geometry was almost independent of temperature, while the linewidth in the geometry broadened appreciably at higher temperatures. These features of the spin-flip Raman-scattering line shape are shown to be inconsistent with the simplest spin-relaxation theory of the line shape that includes the inhomogeneous broadening due to the nonparabolicity of the InSb conduction band (present in both geometries) and the Doppler shift (in the geometry only). A theory which includes orbital collisions that alter the state of the spin excitation is considered and is found to give results that are in good agreement with the experiment.
Keywords
This publication has 38 references indexed in Scilit:
- Near-Resonance Spin-Flip Raman Scattering in Indium AntimonidePhysical Review Letters, 1972
- Electric-Dipole-Excited Electron Spin Resonance in InSbPhysical Review B, 1971
- Relaxation-Time Ansatz for Quantum Transport Theory: Spin EffectsPhysical Review B, 1971
- Tunable Stimulated Raman Scattering from Mobile Carriers in SemiconductorsPhysical Review B, 1971
- Splitting of Conduction-Electron Spin-Resonance Line in Indium Antimonide in Quantizing Magnetic FieldsPhysical Review Letters, 1970
- Infrared Cyclotron Resonance and Related Experiments in the Conduction Band of InSbPhysical Review B, 1970
- Concentration and Magnetic-Field Dependence of Spin-Flip Magneto-Raman ScatteringPhysical Review B, 1969
- Electron Spin Resonance in-Type InSbPhysical Review B, 1968
- Nuclear Polarization in InSb by a dc CurrentPhysical Review Letters, 1963
- Precise Neutron and Proton Form Factors at Low Momentum TransfersPhysical Review Letters, 1962