Korn, T. and Schueller, C. (2014) Hole spin dynamics and valence-band spin excitations in two-dimensional hole systems. PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 251 (9). pp. 1881-1891. ISSN 0370-1972, 1521-3951
Full text not available from this repository. (Request a copy)Abstract
In recent years, the spin dynamics and spin-orbit interaction in GaAs-based two-dimensional hole systems (2DHS) have created a lot of attention. This is due to the complex structure of the valence band, with its p-like character, which leads to strong spin-orbit coupling. In this paper, we review our recent studies on hole spin dynamics and valence-band spin excitations in GaAs-based, p-modulation-doped quantum wells (QWs). In 2DHS with low carrier concentration, we demonstrate that maximizing the heavy-hole-light-hole band splitting by changing the QW width leads to long hole spin dephasing times at low temperatures. Different mechanisms for initializing a resident hole spin polarization by optical excitation are presented. To accurately determine hole spin dynamics parameters, the resonant spin amplification technique is utilized. The strong anisotropy of the hole g factor, and electrical g factor control are investigated, using this technique. In highly doped 2DHS, we use resonant inelastic light scattering (RILS) to study the spin splitting of the valence band. We observe a low-energy spin-density excitation (SDE), which is a measure of the spin splitting of the hole ground state. By varying the laser energy in the RILS experiment, we can resonantly probe the k dependence of the spin splitting. The spectral shape of the SDE depends on the orientation of the light polarizations relative to the crystal axes and reflects the in-plane anisotropy of the valence-band spin splitting.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QUANTUM-WELL STRUCTURES; GAAS; RELAXATION; NANOSTRUCTURES; AMPLIFICATION; COHERENCE; DOTS; electronic excitations; inelastic light scattering; spin dynamics; two-dimensional hole systems |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Aug 2019 13:10 |
| Last Modified: | 27 Aug 2019 13:10 |
| URI: | https://pred.uni-regensburg.de/id/eprint/9641 |
Actions (login required)
 |
View Item |
