Campos, Tiago and Faria Junior, Paulo E. and Gmitra, Martin and Sipahi, Guilherme M. and Fabian, Jaroslav (2018) Spin-orbit coupling effects in zinc-blende InSb and wurtzite InAs nanowires: Realistic calculations with multiband k center dot p method. PHYSICAL REVIEW B, 97 (24): 245402. ISSN 2469-9950, 2469-9969
Full text not available from this repository.Abstract
A systematic numerical investigation of spin-orbit fields in the conduction bands of III-V semiconductor nanowires is performed. Zinc-blende (ZB) InSb nanowires are considered along [001], [011], and [111] directions, while wurtzite (WZ) InAs nanowires are studied along [0001] and [10 (1) over bar0] or [11 (2) over bar0] directions. Robust multiband k center dot p Hamiltonians are solved by using plane-wave expansions of real-space parameters. In all cases, the linear and cubic spin-orbit coupling parameters are extracted for nanowire widths from 30 to 100 nm. Typical spin-orbit energies are on the mu eV scale, except for WZ In As nanowires grown along [10 (1) over bar0] or [11 (2) over bar0], in which the spin-orbit energy is about meV, largely independent of the wire diameter. Significant spin-orbit coupling is obtained by applying a transverse electric field, causing the Rashba effect. For an electric field of about 4 mV/nm, the obtained spin-orbit energies are about 1 meV for both materials in all investigated growth directions. The most favorable system, in which the spin-orbit effects are maximal, are WZ InAs nanowires grown along [1010] or [11 (2) over bar0] since here spin-orbit energies are giant (meV) already in the absence of electric field. The least favorable are InAs WZ nanowires grown along [0001] since here even the electric field does not increase the spin-orbit energies beyond 0.1 meV. The presented results should be useful for investigations of optical orientation, spin transport, weak localization, and superconducting proximity effects in semiconductor nanowires.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BAND-STRUCTURE; MAJORANA FERMIONS; QUANTUM-WELLS; SEMICONDUCTORS; GROWTH; SUPERCONDUCTOR; CONDUCTANCE; GAAS; APPROXIMATION; SUPERLATTICES; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 09 Mar 2020 10:21 |
| Last Modified: | 09 Mar 2020 10:21 |
| URI: | https://pred.uni-regensburg.de/id/eprint/14417 |
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