An Exact SU(2) Symmetry and Persistent Spin Helix in a Spin-Orbit Coupled System
Journal Article
·
· Submitted to Physical Review Letters
OSTI ID:972232
Spin-orbit coupled systems generally break the spin rotation symmetry. However, for a model with equal Rashba and Dresselhauss coupling constant (the ReD model), and for the [110] Dresselhauss model, a new type of SU(2) spin rotation symmetry is discovered. This symmetry is robust against spin-independent disorder and interactions, and is generated by operators whose wavevector depends on the coupling strength. It renders the spin lifetime infinite at this wavevector, giving rise to a Persistent Spin Helix (PSH). We obtain the spin fluctuation dynamics at, and away, from the symmetry point, and suggest experiments to observe the PSH.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 972232
- Report Number(s):
- SLAC-PUB-13915
- Journal Information:
- Submitted to Physical Review Letters, Journal Name: Submitted to Physical Review Letters
- Country of Publication:
- United States
- Language:
- English
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