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An Exact SU(2) Symmetry and Persistent Spin Helix in a Spin-Orbit Coupled System | | B. Andrei Bernevig
; J. Orenstein
; Shou-Cheng Zhang
; | | Date: |
7 Jun 2006 | | Subject: | Other | | Abstract: | 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. | | Source: | arXiv, cond-mat/0606196 | | Services: | Forum | Review | PDF | Favorites | |
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