An Exact SU(2) Symmetry and Persistent Spin Helix in a Spin-Orbit Coupled System

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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.

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Bernevig, Andrei February 10, 2010.

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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.

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  • Journal Name: Submitted to Physical Review Letters

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  • Report No.: SLAC-PUB-13915
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 972232
  • Archival Resource Key: ark:/67531/metadc928141

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  • February 10, 2010

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Feb. 17, 2017, 6:34 p.m.

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Bernevig, Andrei. An Exact SU(2) Symmetry and Persistent Spin Helix in a Spin-Orbit Coupled System, article, February 10, 2010; United States. (digital.library.unt.edu/ark:/67531/metadc928141/: accessed October 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.