Spontaneous emergence of a persistent spin helix from homogeneous spin polarization


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Slipko V. A. , Savran I., Pershin Y. V.

PHYSICAL REVIEW B, cilt.83, sa.19, 2011 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 83 Konu: 19
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1103/physrevb.83.193302
  • Dergi Adı: PHYSICAL REVIEW B

Özet

We demonstrate that a homogeneous spin polarization in one-dimensional structures of finite length in the presence of Bychkov-Rashba spin-orbit coupling decays spontaneously toward a persistent spin helix. Such a strikingly different and simple method enables us to generate robust spin structures whose properties can be tuned by the strength of the spin-orbit interaction and/or the structure's length. We generalize our results for the two-dimensional case predicting the formation of a persistent spin helix in two-dimensional channels from homogeneous spin polarization. An analysis of the formation of a spin helical state is presented within an approach based on a mapping of spin drift-diffusion equations into a heat equation for a complex field.