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Title: Symmetry rules shaping spin-orbital textures in surface states

Abstract

Strong spin-orbit coupling creates exotic electronic states such as Rashba and topological surface states, which hold promise for technologies involving the manipulation of spin. Only recently has the complexity of these surface states been appreciated: they are composed of several atomic orbitals with distinct spin textures in momentum space. A complete picture of the wave function must account for this orbital dependence of spin. We discover that symmetry constrains the way orbital and spin components of a state coevolve as a function of momentum, and from this, we determine the rules governing how the two degrees of freedom are interwoven. We directly observe this complexity in spin-resolved photoemission and ab initio calculations of the topological surface states of Sb(111), where the photoelectron spin direction near ¯¯¯Γ is found to have a strong and unusual dependence on photon polarization. This dependence unexpectedly breaks down at large |k|, where the surface states mix with other nearby surface states. However, along mirror planes, symmetry protects the distinct spin orientations of different orbitals. Our discovery broadens the understanding of surface states with strong spin-orbit coupling, demonstrates the conditions that allow for optical manipulation of photoelectron spin, and will be highly instructive for future spintronicsmore » applications.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1544384
DOE Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 24; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Gotlieb, Kenneth, Li, Zhenglu, Lin, Chiu-Yun, Jozwiak, Chris, Ryoo, Ji Hoon, Park, Cheol-Hwan, Hussain, Zahid, Louie, Steven G., and Lanzara, Alessandra. Symmetry rules shaping spin-orbital textures in surface states. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.245142.
Gotlieb, Kenneth, Li, Zhenglu, Lin, Chiu-Yun, Jozwiak, Chris, Ryoo, Ji Hoon, Park, Cheol-Hwan, Hussain, Zahid, Louie, Steven G., & Lanzara, Alessandra. Symmetry rules shaping spin-orbital textures in surface states. United States. doi:10.1103/PhysRevB.95.245142.
Gotlieb, Kenneth, Li, Zhenglu, Lin, Chiu-Yun, Jozwiak, Chris, Ryoo, Ji Hoon, Park, Cheol-Hwan, Hussain, Zahid, Louie, Steven G., and Lanzara, Alessandra. Thu . "Symmetry rules shaping spin-orbital textures in surface states". United States. doi:10.1103/PhysRevB.95.245142.
@article{osti_1544384,
title = {Symmetry rules shaping spin-orbital textures in surface states},
author = {Gotlieb, Kenneth and Li, Zhenglu and Lin, Chiu-Yun and Jozwiak, Chris and Ryoo, Ji Hoon and Park, Cheol-Hwan and Hussain, Zahid and Louie, Steven G. and Lanzara, Alessandra},
abstractNote = {Strong spin-orbit coupling creates exotic electronic states such as Rashba and topological surface states, which hold promise for technologies involving the manipulation of spin. Only recently has the complexity of these surface states been appreciated: they are composed of several atomic orbitals with distinct spin textures in momentum space. A complete picture of the wave function must account for this orbital dependence of spin. We discover that symmetry constrains the way orbital and spin components of a state coevolve as a function of momentum, and from this, we determine the rules governing how the two degrees of freedom are interwoven. We directly observe this complexity in spin-resolved photoemission and ab initio calculations of the topological surface states of Sb(111), where the photoelectron spin direction near ¯¯¯Γ is found to have a strong and unusual dependence on photon polarization. This dependence unexpectedly breaks down at large |k|, where the surface states mix with other nearby surface states. However, along mirror planes, symmetry protects the distinct spin orientations of different orbitals. Our discovery broadens the understanding of surface states with strong spin-orbit coupling, demonstrates the conditions that allow for optical manipulation of photoelectron spin, and will be highly instructive for future spintronics applications.},
doi = {10.1103/PhysRevB.95.245142},
journal = {Physical Review B},
issn = {2469-9950},
number = 24,
volume = 95,
place = {United States},
year = {2017},
month = {6}
}

Works referenced in this record:

Observation of Unconventional Quantum Spin Textures in Topological Insulators
journal, February 2009


QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials
journal, September 2009

  • Giannozzi, Paolo; Baroni, Stefano; Bonini, Nicola
  • Journal of Physics: Condensed Matter, Vol. 21, Issue 39, Article No. 395502
  • DOI: 10.1088/0953-8984/21/39/395502