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Hedgehog spin texture and Berry's phase tuning in a magnetic topological insulator

Xu, Su-Yang; Neupane, Madhab; Liu, Chang; Zhang, Duming; Richardella, Anthony; Wray, L. Andrew; Alidoust, Nasser; Leandersson, Mats LU ; Thiagarajan, Balasubramanian LU and Sanchez-Barriga, Jaime, et al. (2012) In Nature Physics 8(8). p.616-622
Abstract
Understanding and control of spin degrees of freedom on the surfaces of topological materials are key to future applications as well as for realizing novel physics such as the axion electrodynamics associated with time-reversal (TR) symmetry breaking on the surface. We experimentally demonstrate magnetically induced spin reorientation phenomena simultaneous with a Dirac-metal to gapped-insulator transition on the surfaces of manganese-doped Bi2Se3 thin films. The resulting electronic groundstate exhibits unique hedgehog-like spin textures at low energies, which directly demonstrate the mechanics of TR symmetry breaking on the surface. We further show that an insulating gap induced by quantum tunnelling between surfaces exhibits spin... (More)
Understanding and control of spin degrees of freedom on the surfaces of topological materials are key to future applications as well as for realizing novel physics such as the axion electrodynamics associated with time-reversal (TR) symmetry breaking on the surface. We experimentally demonstrate magnetically induced spin reorientation phenomena simultaneous with a Dirac-metal to gapped-insulator transition on the surfaces of manganese-doped Bi2Se3 thin films. The resulting electronic groundstate exhibits unique hedgehog-like spin textures at low energies, which directly demonstrate the mechanics of TR symmetry breaking on the surface. We further show that an insulating gap induced by quantum tunnelling between surfaces exhibits spin texture modulation at low energies but respects TR invariance. These spin phenomena and the control of their Fermi surface geometrical phase first demonstrated in our experiments pave the way for the future realization of many predicted exotic magnetic phenomena of topological origin. (Less)
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Contribution to journal
publication status
published
subject
in
Nature Physics
volume
8
issue
8
pages
616 - 622
publisher
Nature Publishing Group
external identifiers
  • wos:000307223900014
  • scopus:84865041408
ISSN
1745-2473
DOI
10.1038/NPHYS2351
language
English
LU publication?
yes
id
336e964f-627c-4e46-9886-51b2a24d3969 (old id 3059792)
date added to LUP
2012-09-26 09:59:44
date last changed
2017-11-19 03:20:20
@article{336e964f-627c-4e46-9886-51b2a24d3969,
  abstract     = {Understanding and control of spin degrees of freedom on the surfaces of topological materials are key to future applications as well as for realizing novel physics such as the axion electrodynamics associated with time-reversal (TR) symmetry breaking on the surface. We experimentally demonstrate magnetically induced spin reorientation phenomena simultaneous with a Dirac-metal to gapped-insulator transition on the surfaces of manganese-doped Bi2Se3 thin films. The resulting electronic groundstate exhibits unique hedgehog-like spin textures at low energies, which directly demonstrate the mechanics of TR symmetry breaking on the surface. We further show that an insulating gap induced by quantum tunnelling between surfaces exhibits spin texture modulation at low energies but respects TR invariance. These spin phenomena and the control of their Fermi surface geometrical phase first demonstrated in our experiments pave the way for the future realization of many predicted exotic magnetic phenomena of topological origin.},
  author       = {Xu, Su-Yang and Neupane, Madhab and Liu, Chang and Zhang, Duming and Richardella, Anthony and Wray, L. Andrew and Alidoust, Nasser and Leandersson, Mats and Thiagarajan, Balasubramanian and Sanchez-Barriga, Jaime and Rader, Oliver and Landolt, Gabriel and Slomski, Bartosz and Dil, Jan Hugo and Osterwalder, Juerg and Chang, Tay-Rong and Jeng, Horng-Tay and Lin, Hsin and Bansil, Arun and Samarth, Nitin and Hasan, M. Zahid},
  issn         = {1745-2473},
  language     = {eng},
  number       = {8},
  pages        = {616--622},
  publisher    = {Nature Publishing Group},
  series       = {Nature Physics},
  title        = {Hedgehog spin texture and Berry's phase tuning in a magnetic topological insulator},
  url          = {http://dx.doi.org/10.1038/NPHYS2351},
  volume       = {8},
  year         = {2012},
}