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Direct observation of spin-polarized bulk bands in an inversion-symmetric semiconductor

Riley, J. M.; Mazzola, F.; Dendzik, M.; Michiardi, M.; Takayama, T.; Bawden, L.; Granerod, C.; Leandersson, Mats LU ; Thiagarajan, Balasubramanian LU and Hoesch, M., et al. (2014) In Nature Physics 10(11). p.835-839
Abstract
Methods to generate spin-polarized electronic states in nonmagnetic solids are strongly desired to enable all-electrical manipulation of electron spins for new quantum devices(1). This is generally accepted to require breaking global structural inversion symmetry(1-5). In contrast, here we report the observation from spin- and angle-resolved photoemission spectroscopy of spin-polarized bulk states in the centrosymmetric transition-metal dichalcogenide WSe2. Mediated by a lack of inversion symmetry in constituent structural units of the bulk crystal where the electronic states are localized(6), we show how spin splittings up to similar to 0.5 eV result, with a spin texture that is strongly modulated in both real and momentum space. Through... (More)
Methods to generate spin-polarized electronic states in nonmagnetic solids are strongly desired to enable all-electrical manipulation of electron spins for new quantum devices(1). This is generally accepted to require breaking global structural inversion symmetry(1-5). In contrast, here we report the observation from spin- and angle-resolved photoemission spectroscopy of spin-polarized bulk states in the centrosymmetric transition-metal dichalcogenide WSe2. Mediated by a lack of inversion symmetry in constituent structural units of the bulk crystal where the electronic states are localized(6), we show how spin splittings up to similar to 0.5 eV result, with a spin texture that is strongly modulated in both real and momentum space. Through this, our study provides direct experimental evidence for a putative locking of the spin with the layer and valley pseudospins in transition-metal dichalcogenides(7,8), of key importance for using these compounds in proposed valleytronic devices. (Less)
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subject
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Nature Physics
volume
10
issue
11
pages
835 - 839
publisher
Nature Publishing Group
external identifiers
  • wos:000344846700016
  • scopus:84908606809
ISSN
1745-2473
DOI
10.1038/NPHYS3105
language
English
LU publication?
yes
id
d86cc5e4-4240-4724-b2c4-4c4058255ab4 (old id 4865378)
date added to LUP
2014-12-18 13:20:23
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2017-11-19 03:13:38
@article{d86cc5e4-4240-4724-b2c4-4c4058255ab4,
  abstract     = {Methods to generate spin-polarized electronic states in nonmagnetic solids are strongly desired to enable all-electrical manipulation of electron spins for new quantum devices(1). This is generally accepted to require breaking global structural inversion symmetry(1-5). In contrast, here we report the observation from spin- and angle-resolved photoemission spectroscopy of spin-polarized bulk states in the centrosymmetric transition-metal dichalcogenide WSe2. Mediated by a lack of inversion symmetry in constituent structural units of the bulk crystal where the electronic states are localized(6), we show how spin splittings up to similar to 0.5 eV result, with a spin texture that is strongly modulated in both real and momentum space. Through this, our study provides direct experimental evidence for a putative locking of the spin with the layer and valley pseudospins in transition-metal dichalcogenides(7,8), of key importance for using these compounds in proposed valleytronic devices.},
  author       = {Riley, J. M. and Mazzola, F. and Dendzik, M. and Michiardi, M. and Takayama, T. and Bawden, L. and Granerod, C. and Leandersson, Mats and Thiagarajan, Balasubramanian and Hoesch, M. and Kim, T. K. and Takagi, H. and Meevasana, W. and Hofmann, Ph and Bahramy, M. S. and Wells, J. W. and King, P. D. C.},
  issn         = {1745-2473},
  language     = {eng},
  number       = {11},
  pages        = {835--839},
  publisher    = {Nature Publishing Group},
  series       = {Nature Physics},
  title        = {Direct observation of spin-polarized bulk bands in an inversion-symmetric semiconductor},
  url          = {http://dx.doi.org/10.1038/NPHYS3105},
  volume       = {10},
  year         = {2014},
}