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

Jonathon Mark Riley; F. Mazzola; M. Dendzik; M. Michiardi; T. Takayama; Lewis Bawden; C. Granerød; M. Leandersson; T. Balasubramanian; M. Hoesch; T. K. Kim; H. Takagi; W. Meevasana; Ph. Hofmann; M. S. Bahramy; J. W. Wells; Phil King

doi:10.1038/nphys3105

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

Jonathon Mark Riley, F. Mazzola, M. Dendzik, M. Michiardi, T. Takayama, Lewis Bawden, C. Granerød, M. Leandersson, T. Balasubramanian, M. Hoesch, T. K. Kim, H. Takagi, W. Meevasana, Ph. Hofmann, M. S. Bahramy, J. W. Wells, Phil King

Research output: Contribution to journal › Article › peer-review

Abstract

Methods to generate spin-polarized electronic states in non-magnetic solids are strongly desired to enable all-electrical manipulation of electron spins for new quantum devices¹. This is generally accepted to require breaking global structural inversion symmetry^{1, 2, 3, 4, 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 localized⁶, we show how spin splittings up 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.

Original language	English
Pages (from-to)	835–839
Number of pages	5
Journal	Nature Physics
Volume	10
Issue number	11
Early online date	5 Oct 2014
DOIs	https://doi.org/10.1038/nphys3105
Publication status	Published - Nov 2014

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Copyright 2014 The Authors. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://dx.doi.org/10.1038/nphys3105
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Riley, J. M., Mazzola, F., Dendzik, M., Michiardi, M., Takayama, T., Bawden, L., Granerød, C., Leandersson, M., Balasubramanian, T., Hoesch, M., Kim, T. K., Takagi, H., Meevasana, W., Hofmann, P., Bahramy, M. S., Wells, J. W., & King, P. (2014). Direct observation of spin-polarized bulk bands in an inversion-symmetric semiconductor. Nature Physics, 10(11), 835–839. https://doi.org/10.1038/nphys3105

@article{d8cc06bf663b47059cda32452b1e241a,

title = "Direct observation of spin-polarized bulk bands in an inversion-symmetric semiconductor",

abstract = "Methods to generate spin-polarized electronic states in non-magnetic solids are strongly desired to enable all-electrical manipulation of electron spins for new quantum devices1. This is generally accepted to require breaking global structural inversion symmetry1, 2, 3, 4, 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 localized6, we show how spin splittings up 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 dichalcogenides7, 8, of key importance for using these compounds in proposed valleytronic devices.",

author = "Riley, {Jonathon Mark} and F. Mazzola and M. Dendzik and M. Michiardi and T. Takayama and Lewis Bawden and C. Graner{\o}d and M. Leandersson and T. Balasubramanian and M. Hoesch and Kim, {T. K.} and H. Takagi and W. Meevasana and Ph. Hofmann and Bahramy, {M. S.} and Wells, {J. W.} and Phil King",

note = "The authors acknowledge support from the Engineering and Physical Sciences Research Council, UK, the VILLUM foundation, the Calipso program, TRF-SUT Grant RSA5680052 and NANOTEC, Thailand through the CoE Network. P.D.C.K. acknowledges support from the Royal Society through a University Research Fellowship. M.S.B. was supported by a Grant-in-Aid for Scientific Research (S) (No. 24224009) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan. ",

year = "2014",

month = nov,

doi = "10.1038/nphys3105",

language = "English",

volume = "10",

pages = "835–839",

journal = "Nature Physics",

issn = "1745-2473",

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Riley, JM, Mazzola, F, Dendzik, M, Michiardi, M, Takayama, T, Bawden, L, Granerød, C, Leandersson, M, Balasubramanian, T, Hoesch, M, Kim, TK, Takagi, H, Meevasana, W, Hofmann, P, Bahramy, MS, Wells, JW & King, P 2014, 'Direct observation of spin-polarized bulk bands in an inversion-symmetric semiconductor', Nature Physics, vol. 10, no. 11, pp. 835–839. https://doi.org/10.1038/nphys3105

TY - JOUR

T1 - Direct observation of spin-polarized bulk bands in an inversion-symmetric semiconductor

AU - Riley, Jonathon Mark

AU - Mazzola, F.

AU - Dendzik, M.

AU - Michiardi, M.

AU - Takayama, T.

AU - Bawden, Lewis

AU - Granerød, C.

AU - Leandersson, M.

AU - Balasubramanian, T.

AU - Hoesch, M.

AU - Kim, T. K.

AU - Takagi, H.

AU - Meevasana, W.

AU - Hofmann, Ph.

AU - Bahramy, M. S.

AU - Wells, J. W.

AU - King, Phil

N1 - The authors acknowledge support from the Engineering and Physical Sciences Research Council, UK, the VILLUM foundation, the Calipso program, TRF-SUT Grant RSA5680052 and NANOTEC, Thailand through the CoE Network. P.D.C.K. acknowledges support from the Royal Society through a University Research Fellowship. M.S.B. was supported by a Grant-in-Aid for Scientific Research (S) (No. 24224009) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan.

PY - 2014/11

Y1 - 2014/11

N2 - Methods to generate spin-polarized electronic states in non-magnetic solids are strongly desired to enable all-electrical manipulation of electron spins for new quantum devices1. This is generally accepted to require breaking global structural inversion symmetry1, 2, 3, 4, 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 localized6, we show how spin splittings up 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 dichalcogenides7, 8, of key importance for using these compounds in proposed valleytronic devices.

AB - Methods to generate spin-polarized electronic states in non-magnetic solids are strongly desired to enable all-electrical manipulation of electron spins for new quantum devices1. This is generally accepted to require breaking global structural inversion symmetry1, 2, 3, 4, 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 localized6, we show how spin splittings up 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 dichalcogenides7, 8, of key importance for using these compounds in proposed valleytronic devices.

UR - https://www.nature.com/articles/nphys3105#Sec5

U2 - 10.1038/nphys3105

DO - 10.1038/nphys3105

M3 - Article

SN - 1745-2473

VL - 10

SP - 835

EP - 839

JO - Nature Physics

JF - Nature Physics

IS - 11

ER -

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

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Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems

Phil King

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

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2D - HREELS: Research grant - URF 2013 appointed

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems

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Phil King

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