Quasi 2D electronic states with high spin-polarization in centrosymmetric MoS2 bulk crystals
Time reversal dictates that nonmagnetic, centrosymmetric crystals cannot be spin-polarized as a whole. However, it has been recently shown that the electronic structure in these crystals can in fact show regions of high spin-polarization, as long as it is probed locally in real and in reciprocal spa...
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Nature Publishing Group
2016
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| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4887890/ |
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pubmed-48878902016-06-09 Quasi 2D electronic states with high spin-polarization in centrosymmetric MoS2 bulk crystals Gehlmann, Mathias Aguilera, Irene Bihlmayer, Gustav Młyńczak, Ewa Eschbach, Markus Döring, Sven Gospodarič, Pika Cramm, Stefan Kardynał, Beata Plucinski, Lukasz Blügel, Stefan Schneider, Claus M. Article Time reversal dictates that nonmagnetic, centrosymmetric crystals cannot be spin-polarized as a whole. However, it has been recently shown that the electronic structure in these crystals can in fact show regions of high spin-polarization, as long as it is probed locally in real and in reciprocal space. In this article we present the first observation of this type of compensated polarization in MoS2 bulk crystals. Using spin- and angle-resolved photoemission spectroscopy (ARPES), we directly observed a spin-polarization of more than 65% for distinct valleys in the electronic band structure. By additionally evaluating the probing depth of our method, we find that these valence band states at the point in the Brillouin zone are close to fully polarized for the individual atomic trilayers of MoS2, which is confirmed by our density functional theory calculations. Furthermore, we show that this spin-layer locking leads to the observation of highly spin-polarized bands in ARPES since these states are almost completely confined within two dimensions. Our findings prove that these highly desired properties of MoS2 can be accessed without thinning it down to the monolayer limit. Nature Publishing Group 2016-06-01 /pmc/articles/PMC4887890/ /pubmed/27245646 http://dx.doi.org/10.1038/srep26197 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| repository_type |
Open Access Journal |
| institution_category |
Foreign Institution |
| institution |
US National Center for Biotechnology Information |
| building |
NCBI PubMed |
| collection |
Online Access |
| language |
English |
| format |
Online |
| author |
Gehlmann, Mathias Aguilera, Irene Bihlmayer, Gustav Młyńczak, Ewa Eschbach, Markus Döring, Sven Gospodarič, Pika Cramm, Stefan Kardynał, Beata Plucinski, Lukasz Blügel, Stefan Schneider, Claus M. |
| spellingShingle |
Gehlmann, Mathias Aguilera, Irene Bihlmayer, Gustav Młyńczak, Ewa Eschbach, Markus Döring, Sven Gospodarič, Pika Cramm, Stefan Kardynał, Beata Plucinski, Lukasz Blügel, Stefan Schneider, Claus M. Quasi 2D electronic states with high spin-polarization in centrosymmetric MoS2 bulk crystals |
| author_facet |
Gehlmann, Mathias Aguilera, Irene Bihlmayer, Gustav Młyńczak, Ewa Eschbach, Markus Döring, Sven Gospodarič, Pika Cramm, Stefan Kardynał, Beata Plucinski, Lukasz Blügel, Stefan Schneider, Claus M. |
| author_sort |
Gehlmann, Mathias |
| title |
Quasi 2D electronic states with high spin-polarization in centrosymmetric MoS2 bulk crystals |
| title_short |
Quasi 2D electronic states with high spin-polarization in centrosymmetric MoS2 bulk crystals |
| title_full |
Quasi 2D electronic states with high spin-polarization in centrosymmetric MoS2 bulk crystals |
| title_fullStr |
Quasi 2D electronic states with high spin-polarization in centrosymmetric MoS2 bulk crystals |
| title_full_unstemmed |
Quasi 2D electronic states with high spin-polarization in centrosymmetric MoS2 bulk crystals |
| title_sort |
quasi 2d electronic states with high spin-polarization in centrosymmetric mos2 bulk crystals |
| description |
Time reversal dictates that nonmagnetic, centrosymmetric crystals cannot be spin-polarized as a whole. However, it has been recently shown that the electronic structure in these crystals can in fact show regions of high spin-polarization, as long as it is probed locally in real and in reciprocal space. In this article we present the first observation of this type of compensated polarization in MoS2 bulk crystals. Using spin- and angle-resolved photoemission spectroscopy (ARPES), we directly observed a spin-polarization of more than 65% for distinct valleys in the electronic band structure. By additionally evaluating the probing depth of our method, we find that these valence band states at the point in the Brillouin zone are close to fully polarized for the individual atomic trilayers of MoS2, which is confirmed by our density functional theory calculations. Furthermore, we show that this spin-layer locking leads to the observation of highly spin-polarized bands in ARPES since these states are almost completely confined within two dimensions. Our findings prove that these highly desired properties of MoS2 can be accessed without thinning it down to the monolayer limit. |
| publisher |
Nature Publishing Group |
| publishDate |
2016 |
| url |
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4887890/ |
| _version_ |
1613586921129246720 |