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Spin and valley control of free carriers in single-layer WS2

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Ulstrup_2017_Spin_PhysRevA_AAM.pdf (3.271Mb)
Date
23/01/2017
Author
Ulstrup, Søren
Čabo, Antonija Grubišić
Riley, Jonathon M.
Dendzik, Maciej
Sanders, Charlotte E.
Bianchi, Marco
Cacho, Cephise
Matselyukh, Dan
Chapman, Richard T.
Springate, Emma
King, Phil D. C.
Miwa, Jill A.
Hofmann, Philip
Funder
EPSRC
The Royal Society
Grant ID
EP/M023427/1
UF120096
Keywords
QC Physics
T Technology
DAS
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Abstract
The semiconducting single-layer transition metal dichalcogenides have been identified as ideal materials for accessing and manipulating spin- and valley-quantum numbers due to a set of favorable optical selection rules in these materials. Here, we apply time- and angle-resolved photoemission spectroscopy to directly probe optically excited free carriers in the electronic band structure of a high quality single layer (SL) of WS2 grown on Ag(111). We present a momentum resolved analysis of the optically generated free hole density around the valence band maximum of SL WS2 for linearly and circularly polarized optical excitations. We observe that the excited free holes are valley polarized within the upper spin-split branch of the valence band, which implies that the photon energy and polarization of the excitation permit selective excitations of free electron-hole pairs with a given spin and within a single valley.
Citation
Ulstrup , S , Čabo , A G , Riley , J M , Dendzik , M , Sanders , C E , Bianchi , M , Cacho , C , Matselyukh , D , Chapman , R T , Springate , E , King , P D C , Miwa , J A & Hofmann , P 2017 , ' Spin and valley control of free carriers in single-layer WS 2 ' , Physical Review. B, Condensed matter and materials physics , vol. 95 , no. 4 , 041405(R) . https://doi.org/10.1103/PhysRevB.95.041405
Publication
Physical Review. B, Condensed matter and materials physics
Status
Peer reviewed
DOI
https://doi.org/10.1103/PhysRevB.95.041405
ISSN
1098-0121
Type
Journal article
Rights
© 2017 American Physical Society. This work has been 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 journals.aps.org/prb / https://doi.org/10.1103/PhysRevB.95.041405
Description
Data are available from http://dx.doi.org/10.17630/a25b95c6-b9e8-4ecf-9559-bb09e58a7835
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/10054

Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

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