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Dual quantum confinement and anisotropic spin splitting in the multi-valley semimetal PtSe2

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Date
01/2019
Author
Clark, Oliver Jon
Mazzola, Federico
Feng, Jiagui
Sunko, Veronika
Marković, Igor
Bawden, Lewis
Kim, Timur K.
King, Philip David
Bahramy, Mohammad Saeed
Funder
European Research Council
EPSRC
The Leverhulme Trust
The Royal Society
EPSRC
Grant ID
714193
EP/L015110/1
2016-006
URF/R/180026
EP/I031014/1
Keywords
QC Physics
TK Electrical engineering. Electronics Nuclear engineering
DAS
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Abstract
We investigate the electronic structure of a two-dimensional electron gas created at the surface of the multivalley semimetal 1T−PtSe2. Using angle-resolved photoemission and first-principles-based surface space-charge calculations, we show how the induced quantum well sub-band states form multiple Fermi surfaces, which exhibit highly anisotropic Rashba-like spin splittings. We further show how the presence of both electronlike and holelike bulk carriers causes the near-surface band bending potential to develop an unusual nonmonotonic form, with spatially segregated electron accumulation and hole accumulation regions, which in turn amplifies the induced spin splitting. Our results thus demonstrate the novel environment that semimetals provide for tailoring electrostatically induced potential profiles and their corresponding quantum sub-band states.
Citation
Clark , O J , Mazzola , F , Feng , J , Sunko , V , Marković , I , Bawden , L , Kim , T K , King , P D & Bahramy , M S 2019 , ' Dual quantum confinement and anisotropic spin splitting in the multi-valley semimetal PtSe 2 ' , Physical Review B , vol. 99 , no. 4 , 045438 . https://doi.org/10.1103/PhysRevB.99.045438
Publication
Physical Review B
Status
Peer reviewed
DOI
https://doi.org/10.1103/PhysRevB.99.045438
ISSN
2469-9950
Type
Journal article
Rights
© 2019, 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 as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevB.99.045438
Description
The authors gratefully acknowledge support from the Leverhulme Trust (Grant No. RL-2016-006), the Royal Society, the European Research Council (Grant No. ERC-714193QUESTDO) CREST, JST (No. JPMJCR16F1), and the International Max-Planck Partnership for Measurement and Observation at the Quantum Limit. OJC, VS, and LB acknowledge EPSRC for PhD studentship support through grant Nos. EP/K503162/1, EP/L015110/1 and EP/G03673X/1. IM acknowledges PhD studentship support from the IMPRS for the Chemistry and Physics of Quantum Materials.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/16887

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