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Electronic structure and enhanced charge-density wave order of monolayer VSe2

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Feng_2018_NanoLetters_VSe2_AAM.pdf (6.549Mb)
Date
11/07/2018
Author
Feng, Jiagui
Biswas, Deepnarayan
Akhil, Rajan
Watson, Matthew D.
Mazzola, Federico
Clark, Oliver Jon
Underwood, Kaycee
Markovic, Igor
McLaren, Martin
Hunter, Andrew
Burn, David M.
Duffy, Liam B.
Barua, Sourabh
Balakrishnan, Geetha
Bertran, François
Le Fevre, Patrick
Kim, Timur K.
van der Laan, Gerrit
Hesjedal, Thorsten
Wahl, Peter
King, Philip D C.
Funder
The Leverhulme Trust
EPSRC
EPSRC
EPSRC
The Leverhulme Trust
Grant ID
PLP-2015-144
EP/I031014/1
EP/M023958/1
EP/L015110/1
2016-006
Keywords
VSe2
Charge-density wave
Transition-metal dichalcogenide
Monolayer
QC Physics
DAS
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Abstract
How the interacting electronic states and phases of layered transition-metal dichalcogenides evolve when thinned to the single-layer limit is a key open question in the study of two-dimensional materials. Here, we use angle-resolved photoemission to investigate the electronic structure of monolayer VSe2 grown on bi-layer graphene/SiC. While the global electronic structure is similar to that of bulk VSe2, we show that, for the monolayer, pronounced energy gaps develop over the entire Fermi surface with decreasing temperature below Tc = 140 ± 5 K, concomitant with the emergence of charge-order superstructures evident in low-energy electron diraction. These observations point to a charge-density wave instability in the monolayer which is strongly enhanced over that of the bulk. Moreover, our measurements of both the electronic structure and of x-ray magnetic circular dichroism reveal no signatures of a ferromagnetic ordering, in contrast to the results of a recent experimental study as well as expectations from density-functional theory. Our study thus points to a delicate balance that can be realised between competing interacting states and phases in monolayer transition-metal dichalcogenides.
Citation
Feng , J , Biswas , D , Akhil , R , Watson , M D , Mazzola , F , Clark , O J , Underwood , K , Markovic , I , McLaren , M , Hunter , A , Burn , D M , Duffy , L B , Barua , S , Balakrishnan , G , Bertran , F , Le Fevre , P , Kim , T K , van der Laan , G , Hesjedal , T , Wahl , P & King , P D C 2018 , ' Electronic structure and enhanced charge-density wave order of monolayer VSe 2 ' , Nano Letters , vol. 18 , no. 7 , pp. 4493-4499 . https://doi.org/10.1021/acs.nanolett.8b01649
Publication
Nano Letters
Status
Peer reviewed
DOI
https://doi.org/10.1021/acs.nanolett.8b01649
ISSN
1530-6984
Type
Journal item
Rights
Copyright © 2018 American Chemical 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 https://doi.org/10.1021/acs.nanolett.8b01649
Description
We gratefully acknowledge support from The Leverhulme Trust (Grant Nos. RL-2016-006 and PLP-2015-144), The Royal Society, The Engineering and Physical Sciences Research Council, UK, for support under grant Nos. EP/I031014/1, EP/M023958/1, EP/P020151/1, and EP/M028771/1, and the International Max-Planck Partnership for Measurement and Observation at the Quantum Limit. OJC and KU acknowledge EPSRC for PhD studentship support through grant Nos. EP/K503162/1 and EP/L015110/1. IM acknowledges PhD studentship support from the IMPRS for the Chemistry and Physics of Quantum Materials. LBD acknowledges studentship support from EPSRC and the Science and Technology Facilities Council (UK).
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/17910

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