St Andrews Research Repository

St Andrews University Home
View Item 
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  • Login
JavaScript is disabled for your browser. Some features of this site may not work without it.

Ultrafast band structure control of a two-dimensional heterostructure

Thumbnail
View/Open
MoS2_gr_TR_ARPES.pdf (4.358Mb)
Date
28/06/2016
Author
Ulstrup, Søren
Grubišić Čabo, Antonija
Miwa, Jill A
Riley, Jonathon Mark
Grønborg, Signe S
Johannsen, Jens C
Cacho, Cephise
Alexander, Oliver
Chapman, Richard T
Springate, Emma
Bianchi, Mario
Dendzik, Maciej
Lauritsen, Jeppe V
King, Philip David
Hofmann, Philip
Keywords
Ultrafast time- and angle-resolved photoemission
Band gap renormalization
2D material heterostructures
Graphene
Transition metal dichalcogenides
QC Physics
TK Electrical engineering. Electronics Nuclear engineering
DAS
Metadata
Show full item record
Altmetrics Handle Statistics
Altmetrics DOI Statistics
Abstract
The electronic structure of two-dimensional (2D) semiconductors can be signicantly altered by screening effects, either from free charge carriers in the material itself, or by environmental screening from the surrounding medium. The physical properties of 2D semiconductors placed in a heterostructure with other 2D materials are therefore governed by a complex interplay of both intra- and inter-layer interactions. Here, using time- and angle-resolved photoemission, we are able to isolate both the layer-resolved band structure and, more importantly, the transient band structure evolution of a model 2D heterostructure formed of a single layer of MoS 2 on graphene. Our results reveal a pronounced renormalization of the quasiparticle gap of the MoS 2 layer. Following optical excitation, the band gap is reduced by up to ∼400 meV on femtosecond timescales due to a persistence of strong electronic interactions despite the environmental screening by the n-doped graphene. This points to a large degree of tuneability of both the electronic structure and electron dynamics for 2D semiconductors embedded in a van der Waals-bonded heterostructure.
Citation
Ulstrup , S , Grubišić Čabo , A , Miwa , J A , Riley , J M , Grønborg , S S , Johannsen , J C , Cacho , C , Alexander , O , Chapman , R T , Springate , E , Bianchi , M , Dendzik , M , Lauritsen , J V , King , P D & Hofmann , P 2016 , ' Ultrafast band structure control of a two-dimensional heterostructure ' , ACS Nano , vol. 10 , no. 6 , pp. 6315-6322 . https://doi.org/10.1021/acsnano.6b02622
Publication
ACS Nano
Status
Peer reviewed
DOI
https://doi.org/10.1021/acsnano.6b02622
ISSN
1936-0851
Type
Journal article
Rights
© 2016, American Chemical Society. 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 pubs.acs.org / https://dx.doi.org/10.1021/acsnano.6b02622
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/10914

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

Advanced Search

Browse

All of RepositoryCommunities & CollectionsBy Issue DateNamesTitlesSubjectsClassificationTypeFunderThis CollectionBy Issue DateNamesTitlesSubjectsClassificationTypeFunder

My Account

Login

Open Access

To find out how you can benefit from open access to research, see our library web pages and Open Access blog. For open access help contact: openaccess@st-andrews.ac.uk.

Accessibility

Read our Accessibility statement.

How to submit research papers

The full text of research papers can be submitted to the repository via Pure, the University's research information system. For help see our guide: How to deposit in Pure.

Electronic thesis deposit

Help with deposit.

Repository help

For repository help contact: Digital-Repository@st-andrews.ac.uk.

Give Feedback

Cookie policy

This site may use cookies. Please see Terms and Conditions.

Usage statistics

COUNTER-compliant statistics on downloads from the repository are available from the IRUS-UK Service. Contact us for information.

© University of St Andrews Library

University of St Andrews is a charity registered in Scotland, No SC013532.

  • Facebook
  • Twitter