Skip to content Skip to navigation
University of Warwick
  • Study
  • |
  • Research
  • |
  • Business
  • |
  • Alumni
  • |
  • News
  • |
  • About

University of Warwick
Publications service & WRAP

Highlight your research

  • WRAP
    • Home
    • Search WRAP
    • Browse by Warwick Author
    • Browse WRAP by Year
    • Browse WRAP by Subject
    • Browse WRAP by Department
    • Browse WRAP by Funder
    • Browse Theses by Department
  • Publications Service
    • Home
    • Search Publications Service
    • Browse by Warwick Author
    • Browse Publications service by Year
    • Browse Publications service by Subject
    • Browse Publications service by Department
    • Browse Publications service by Funder
  • Help & Advice
University of Warwick

The Library

  • Login
  • Admin

Exceptional surface and bulk electronic structures in a topological insulator, Bi2Se3

Tools
- Tools
+ Tools

Biswas, Deepnarayan, Thakur, Sangeeta, Balakrishnan, Geetha and Maiti, Kalobaran (2015) Exceptional surface and bulk electronic structures in a topological insulator, Bi2Se3. Scientific Reports, 5 . 17351. doi:10.1038/srep17351

[img]
Preview
PDF
Biswas_SciRep_5_17351_2015.pdf - Published Version - Requires a PDF viewer.
Available under License Creative Commons Attribution 4.0.

Download (1429Kb) | Preview
Official URL: http://dx.doi.org/10.1038/srep17351

Request Changes to record.

Abstract

The outstanding problem in topological insulators is the bulk metallicity underneath topologically ordered surface states and the appearance of Dirac point far away from the Fermi energy. Enormous efforts are being devoted to get the Dirac point at the Fermi level via exposure to foreign materials so that these materials can be used in technology and realize novel fundamental physics. Ironically, the conclusion of bulk metallicity in the electronic structure is essentially based on the angle resolved photoemission spectroscopy, a highly surface sensitive technique. Here, we employed state of-the-art hard x-ray photoemission spectroscopy with judiciously chosen experiment geometry to delineate the bulk electronic structure of a topological insulator and a potential thermoelectric material, Bi2Se3. The
results exhibit signature of insulating bulk electronic structure with tiny intensities at ef akin to defect/vacancy induced doped states in the semiconductors. The core level spectra exhibit intense plasmon peak associated to core level excitations manifesting the signature of coupling of electrons to the collective excitations, a possible case of plasmon-phonon coupling. In addition, a new loss feature appear in the core level spectra indicating presence of additional collective excitations in the system.

Item Type: Journal Article
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Fermi surfaces , Thermoelectric materials , Photoemission, Semiconductors
Journal or Publication Title: Scientific Reports
Publisher: Nature Publishing Group
ISSN: 2045-2322
Official Date: 8 December 2015
Dates:
DateEvent
8 December 2015Published
29 October 2015Accepted
Volume: 5
Article Number: 17351
DOI: 10.1038/srep17351
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
Funder: India. Department of Atomic Energy, Deutsches Elektronen-Synchrotron (Center), Engineering and Physical Sciences Research Council (EPSRC)
Grant number: EP/L014963/1 (EPSRC)

Request changes or add full text files to a record

Repository staff actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics

twitter

Email us: wrap@warwick.ac.uk
Contact Details
About Us