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Ultrafast photocurrents at the surface of the three-dimensional topological insulator Bi2Se3

Authors :
Lukas Braun
Gregor Mussler
Andrzej Hruban
Marcin Konczykowski
Thomas Schumann
Martin Wolf
Markus Münzenberg
Luca Perfetti
Tobias Kampfrath
Source :
Nature Communications, Vol 7, Iss 1, Pp 1-9 (2016)
Publication Year :
2016
Publisher :
Nature Portfolio, 2016.

Abstract

Surface currents in topological insulators can be controlled by light, but the underlying mechanisms are not well understood. Here, Braun et al. report an ultrafast shift photocurrent at the surface of Ca-doped Bi2Se3, whereas injection currents are much smaller than expected from asymmetric depopulation of the Dirac cone.

Subjects

Subjects :
Science

Details

Language :
English
ISSN :
20411723
Volume :
7
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Nature Communications
Publication Type :
Academic Journal
Accession number :
edsdoj.34a2be6cc348a7bc539c9304f998dd
Document Type :
article
Full Text :
https://doi.org/10.1038/ncomms13259