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Proceedings Paper

Momentum space view of the ultrafast dynamics of surface photocurrents on topological insulators
Author(s): K. Kuroda; J. Reimann; J. Güdde; U. Höfer
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Paper Abstract

The Dirac-cone surface states of topological insulators are characterized by a chiral spin texture in k-space with the electron spin locked to its parallel momentum. Mid-infrared pump pulses can induce spin-polarized photocurrents in such a topological surface state by optical transitions between the occupied and unoccupied part of the Dirac cone. We monitor the ultrafast dynamics of the corresponding asymmetric electron population in momentum space directly by time- and angle-resolved two-photon photoemission (2PPE). The elastic scattering times of 2.5 ps deduced for Sb2Te3 corresponds to a mean-fee path of 0.75 μm in real space.

Paper Details

Date Published: 23 February 2017
PDF: 8 pages
Proc. SPIE 10102, Ultrafast Phenomena and Nanophotonics XXI, 101020Q (23 February 2017); doi: 10.1117/12.2250295
Show Author Affiliations
K. Kuroda, Philipps-Univ. Marburg (Germany)
Univ. of Tokyo (Japan)
J. Reimann, Philipps-Univ. Marburg (Germany)
J. Güdde, Philipps-Univ. Marburg (Germany)
U. Höfer, Philipps-Univ. Marburg (Germany)

Published in SPIE Proceedings Vol. 10102:
Ultrafast Phenomena and Nanophotonics XXI
Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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