Title
Topological surface state enhanced photothermoelectric effect in <tex>$Bi_{2}Se_{3}$</tex> nanoribbons Topological surface state enhanced photothermoelectric effect in <tex>$Bi_{2}Se_{3}$</tex> nanoribbons
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Washington ,
Subject
Physics
Chemistry
Engineering sciences. Technology
Source (journal)
Nano letters / American Chemical Society. - Washington
Volume/pages
14(2014) :8 , p. 4389-4394
ISSN
1530-6984
ISI
000340446200028
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The photothermoelectric effect in topological insulator Bi2Se3 nanoribbons is studied. The topological surface states are excited to be spin-polarized by circularly polarized light. Because the direction of the electron spin is locked to its momentum for the spin-helical surface states, the photothermoelectric effect is significantly enhanced as the oriented motions of the polarized spins are accelerated by the temperature gradient. The results are explained based on the microscopic mechanisms of a photon induced spin transition from the surface Dirac cone to the bulk conduction band. The as-reported enhanced photothermoelectric effect is expected to have potential applications in a spin-polarized power source.
E-info
https://repository.uantwerpen.be/docman/iruaauth/66883b/14ec7bc9956.pdf
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