Origin of spin-polarized photocurrents in the topological surface states of Bi2 Se3
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23640%2F18%3A43952820" target="_blank" >RIV/49777513:23640/18:43952820 - isvavai.cz</a>
Result on the web
<a href="http://hdl.handle.net/11025/30745" target="_blank" >http://hdl.handle.net/11025/30745</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevB.98.155406" target="_blank" >10.1103/PhysRevB.98.155406</a>
Alternative languages
Result language
angličtina
Original language name
Origin of spin-polarized photocurrents in the topological surface states of Bi2 Se3
Original language description
For the generation of spin-polarized photocurrents in topological insulators, a coupling between photon angular momentum and electron spin is often assumed. Such a coupling seems to be supported by dichroism reported in E(ky)-intensity maps in photoemission. We show in three dimensional two-photon photoemission and one-step photoemission calculations that the circular dichroism is in fact threefold in E(kx,k y) maps although it may appear antisymmetric in E(ky). The threefold symmetry is inconsistent with the previously assumed coupling between photon momentum and electron’s chiral spin via the orbital momentum. Instead it reflects the surface point group. The only antisymmetric patterns appear in the energy range in which surface and bulk states hybridize. In general, a threefold-symmetric dichroic signal does not support unidirectional photocurrents. Nevertheless, the residual asymmetry of up to 3.5% in our photoemission spectra is compatible with previously observed helicity-dependent photocurrents.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
<a href="/en/project/EF15_003%2F0000358" target="_blank" >EF15_003/0000358: Computational and Experimental Design of Advanced Materials with New Functionalities</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review B
ISSN
2469-9950
e-ISSN
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Volume of the periodical
98
Issue of the periodical within the volume
15
Country of publishing house
US - UNITED STATES
Number of pages
7
Pages from-to
"NESTRÁNKOVÁNO"
UT code for WoS article
000446820900006
EID of the result in the Scopus database
2-s2.0-85054573045