Article (Scientific journals)
Helical gaps in interacting {Rashba} wires at low electron densities
Schmidt, Thomas; Pedder, Christopher
2016In Physical Review. B, Condensed Matter, 94, p. 125420
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Abstract :
[en] Rashba spin-orbit coupling and a magnetic field perpendicular to the Rashba axis have been predicted to open a partial gap (“helical gap”) in the energy spectrum of noninteracting or weakly interacting one-dimensional quantum wires. By comparing kinetic energy and Coulomb energy we show that this gap opening typically occurs at low electron densities where the Coulomb energy dominates. To address this strongly correlated limit, we investigate Rashba wires using Wigner crystal theory. We find that the helical gap exists even in the limit of strong interactions but its dependence on electron density differs significantly from the weakly interacting case. In particular, we find that the critical magnetic field for opening the gap becomes an oscillatory function of electron density. This changes strongly the expected signature of the helical gap in conductance measurements.
Disciplines :
Physics
Author, co-author :
Schmidt, Thomas ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Pedder, Christopher;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
External co-authors :
no
Language :
English
Title :
Helical gaps in interacting {Rashba} wires at low electron densities
Publication date :
2016
Journal title :
Physical Review. B, Condensed Matter
ISSN :
1095-3795
Publisher :
American Physical Society, New York, United States - Maryland
Volume :
94
Pages :
125420
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
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