Reference : Dynamic response functions and helical gaps in interacting Rashba nanowires with and ...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
http://hdl.handle.net/10993/30167
Dynamic response functions and helical gaps in interacting Rashba nanowires with and without magnetic fields
English
Pedder, Christopher mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Meng, Tobias mailto [Technische Universit├Ąt Dresden > Institute of Theoretical Physics > > Postdoc]
Tiwari, Rakesh mailto [University of Basel > Condensed Matter Theory > > Postdoc]
Schmidt, Thomas mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
12-Dec-2016
Physical Review B
American Physical Society
94
24
245414
Yes (verified by ORBilu)
International
2469-9950
2469-9969
[en] Nanowires ; Rashba spin-orbit ; Helical gap
[en] A partially gapped spectrum due to the application of a magnetic field is one of the main probes of Rashba spin-orbit coupling in nanowires. Such a ``helical gap'' manifests itself in the linear conductance, as well as in dynamic response functions such as the spectral function, the structure factor, or the tunnelling density of states. In this paper, we investigate theoretically the signature of the helical gap in these observables with a particular focus on the interplay between Rashba spin-orbit coupling and electron-electron interactions. We show that in a quasi-one-dimensional wire, interactions can open a helical gap even without magnetic field. We calculate the dynamic response functions using bosonization, a renormalization group analysis, and the exact form factors of the emerging sine-Gordon model. For special interaction strengths, we verify our results by refermionization. We show how the two types of helical gaps, caused by magnetic fields or interactions, can be distinguished in experiments.
Fonds National de la Recherche - FnR
Researchers
http://hdl.handle.net/10993/30167
10.1103/PhysRevB.94.245414
http://journals.aps.org/prb/abstract/10.1103/PhysRevB.94.245414
FnR

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