Reference : 8pi-periodic Josephson effect in time-reversal invariant interacting Rashba nanowires
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Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/24243
8pi-periodic Josephson effect in time-reversal invariant interacting Rashba nanowires
English
Pedder, Christopher mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Meng, Tobias [Technical University of Dresden]
Tiwari, Rakesh [University of Basel]
Schmidt, Thomas mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Jul-2015
No
[en] We investigate narrow quantum wires with strong Rashba spin-orbit coupling and electron-electron interactions. We show that virtual transitions between subbands lead to umklapp scattering which can open a partial gap in the spectrum even in the presence of time-reversal symmetry. Using the superconducting proximity effect to gap out the remaining modes, we show that the system can host zero-energy states at its edges, which are protected by time-reversal symmetry. We present the parameter regime in which these bound states will emerge. Similarly to Majorana bound states, they will produce a zero-bias peak in the differential conductance. In contrast to the Majorana fermions, however, their fourfold degeneracy leads to an 8π periodicity of the Josephson current due to tunneling of fractionalized excitations with charge e/2.
Fonds National de la Recherche - FnR
http://hdl.handle.net/10993/24243
http://arxiv.org/abs/1507.08881

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