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Localized End States in Density Modulated Quantum Wires and Rings
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 1544675
Author(s) Gangadharaiah, Suhas; Trifunovic, Luka; Loss, Daniel
Author(s) at UniBasel Loss, Daniel
Year 2012
Title Localized End States in Density Modulated Quantum Wires and Rings
Journal Physical Review Letters
Volume 108
Number 13
Pages / Article-Number 136803
Abstract We study finite quantum wires and rings in the presence of a charge-density wave gap induced by a periodic modulation of the chemical potential. We show that the Tamm-Shockley bound states emerging at the ends of the wire are stable against weak disorder and interactions, for discrete open chains and for continuum systems. The low-energy physics can be mapped onto the Jackiw-Rebbi equations describing massive Dirac fermions and bound end states. We treat interactions via the continuum model and show that they increase the charge gap and further localize the end states. The electrons placed in the two localized states on the opposite ends of the wire can interact via exchange interactions and this setup can be used as a double quantum dot hosting spin qubits. The existence of these states could be experimentally detected through the presence of an unusual 4 pi Aharonov-Bohm periodicity in the spectrum and persistent current as a function of the external flux.
Publisher American Physical Society
ISSN/ISBN 0031-9007 ; 1079-7114
URL https://link.aps.org/accepted/10.1103/PhysRevLett.108.136803
edoc-URL http://edoc.unibas.ch/dok/A6083499
Full Text on edoc No
Digital Object Identifier DOI 10.1103/PhysRevLett.108.136803
PubMed ID http://www.ncbi.nlm.nih.gov/pubmed/22540720
ISI-Number 000302019600010
Document type (ISI) Journal Article
 
   

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