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Localized End States in Density Modulated Quantum Wires and Rings

Gangadharaiah, Suhas and Trifunovic, Luka and Loss, Daniel. (2012) Localized End States in Density Modulated Quantum Wires and Rings. Physical review letters, Vol. 108, H. 13 , 136803.

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Official URL: http://edoc.unibas.ch/dok/A6083499

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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.
Faculties and Departments:05 Faculty of Science > Departement Physik
05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Mesoscopics (Loss)
UniBasel Contributors:Loss, Daniel
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Physical Society
ISSN:0031-9007
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:10 Apr 2015 09:13
Deposited On:24 May 2013 09:02

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