Enhancement of tunnel conductivity by Cooper pair fluctuations in electron-hole bilayer

D. K. Efimkin, Yu E. Lozovik

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Abstract

Influence of Cooper pair fluctuations that are precursor of pairing of electrons and holes located on opposite surfaces of topological insulator film on tunnel conductivity between the surfaces is investigated. Due to restrictions caused by momentum and energy conservation dependence of tunnel conductivity on external bias voltage has peak that becomes more prominent with decreasing of disorder and temperature. We have shown that Cooper pair fluctuations considerably enhance tunneling and height of the peak diverges in vicinity of critical temperature with critical index ν = 2. Width of the peak tends to zero in proximity of critical temperature. Pairing of electrons and holes can be suppressed by disorder and in vicinity of quantum critical point height of the peak also diverges as function of Cooper pair damping with critical index μ = 2.

Original languageEnglish
Title of host publicationProceedings
Volume393
DOIs
Publication statusPublished - 1 Jan 2012
Externally publishedYes
EventInternational Conference on Theoretical Physics: Dubna-Nano 2012 - Dubna, Russian Federation
Duration: 9 Jul 201214 Jul 2012

Publication series

NameJournal of Physics: Conference Series
PublisherIOP Publishing
ISSN (Print)1742-6588

Conference

ConferenceInternational Conference on Theoretical Physics: Dubna-Nano 2012
CountryRussian Federation
CityDubna
Period9/07/1214/07/12

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