Nonuniform electron-hole pairing in graphene bilayer

D. K. Efimkin; Yu E. Lozovik

doi:10.1080/00981389.2012.656536

Nonuniform electron-hole pairing in graphene bilayer

D. K. Efimkin, Yu E. Lozovik

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Abstract

Electron-hole (e-h) pairing caused by Coulomb interaction in the system of independently gated graphene layers is considered. The influence of the mismatch of concentrations of e and h and trigonal warping of their spectrum on critical temperature is studied. We predict the appearance of the state with finite value of Cooper pair momentum-Larkin-Ovchinnikov-Fulde-Ferrell-like (LOFF) state at mismatch of the concentrations of e and above the critical value. Internal Josephson effect in LOFF-like state caused by interlayer tunneling of e and h is considered. We suggest a new phase-sensitive experiment based on the internal Josephson effect for probing spatial structure of order parameter in a LOFF-like state.

Original language	English
Pages (from-to)	569-573
Number of pages	5
Journal	Fullerenes Nanotubes and Carbon Nanostructures
Volume	20
Issue number	4-7
DOIs	https://doi.org/10.1080/00981389.2012.656536
Publication status	Published - 1 May 2012
Externally published	Yes

Keywords

bilayer
Graphene
Josephson effect
nonuniform superconductivity

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10.1080/00981389.2012.656536

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AU - Lozovik, Yu E.

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AB - Electron-hole (e-h) pairing caused by Coulomb interaction in the system of independently gated graphene layers is considered. The influence of the mismatch of concentrations of e and h and trigonal warping of their spectrum on critical temperature is studied. We predict the appearance of the state with finite value of Cooper pair momentum-Larkin-Ovchinnikov-Fulde-Ferrell-like (LOFF) state at mismatch of the concentrations of e and above the critical value. Internal Josephson effect in LOFF-like state caused by interlayer tunneling of e and h is considered. We suggest a new phase-sensitive experiment based on the internal Josephson effect for probing spatial structure of order parameter in a LOFF-like state.

KW - bilayer

KW - Graphene

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Nonuniform electron-hole pairing in graphene bilayer

Abstract

Keywords

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