Using magnetic stripes to stabilize superfluidity in electron-hole double monolayer graphene

Abstract

Experiments have confirmed that double monolayer graphene cannot generate finite temperature electron-hole superfluidity. This has been shown to be due to very strong screening of the electron-hole pairing attraction. The linear dispersing energy bands in monolayer graphene prevent attempts to reduce the strength of the screening. We propose a new hybrid device in which the two sheets of monolayer graphene are placed in a modulated periodic perpendicular magnetic field. Such a magnetic field preserves the isotropic Dirac cones of the original monolayers but it reduces the slope of the cones so that the monolayer Fermi velocity $v_F$ is smaller. We show that with current experimental techniques, this reduction in $v_F$ can sufficiently weaken the screening to permit electron-hole superfluidity at measurable temperatures.

Revised version. MultiSuper collaboration: http://www.multisuper.org

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Cited by in corpus (6)

• Tuning electrical and optical anisotropy of a monolayer black phosphorus magnetic superlattice
• Theory of Coulomb Drag in Spatially Inhomogeneous Materials
• Tunable anisotropic behaviors in phosphorene under periodic potentials in arbitrary directions
• Electromagnetic properties of a double layer graphene system with electron-hole pairing
• Interplay of interlayer pairing and many-body screening in a bilayer of dipolar fermions
• Many-body electron correlations in graphene