Superfluidity of dipole excitons in two layers of gapped graphene

Abstract

A study of the formation of excitons as a problem of two Dirac particles confined in two-layer graphene sheets separated by a dielectric when gaps are opened and they interact via a Coulomb potential is presented. We propose to observe Bose-Einstein condensation and superfluidity of quasi-two-dimensional dipole excitons in double layer graphene in the presence of band gaps. The energy spectrum of the collective excitations, the sound spectrum, and the effective exciton mass are functions of the energy gaps, density and interlayer separation. The superfluid density ns and temperature of the Kosterlitz-Thouless phase transition Tc are decreasing functions of the energy gaps as well as the interlayer separation, and therefore, could be controlled by these parameters.

12 pages, 3 figures

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• Optical Absorption by Dirac Excitons in Single-Layer Transition-Metal Dichalcogenides
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• Coupling of two Dirac particles
• On the Optical Properties of Excitons in Buckled 2D Materials in an External Electric Field
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• Strong Valley Zeeman Effect of Dark Excitons in Monolayer Transition Metal Dichalcogenides in a Tilted Magnetic Field
• Complexes of dipolar excitons in layered quasi-two-dimensional nanostructures
• Spontaneously Broken Particle-Hole Symmetry in Photonic Graphene with Gain and Loss
• Turbulence in a Bose-Einstein Condensate of Dipolar Excitons in Coupled Quantum Wells
• Spectrum of exciton states in monolayer transition metal dichalcogenides: angular momentum and Landau levels
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• On superfluidity of indirect excitons in transition metals trichalcogenides van der Waals heterostructures
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