Interlayer excitons with tunable dispersion relation

Abstract

Interlayer excitons, comprising an electron in one material bound by Coulomb attraction to a hole in an adjacent material, are composite bosons that can assume a variety of many-body phases. The phase diagram of the bosonic system is largely determined by the dispersion relation of the bosons, which itself arises as a combination of the dispersion relations of the electron and hole separately. Here I show that in situations where either the electron or the hole has a non-monotonic, "Mexican hat-shaped" dispersion relation, the exciton dispersion relation can have a range of qualitatively different forms, each corresponding to a different many-body phase at low temperature. This diversity suggests a novel platform for continuously tuning between different quantum phases using an external field.

5+2 pages, 5 figures

References in corpus (13)

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Cited by in corpus (9)

• Quantum Hall Drag of Exciton Superfluid in Graphene
• Interlayer excitons and Band Alignment in MoS${}_2$/hBN/WSe${}_2$ van der Waals Heterostructures
• Crossover from weakly indirect to direct excitons in atomically thin films of InSe
• Excitons without effective mass: biased bilayer graphene
• Chiral Wigner crystal phases induced by Berry curvature
• $\mathcal{N}=2$ supersymmetry and anisotropic scale invariance
• Wigner crystallization at large fine structure constant
• Effect of exciton-phonon coupling on the interlayer excitons in transition metal dichalcogenides double layers
• Brightening dark excitons and trions in systems with a Mexican-hat energy dispersion: example of InSe