Strain-induced superfluid transition for atoms on graphene

Abstract

Bosonic atoms deposited on atomically thin substrates represent a playground for exotic quantum many-body physics due to the highly-tunable, atomic-scale nature of the interaction potentials. The ability to engineer strong interparticle interactions can lead to the emergence of complex collective atomic states of matter, not possible in the context of dilute atomic gases confined in optical lattices. While it is known that the first layer of adsorbed helium on graphene is permanently locked into a solid phase, we show by a combination of quantum Monte Carlo and mean-field techniques, that simple isotropic graphene lattice expansion effectively unlocks a large variety of two-dimensional ordered commensurate, incommensurate, cluster atomic solid, and superfluid states for adsorbed atoms. It is especially significant that an atomically thin superfluid phase of matter emerges under experimentally feasible strain values, with potentially supersolid phases in close proximity on the phase diagram.

arXiv commentMain text: 12 pages and 5 figures. Supplementary Information: 3 pages and 3 figures. For associated data and code repository see: https://github.com/DelMaestroGroup/papers-code-Superfluid4HeStrainGraphene

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Cited by in corpus (6)

• Microscopic lattice model for quartic semi-Dirac fermions in two dimensions
• Phase diagram and crystal melting of helium-4 in two dimensions
• Efficient simulations of Hartree--Fock equations by an accelerated gradient descent method
• Combining Harmonic Sampling with the Worm Algorithm to Improve the Efficiency of Path Integral Monte Carlo
• Effects of substrate corrugation during helium adsorption on graphene in the grand canonical ensemble
• Accurate Helium-Benzene Potential: from CCSD(T) to Gaussian Process Regression