首页|4He monolayer on graphene:a quantum Monte Carlo study
4He monolayer on graphene:a quantum Monte Carlo study
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We revisit the problem of adsorption of a single 4He layer on graphene,focusing on the commensurate(C1/3)crystalline phase,specifically on whether it may possess a nonzero superfluid response,and on the existence of superfluid phases,either(metastable)liquid or vacancy-doped crystalline.We make use of canonical quantum Monte Carlo simulations at zero and finite temperature,based on a realistic microscopic model of the system.Our results confirm the absence of any superfluid response in the commensurate crystal,and that no thermodynamically stable uniform phase exists at lower coverage.No evidence of a possibly long-lived,metastable superfluid phase at C1/3 coverage is found.Altogether,the results of ground-state projection methods and finite-temperature simulations are entirely consistent.
superfluiditylow-dimensional systemsquantum Monte Carloheliumsupersolids
S Yu、M Boninsegni
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Department of Physics,University of Alberta,Edmonton,Alberta T6G 2H5,Canada
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