A new QMC estimator shows diverging superfluid density in the long-range 1d XY model as the interaction exponent alpha approaches zero.
We can approximateρ s using finite differences as follows: ρs = lim θ→0 2 N ⟨H(θ)⟩ − ⟨H(0)⟩ θ2 .(A9) Here, the expectation values are evaluated in the ground state
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Superfluidity in the spin-1/2 XY model with power-law interactions
A new QMC estimator shows diverging superfluid density in the long-range 1d XY model as the interaction exponent alpha approaches zero.