A new QMC estimator shows diverging superfluid density in the long-range 1d XY model as the interaction exponent alpha approaches zero.
(1), and defined j=i+rwithr∈[−(N−1)/2,(N−1)/2],r̸= 0 for the periodic chain withNodd, in the above equation
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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.