Abstract
We study the critical properties of the superfluid-insulator transition in the fully-frustrated quantum rotor model at commensurate filling in two dimensions. By developing a large-N method that is applicable to the model with frustration, we find the finite-size scaling properties in the spherical limit, from which the correlation length critical exponent ? = 1.0 and the dynamical critical exponent z = 1 are confirmed. A universal sheet resistance of Rc/R0 = 1.25(1) at the critical point, where R0 is the quantum resistance, is obtained, which is consistent with the theoretical prediction.
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