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Deconfined classical criticality in the anisotropic quantum spin- 1 2 XY model on the square lattice

Journal Article · · Physical Review. B

The anisotropic quantum spin- 1 2 XY model on a linear chain was solved by Lieb, Schultz, and Mattis [] and shown to display a continuous quantum phase transition at the O(2) symmetric point separating two gapped phases with competing Ising long-range order. For the square lattice, the following is known. The two competing Ising ordered phases extend to finite temperatures, up to a boundary where a transition to the paramagnetic phase occurs, and meet at the O(2) symmetric critical line along the temperature axis that ends at a tricritical point at the Berezinskii-Kosterlitz-Thouless transition temperature where the two competing phases meet the paramagnetic phase. We show that the first-order zero-temperature (quantum) phase transition that separates the competing phases as a function of the anisotropy parameter is smoothed by thermal fluctuations into deconfined classical criticality.

Published by the American Physical Society 2025

Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-06ER46316
OSTI ID:
2526289
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 10 Vol. 111; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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