Topological Lattice Actions for the 2d XY Model
arXiv:1212.0579 · doi:10.1007/JHEP03(2013)141
Abstract
We consider the 2d XY Model with topological lattice actions, which are invariant against small deformations of the field configuration. These actions constrain the angle between neighbouring spins by an upper bound, or they explicitly suppress vortices (and anti-vortices). Although topological actions do not have a classical limit, they still lead to the universal behaviour of the Berezinskii-Kosterlitz-Thouless (BKT) phase transition - at least up to moderate vortex suppression. Thus our study underscores the robustness of universality, which persists even when basic principles of classical physics are violated. In the massive phase, the analytically known Step Scaling Function (SSF) is reproduced in numerical simulations. In the massless phase, the BKT value of the critical exponent eta_c is confirmed. Hence, even though for some topological actions vortices cost zero energy, they still drive the standard BKT transition. In addition we identify a vortex-free transition point, which deviates from the BKT behaviour.
22 pages, LaTex, 7 figures, 7 tables, error in Section 4 corrected
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- Topological Lattice Actions
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Cited by in corpus (7)
- Quantitative analysis of phase transitions in two-dimensional XY models using persistent homology
- Berezinskii-Kosterlitz-Thouless Transition with a Constraint Lattice Action
- Topological Susceptibility from Slabs
- Asymptotic Freedom at the Berezinskii-Kosterlitz-Thouless Transition without Fine-Tuning Using a Qubit Regularization
- Non-abelian lattice gauge theory with a topological action
- From hard spheres to hard-core spins
- Non-Abelian vortex in lattice gauge theory