DMRG study of the Berezinskii-Kosterlitz-Thouless transitions of the 2D five-state clock model

Abstract

The two Berezinskii-Kosterlitz-Thouless phase transitions of the two-dimensional 5-state clock model are studied on infinite strips using the DMRG algorithm. Because of the open boundary conditions, the helicity modulus ${{\rm Y}}_2$ is computed by imposing twisted magnetic fields at the two boundaries. Its scaling behavior is in good agreement with the existence of essential singularities with $\sigma =1/2$ at the two transitions. The predicted universal values of ${{\rm Y}}_2$ are shown to be reached in the thermodynamic limit. The fourth-order helicity modulus is observed to display a dip at the high-temperature BKT transition, like the XY model, and shown to take a new universal value at the low-temperature one. Finally, the scaling behavior of magnetization at the low-temperature transition is compatible with $\eta =1/4$.

12 pages, 13 figures

References in corpus (3)

• DMRG studies of critical SU(N) spin chains
• Non-Kosterlitz-Thouless transitions for the $q$-state clock models
• Direct Evidence of the Discontinuous Character of the Kosterlitz-Thouless Jump

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