## 抄録

We study response to a twist in the two-dimensional p-state clock model, which has the discrete Z_{p} symmetry. The response is measured in terms of helicity modulus, which is usually defined with respect to an infinitesimal twist. However, we demonstrate that such a definition is inappropriate for the clock model. The helicity modulus must be defined with respect to a finite, quantized twist which matches the discrete Z_{p} symmetry of the model. Numerical study of the appropriately defined helicity modulus resolves controversy over the clock model, showing the existence of two Berezinskii-Kosterlitz-Thouless transitions for p>4.

本文言語 | English |
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論文番号 | 104427 |

ジャーナル | Physical Review B - Condensed Matter and Materials Physics |

巻 | 88 |

号 | 10 |

DOI | |

出版ステータス | Published - 2013 9月 30 |

## ASJC Scopus subject areas

- 電子材料、光学材料、および磁性材料
- 凝縮系物理学

## フィンガープリント

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