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arXiv 1104.1792cond-mat.stat-mech
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二维平面上磁偶极子的Kosterlitz-Less跃迁

Kosterlitz-Thouless transition of magnetic dipoles on the two-dimensional plane

Seung Ki Baek, Petter Minnhagen, Beom Jun Kim

摘要:

一个相变的普适类通常由维数和固有对称性等因素决定。我们研究了磁偶极子系统,其中基态对称性和基本的晶格结构以一种复杂的方式相互耦合。二维正方晶格磁偶极子系统经历属于二维伊辛普适类的有序-无序相变。根据Prakash和Henley [Phys. Rev. B { \bf 42},6572(1990)],这可能与四重对称基态有关,这表明与四态时钟模型相似。假设这种对称连接成立,蜂窝晶格上的磁偶极子,具有六重对称的基态,应该表现出与六态时钟模型一致的Kosterlitz-numerless跃迁。这是通过在本调查中的数值模拟验证。然而,有人指出,这种对称性的论点并不总是适用,这表明,对称性以外的因素可以是决定性的普遍性类的磁偶极子系统。

英文摘要:

The universality class of a phase transition is often determined by factors like dimensionality and inherent symmetry. We study the magnetic dipole system in which the ground-state symmetry and the underlying lattice structure are coupled to each other in an intricate way. A two-dimensional (2D) square-lattice system of magnetic dipoles undergoes an order-disorder phase transition belonging to the 2D Ising universality class. According to Prakash and Henley [Phys. Rev. B {\bf 42}, 6572 (1990)], this can be related to the fourfold-symmetric ground states which suggests a similarity to the four-state clock model. Provided that this type of symmetry connection holds true, the magnetic dipoles on a honeycomb lattice, which possess sixfold-symmetric ground states, should exhibit a Kosterlitz-Thouless transition in accordance with the six-state clock model. This is verified through numerical simulations in the present investigation. However, it is pointed out that this symmetry argument does not always apply, which suggests that factors other than symmetry can be decisive for the universality class of the magnetic dipole system.

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