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arXiv 0907.1076cond-mat.stat-mech
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经典和量子各向异性海森堡反铁磁体

Classical and quantum anisotropic Heisenberg antiferromagnets

W. Selke, G. Bannasch, M. Holtschneider, I. P. McCulloch, D. Peters, S. Wessel

摘要:

本文研究了具有XXZ型交换各向异性的经典和量子海森堡反铁磁体,以及场中二次和三次单离子项的晶体场。磁体显示出各种相,包括自旋翻转(或在量子情况下,自旋液体)和双锥(对应于量子格子气描述中的超固体)相。应用基态考虑、Monte Carlo和密度矩阵重整化群方法,分析了量子效应和晶格维数的影响。有趣的临界和多临界行为可能发生在量子和热相变。

英文摘要:

We study classical and quantum Heisenberg antiferromagnets with exchange anisotropy of XXZ-type and crystal field single-ion terms of quadratic and cubic form in a field. The magnets display a variety of phases, including the spin-flop (or, in the quantum case, spin-liquid) and biconical (corresponding, in the quantum lattice gas description, to supersolid) phases. Applying ground-state considerations, Monte Carlo and density matrix renormalization group methods, the impact of quantum effects and lattice dimension is analysed. Interesting critical and multicritical behaviour may occur at quantum and thermal phase transitions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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