Stability and absence of a tower of states in ferrimagnets

Stability and absence of a tower of states in ferrimagnets
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亚铁磁体中状态塔的稳定性和不存在

DOI:
10.1103/physrevresearch.2.013304
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发表时间:
2020
影响因子:
4.2
通讯作者:
A.J. Beekman and J. van Wezel
A.J. Beekman and J. van Wezel
中科院分区:
--
文献类型:
--
作者:
L. Rademaker;A.J. Beekman and J. van Wezel

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反铁磁体和铁磁体是自发破缺连续对称性的两种不同(A型和B型)方式的原型。虽然B型南武-戈德斯通模式出现在各种系统中,但铁磁体被认为是病态的,因为它的稳定性和精确基态的破缺性质。然而,在这里,我们表明,在亚铁磁体的对称性破缺非常类似的铁磁体。特别是,有一个广泛的基态简并,没有安德森塔的状态,和最大极化的基态是磁稳定的。我们的结果是来自解析的Lieb-Mattis亚铁磁体和数值海森堡亚铁磁体。我们认为,这些属性是通用的B型破缺系统,序参数运营商是一个对称发电机。
Antiferromagnets and ferromagnets are archetypes of the two distinct (type-A and type-B) ways of spontaneously breaking a continuous symmetry. Although type-B Nambu-Goldstone modes arise in various systems, the ferromagnet was considered pathological due to the stability and symmetry-breaking nature of its exact ground state. However, here we show that symmetry breaking in ferrimagnets closely resembles the ferromagnet. In particular, there is an extensive ground-state degeneracy, there is no Anderson tower of states, and the maximally polarized ground state is thermodynamically stable. Our results are derived analytically for the Lieb-Mattis ferrimagnet and numerically for the Heisenberg ferrimagnet. We argue that these properties are generic for type-B symmetry-broken systems, where the order parameter operator is a symmetry generator.
DOI: 10.1016/j.aop.2015.07.008
发表时间: 2014
期刊: arXiv: Other Condensed Matter
影响因子: --
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