Topological phases of the two-leg Kitaev ladder

Ning Wu

doi:10.1016/j.physleta.2012.10.016

Topological phases of the two-leg Kitaev ladder

Ning Wu^*

^*此作品的通讯作者

Tsinghua University

科研成果: 期刊稿件 › 文章 › 同行评审

31 引用（Scopus）

摘要

We study the phase diagram of the two-leg Kitaev model. Different topological phases can be characterized by either the number of Majorana modes for a deformed chain of the open ladder, or by a winding number related to the 'h-loop' in the momentum space. By adding a three-spin interaction term to break the time-reversal symmetry, two originally different phases are glued together, so that the number of Majorana modes reduce to 0 or 1, namely, the topological invariant collapses to ^Z2 from an integer Z. These observations are consistent with a recent general study [S. Tewari, J.D. Sau, arXiv:1111.6592v2].

源语言	英语
页（从-至）	3530-3534
页数	5
期刊	Physics Letters, Section A: General, Atomic and Solid State Physics
卷	376
期	46
DOI	https://doi.org/10.1016/j.physleta.2012.10.016
出版状态	已出版 - 15 10月 2012
已对外发布	是

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abstract = "We study the phase diagram of the two-leg Kitaev model. Different topological phases can be characterized by either the number of Majorana modes for a deformed chain of the open ladder, or by a winding number related to the 'h-loop' in the momentum space. By adding a three-spin interaction term to break the time-reversal symmetry, two originally different phases are glued together, so that the number of Majorana modes reduce to 0 or 1, namely, the topological invariant collapses to Z2 from an integer Z. These observations are consistent with a recent general study [S. Tewari, J.D. Sau, arXiv:1111.6592v2].",

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AB - We study the phase diagram of the two-leg Kitaev model. Different topological phases can be characterized by either the number of Majorana modes for a deformed chain of the open ladder, or by a winding number related to the 'h-loop' in the momentum space. By adding a three-spin interaction term to break the time-reversal symmetry, two originally different phases are glued together, so that the number of Majorana modes reduce to 0 or 1, namely, the topological invariant collapses to Z2 from an integer Z. These observations are consistent with a recent general study [S. Tewari, J.D. Sau, arXiv:1111.6592v2].

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KW - Topological invariants

KW - Topological transitions

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JF - Physics Letters, Section A: General, Atomic and Solid State Physics

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Topological phases of the two-leg Kitaev ladder

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