Topological nematic phase transition in Kitaev magnets under applied magnetic fields
Topological nematic phase transition in Kitaev magnets under applied magnetic fields
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DOI：
10.1103/physrevresearch.3.023189
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发表时间：
2021-01
期刊：
影响因子：
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通讯作者：
Masahiro Takahashi;M. Yamada;Daichi Takikawa;T. Mizushima;S. Fujimoto
中科院分区：
文献类型：
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作者：
Masahiro Takahashi;M. Yamada;Daichi Takikawa;T. Mizushima;S. Fujimoto
我们提出了一个方案，实现复曲面码相位，这可能是容错量子计算，在候选材料的Kitaev磁铁。结果表明，在Kitaev自旋液态下，磁场和非Kitaev型交换作用诱导的Majorana费米子之间的四体相互作用，触发了无磁序的Majorana键的相变，伴随着Chern数从±1到零的变化.这种具有零陈数的有隙自旋的液体态就是复曲面码相。我们的结果可能解释最近通过热容测量在α-RuCl 3中观察到的拓扑结构跃迁[O. Tanaka等人，arXiv：2007.06757]。
We propose a scenario of realizing the toric code phase, which can be potentially utilized for faulttolerant quantum computation, in candidate materials of Kitaev magnets. It is demonstrated that four-body interactions among Majorana fermions in the Kitaev spin liquid state, which are induced by applied magnetic fields as well as non-Kitaev-type exchange interactions, trigger a nematic phase transition of Majorana bonds without magnetic orders, accompanying the change of the Chern number from ±1 to zero. This gapful spin liquid state with zero Chern number is nothing but the toric code phase. Our result potentially explains the topological nematic transition recently observed in α-RuCl3 via heat capacity measurements [O. Tanaka et al., arXiv:2007.06757].