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arXiv 2011.08263cond-mat.mes-hall
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超导体拓扑跃迁的最小塞曼场要求

Minimal Zeeman field requirement for a topological transition in superconductors

Kim Pöyhönen, Daniel Varjas, Michael Wimmer, Anton R. Akhmerov

摘要:

创造马约拉纳准粒子的平台依赖于超导性和时间反演对称性的破缺。通过研究已知平凡态的连续变形,我们发现超导配对和时间反演破缺之间的关系对系统的拓扑结构施加了严格的限制。应用这些界限与塞曼场的$s$波系统,我们得出结论,拓扑相变要求塞曼能量至少局部超过超导配对的能隙的完整的哈密顿量。我们的结果是独立的几何形状和维数的系统。

英文摘要:

Platforms for creating Majorana quasiparticles rely on superconductivity and breaking of time-reversal symmetry. By studying continuous deformations to known trivial states, we find that the relationship between superconducting pairing and time reversal breaking imposes rigorous bounds on the topology of the system. Applying these bounds to $s$-wave systems with a Zeeman field, we conclude that a topological phase transition requires that the Zeeman energy at least locally exceed the superconducting pairing by the energy gap of the full Hamiltonian. Our results are independent of the geometry and dimensionality of the system.

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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