Difference between revisions of "Arxiv Selection Nov 2019"
Lizehan2008 (talk | contribs) (Created page with "Nov 1-Nov 7 Zehan Li, Nov 8- Nov 14 Jiansong Pan, Nov 15- Nov 21 Ahmet Keles, Nov 22 - Nov 28 Haiping Hu") |
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Nov 1-Nov 7 Zehan Li, Nov 8- Nov 14 Jiansong Pan, Nov 15- Nov 21 Ahmet Keles, Nov 22 - Nov 28 Haiping Hu | Nov 1-Nov 7 Zehan Li, Nov 8- Nov 14 Jiansong Pan, Nov 15- Nov 21 Ahmet Keles, Nov 22 - Nov 28 Haiping Hu | ||
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+ | arXiv:1910.14606 (cross-list from cond-mat.mes-hall) [pdf, other] | ||
+ | |||
+ | Non-Hermitian topological phase transitions for quantum spin Hall insulators | ||
+ | |||
+ | Junpeng Hou, Ya-Jie Wu, Chuanwei Zhang | ||
+ | |||
+ | Comments: 10 pages, 9 figures | ||
+ | |||
+ | Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Quantum Gases (cond-mat.quant-gas); Optics (physics.optics) | ||
+ | |||
+ | The interplay between non-Hermiticity and topology opens an exciting avenue for engineering | ||
+ | novel topological matter with unprecedented properties. While previous studies have mainly focused | ||
+ | on one-dimensional systems or Chern insulators, here we investigate topological phase transitions | ||
+ | to/from quantum spin Hall (QSH) insulators driven by non-Hermiticity. We show that a trivial to | ||
+ | QSH insulator phase transition can be induced by solely varying non-Hermitian terms, and there | ||
+ | exists exceptional edge arcs in QSH phases. We establish two topological invariants for characterizing | ||
+ | the non-Hermitian phase transitions: i) with time-reversal symmetry, the biorthogonal Z2 invariant | ||
+ | based on non-Hermitian Wilson loops, and ii) without time-reversal symmetry, a biorthogonal spin | ||
+ | Chern number through biorthogonal decompositions of the Bloch bundle of the occupied bands. | ||
+ | These topological invariants can be applied to a wide class of non-Hermitian topological phases | ||
+ | beyond Chern classes, and provides a powerful tool for exploring novel non-Hermitian topological | ||
+ | matter and their device applications. |
Revision as of 20:26, 1 November 2019
Nov 1-Nov 7 Zehan Li, Nov 8- Nov 14 Jiansong Pan, Nov 15- Nov 21 Ahmet Keles, Nov 22 - Nov 28 Haiping Hu
arXiv:1910.14606 (cross-list from cond-mat.mes-hall) [pdf, other]
Non-Hermitian topological phase transitions for quantum spin Hall insulators
Junpeng Hou, Ya-Jie Wu, Chuanwei Zhang
Comments: 10 pages, 9 figures
Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Quantum Gases (cond-mat.quant-gas); Optics (physics.optics)
The interplay between non-Hermiticity and topology opens an exciting avenue for engineering novel topological matter with unprecedented properties. While previous studies have mainly focused on one-dimensional systems or Chern insulators, here we investigate topological phase transitions to/from quantum spin Hall (QSH) insulators driven by non-Hermiticity. We show that a trivial to QSH insulator phase transition can be induced by solely varying non-Hermitian terms, and there exists exceptional edge arcs in QSH phases. We establish two topological invariants for characterizing the non-Hermitian phase transitions: i) with time-reversal symmetry, the biorthogonal Z2 invariant based on non-Hermitian Wilson loops, and ii) without time-reversal symmetry, a biorthogonal spin Chern number through biorthogonal decompositions of the Bloch bundle of the occupied bands. These topological invariants can be applied to a wide class of non-Hermitian topological phases beyond Chern classes, and provides a powerful tool for exploring novel non-Hermitian topological matter and their device applications.