Report
Kramers' degeneracy for open systems in thermal equilibrium
| العنوان: | Kramers' degeneracy for open systems in thermal equilibrium |
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| المؤلفون: | Lieu, Simon, McGinley, Max, Shtanko, Oles, Cooper, Nigel R., Gorshkov, Alexey V. |
| سنة النشر: | 2021 |
| المجموعة: | Condensed Matter Quantum Physics |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Quantum Gases, Condensed Matter - Strongly Correlated Electrons, Quantum Physics |
| الوصف: | Kramers' degeneracy theorem underpins many interesting effects in quantum systems with time-reversal symmetry. We show that the generator of dynamics for Markovian open fermionic systems can exhibit an analogous degeneracy, protected by a combination of time-reversal symmetry and the microreversibility (detailed balance) property of systems at thermal equilibrium -- the degeneracy is lifted if either condition is not met. We provide simple examples of this phenomenon and show that the degeneracy is reflected in the single-particle Green's functions. Furthermore, we show that certain experimental signatures of topological edge modes in open many-body systems can be protected by microreversibility in the same way. Our results highlight the importance of detailed balance in characterizing open topological matter. |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.105.L121104 |
| URL الوصول: | http://arxiv.org/abs/2105.02888 |
| رقم الانضمام: | edsarx.2105.02888 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.105.L121104 |
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