Kramers' degeneracy for open systems in thermal equilibrium
Source abstract
Abstract
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.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Quantum Mechanics and Non-Hermitian Physics · Quantum many-body systems · Topological Materials and Phenomena
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Joint Quantum Institute, NIST/University of Maryland, College Park, Maryland 20742, USA
Joint Center for Quantum Information and Computer Science, NIST/University of Maryland, College Park, Maryland 20742, USA
Rudolf Peierls Centre for Theoretical Physics, Clarendon Laboratory, Oxford OX1 3PU, United Kingdom
TCM Group, Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom
Department of Physics and Astronomy, University of Florence, Via G. Sansone 1, Sesto Fiorentino 50019, Italy
Funding
Engineering and Physical Sciences Research Council · U.S. Department of Energy · Army Research Office · Simons Foundation
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