Nonthermal excitonic condensation near a spin-state transition
- Werner, Philipp Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland
- Murakami, Yuta Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
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04.12.2020
Published in:
- Physical Review B. - 2020, vol. 102, no. 2020-24, p. 241103
English
Recent experiments demonstrate the induction of long-range order in correlated electron systems via external perturbations, which calls for a better understanding of nonthermal ordered states and nonequilibrium symmetry breaking. Here, we reveal a mechanism based on entropy cooling and entropy trapping in a strongly correlated multiorbital system. We consider a two-orbital Hubbard model with Hund coupling and crystal-field splitting and show that in the vicinity of a spin-state transition, crystal-field quenches can induce an excitonic condensation at initial temperatures above the highest ordering temperature in equilibrium. We furthermore identify a dynamical phase transition in the evolution of the order parameter and show that such quenches can result in long-lived nonthermal excitonic condensates which have no analog in the equilibrium phase diagram.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 329951
- DOI 10.1103/PhysRevB.102.241103
- Persistent URL
- https://folia.unifr.ch/unifr/documents/309124
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