Journal article

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
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.
Faculté des sciences et de médecine
Département de Physique
  • English
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