Nonthermal excitonic condensation near a spin-state transition

Nonthermal excitonic condensation near a spin-state transition
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自旋态转变附近的非热激子凝聚

DOI:
10.1103/physrevb.102.241103
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发表时间:
2020
期刊:
影响因子:
3.7
通讯作者:
Murakami Yuta
Murakami Yuta
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Werner Philipp;Murakami Yuta

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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.
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