Simultaneous fermion and exciton condensations from a model Hamiltonian
Simultaneous fermion and exciton condensations from a model Hamiltonian
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DOI：
10.1103/physrevb.105.035143
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发表时间：
2022-01
影响因子：
3.7
通讯作者：
LeeAnn M. Sager;D. Mazziotti
中科院分区：
文献类型：
--
作者：
LeeAnn M. Sager;D. Mazziotti
费米子-激子凝聚，其中费米子对（即，超导性）和激子凝聚在单个相干量子态中同时发生最近被推测存在。在这里，我们捕获的费米子激子凝聚通过模型哈密顿量，可以重新创建这类新的高度相关的凝聚现象的物理。我们证明了哈密顿量产生的费米子对和激子凝聚的一系列状态与粒子数增加的大本征值签名。结果证实了我们在热力学极限下预言的双凝聚体波函数是由费米子对和激子波函数的纠缠引起的。这个模型哈密顿--推广了超导或激子凝聚的著名模型哈密顿--可以探索各种各样的凝聚行为。它为产生费米子-激子凝聚体所需的力提供了重要的见解，这对于在从超导体到激子材料的实际材料中实现这种凝聚可能是非常宝贵的。
Fermion-exciton condensation in which both fermion-pair (i.e., superconductivity) and exciton condensations occur simultaneously in a single coherent quantum state has recently been conjectured to exist. Here, we capture the fermion-exciton condensation through a model Hamiltonian that can recreate the physics of this new class of highly correlated condensation phenomena. We demonstrate that the Hamiltonian generates the large-eigenvalue signatures of fermion-pair and exciton condensations for a series of states with increasing particle numbers. The results confirm that the dual-condensate wave function arises from the entanglement of fermion-pair and exciton wave functions, which we previously predicted in the thermodynamic limit. This model Hamiltonian -- generalizing well-known model Hamiltonians for either superconductivity or exciton condensation -- can explore a wide variety of condensation behavior. It provides significant insights into the required forces for generating a fermion-exciton condensate, which will likely be invaluable for realizing such condensations in realistic materials with applications from superconductors to excitonic materials.