Interferometric Order Parameter for Excited-State Quantum Phase Transitions in Bose-Einstein Condensates

被引:28
|
作者
Feldmann, Polina [1 ]
Klempt, Carsten [2 ,3 ]
Smerzi, Augusto [4 ]
Santos, Luis [1 ]
Gessner, Manuel [5 ]
机构
[1] Leibniz Univ Hannover, Inst Theoret Phys, Appelstr 2, D-30167 Hannover, Germany
[2] Leibniz Univ Hannover, Inst Quantenopt, Welfengarten 1, D-30167 Hannover, Germany
[3] Leibniz Univ Hannover, Deutsch Zentrum Luft & Raumfahrt eV DLR, DLR SI, Inst Satellitengeodasie & Inertialsensor, Callinstr 36, D-30167 Hannover, Germany
[4] CNR, INO, QSTAR, Largo Enrico Fermi 2, I-50125 Florence, Italy
[5] Sorbonne Univ, Coll France, Univ PSL, Lab Kastler Brossel,ENS,CNRS, 24 Rue Lhomond, F-75005 Paris, France
关键词
MONODROMY; DYNAMICS; SYSTEMS;
D O I
10.1103/PhysRevLett.126.230602
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Excited-state quantum phase transitions extend the notion of quantum phase transitions beyond the ground state. They are characterized by closing energy gaps amid the spectrum. Identifying order parameters for excited-state quantum phase transitions poses, however, a major challenge. We introduce a topological order parameter that distinguishes excited-state phases in a large class of mean-field models and can be accessed by interferometry in current experiments with spinor Bose-Einstein condensates. Our work opens a way for the experimental characterization of excited-state quantum phases in atomic many-body systems.
引用
收藏
页数:6
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