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

被引：30

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

来源：

PHYSICAL REVIEW LETTERS | 2021年 / 126卷 / 23期

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

页数：6

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