Details
| Original language | English |
|---|---|
| Article number | 230602 |
| Journal | Physical review letters |
| Volume | 126 |
| Issue number | 23 |
| Publication status | Published - 10 Jun 2021 |
Abstract
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.
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In: Physical review letters, Vol. 126, No. 23, 230602, 10.06.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Interferometric Order Parameter for Excited-State Quantum Phase Transitions in Bose-Einstein Condensates
AU - Feldmann, Polina
AU - Klempt, Carsten
AU - Smerzi, Augusto
AU - Santos, Luis
AU - Gessner, Manuel
N1 - Funding Information: We thank Dmytro Bondarenko, Pavel Cejnar, Ignacio Cirac, and Reinhard Werner for valuable discussions. We acknowledge support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under the SFB 1227 “DQ-mat”, project A02, and under Germany’s Excellence Strategy—EXC-2123 QuantumFrontiers—390837967, and by the LabEx ENS-ICFP: ANR-10-LABX-0010/ANR-10-IDEX-0001-02 PSL*.
PY - 2021/6/10
Y1 - 2021/6/10
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85108174816&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.126.230602
DO - 10.1103/PhysRevLett.126.230602
M3 - Article
C2 - 34170156
AN - SCOPUS:85108174816
VL - 126
JO - Physical review letters
JF - Physical review letters
SN - 0031-9007
IS - 23
M1 - 230602
ER -