Details
| Original language | English |
|---|---|
| Article number | 243402 |
| Journal | Physical Review Letters |
| Volume | 131 |
| Issue number | 24 |
| Early online date | 13 Dec 2023 |
| Publication status | Published - Dec 2023 |
Abstract
Keywords
- cond-mat.quant-gas, physics.atom-ph, quant-ph
ASJC Scopus subject areas
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In: Physical Review Letters, Vol. 131, No. 24, 243402, 12.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Excited-State Phase Diagram of a Ferromagnetic Quantum Gas
AU - Meyer-Hoppe, Bernd
AU - Anders, Fabian
AU - Feldmann, Polina
AU - Santos, Luis
AU - Klempt, Carsten
N1 - We thank A. Smerzi, L. Pezz`e, and M. Gessner for inspiring discussions. We acknowledge financial support from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—Project-ID 274200144—SFB 1227 DQ-mat within the project A02 and under Germany’s Excellence Strategy EXC-2123 QuantumFrontiers—390837967. F. A. and B. M.-H. acknowledge support from the Hannover School for Nanotechnology (HSN). P. F. acknowledges support from the Canada First Research Excellence Fund, Quantum Materials and Future Technologies Program. B.M.-H. and F. A. performed the experiments. B. M.-H., F. A., and P. F. analyzed the data. C. K. and L. S. conceived and designed the experiments with all authors contributing. The manuscript was written by all authors.
PY - 2023/12
Y1 - 2023/12
N2 - The ground-state phases of a quantum many-body system are characterized by an order parameter, which changes abruptly at quantum phase transitions when an external control parameter is varied. Interestingly, these concepts may be extended to excited states, for which it is possible to define equivalent excited-state quantum phase transitions. However, the experimental mapping of a phase diagram of excited quantum states has not yet been demonstrated. Here we present the experimental determination of the excited-state phase diagram of an atomic ferromagnetic quantum gas, where, crucially, the excitation energy is one of the control parameters. The obtained phase diagram exemplifies how the extensive Hilbert state of quantum many-body systems can be structured by the measurement of well-defined order parameters.
AB - The ground-state phases of a quantum many-body system are characterized by an order parameter, which changes abruptly at quantum phase transitions when an external control parameter is varied. Interestingly, these concepts may be extended to excited states, for which it is possible to define equivalent excited-state quantum phase transitions. However, the experimental mapping of a phase diagram of excited quantum states has not yet been demonstrated. Here we present the experimental determination of the excited-state phase diagram of an atomic ferromagnetic quantum gas, where, crucially, the excitation energy is one of the control parameters. The obtained phase diagram exemplifies how the extensive Hilbert state of quantum many-body systems can be structured by the measurement of well-defined order parameters.
KW - cond-mat.quant-gas
KW - physics.atom-ph
KW - quant-ph
UR - http://www.scopus.com/inward/record.url?scp=85179621643&partnerID=8YFLogxK
U2 - 10.48550/arXiv.2301.10655
DO - 10.48550/arXiv.2301.10655
M3 - Article
VL - 131
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 24
M1 - 243402
ER -