Excited-State Phase Diagram of a Ferromagnetic Quantum Gas

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Autoren

  • Bernd Meyer-Hoppe
  • Fabian Anders
  • Polina Feldmann
  • Luis Santos
  • Carsten Klempt

Organisationseinheiten

Externe Organisationen

  • University of British Columbia
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Aufsatznummer243402
FachzeitschriftPhysical Review Letters
Jahrgang131
Ausgabenummer24
Frühes Online-Datum13 Dez. 2023
PublikationsstatusVeröffentlicht - Dez. 2023

Abstract

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.

ASJC Scopus Sachgebiete

Zitieren

Excited-State Phase Diagram of a Ferromagnetic Quantum Gas. / Meyer-Hoppe, Bernd; Anders, Fabian; Feldmann, Polina et al.
in: Physical Review Letters, Jahrgang 131, Nr. 24, 243402, 12.2023.

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Meyer-Hoppe B, Anders F, Feldmann P, Santos L, Klempt C. Excited-State Phase Diagram of a Ferromagnetic Quantum Gas. Physical Review Letters. 2023 Dez;131(24):243402. Epub 2023 Dez 13. doi: 10.48550/arXiv.2301.10655, 10.1103/PhysRevLett.131.243402
Meyer-Hoppe, Bernd ; Anders, Fabian ; Feldmann, Polina et al. / Excited-State Phase Diagram of a Ferromagnetic Quantum Gas. in: Physical Review Letters. 2023 ; Jahrgang 131, Nr. 24.
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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.

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