Excited-State Phase Diagram of a Ferromagnetic Quantum Gas
- URL: http://arxiv.org/abs/2301.10655v3
- Date: Mon, 18 Dec 2023 06:57:57 GMT
- Title: Excited-State Phase Diagram of a Ferromagnetic Quantum Gas
- Authors: Bernd Meyer-Hoppe, Fabian Anders, Polina Feldmann, Luis Santos,
Carsten Klempt
- Abstract summary: We present the experimental determination of the excited-state phase diagram of an atomic ferromagnetic quantum gas.
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.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- 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.
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