Uncovering the nonequilibrium phase structure of an open quantum spin system
We experimentally and theoretically investigate the nonequilibrium phase structure of a well-controlled driven-dissipative quantum spin system governed by the interplay of coherent driving, spontaneous decay, and long-range spin-spin interactions. We discover that the rate of population loss provide...
Gespeichert in:
| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
6 August 2018
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| In: |
Physical review
Year: 2018, Jahrgang: 98, Heft: 2 |
| ISSN: | 2469-9934 |
| DOI: | 10.1103/PhysRevA.98.022109 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1103/PhysRevA.98.022109 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevA.98.022109 
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| Verfasserangaben: | S. Helmrich, A. Arias, and S. Whitlock |
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| 520 | |a We experimentally and theoretically investigate the nonequilibrium phase structure of a well-controlled driven-dissipative quantum spin system governed by the interplay of coherent driving, spontaneous decay, and long-range spin-spin interactions. We discover that the rate of population loss provides a convenient macroscopic observable that exhibits power-law scaling with the driving strength over several orders of magnitude. The measured scaling exponents reflect the underlying nonequilibrium phase structure of the many-body system, which includes dissipation-dominated, paramagnetic, and critical regimes as well as an instability which drives the system towards states with high excitation density. This opens up a means to study and classify quantum systems out of equilibrium and extends the domain where scale-invariant behavior may be found in nature. | ||
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