Observation of a Transition Between Dynamical Phases in a Quantum Degenerate Fermi Gas
| Autor: | Smale, Scott, He, Peiru, Olsen, Ben A., Jackson, Kenneth G., Sharum, Haille, Trotzky, Stefan, Marino, Jamir, Rey, Ana Maria, Thywissen, Joseph H. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Science Advances 5, eaax1568 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1126/sciadv.aax1568 |
| Popis: | A proposed paradigm for out-of-equilibrium quantum systems is that an analogue of quantum phase transitions exists between parameter regimes of qualitatively distinct time-dependent behavior. Here, we present evidence of such a transition between dynamical phases in a cold-atom quantum simulator of the collective Heisenberg model. Our simulator encodes spin in the hyperfine states of ultracold fermionic potassium. Atoms are pinned in a network of single-particle modes, whose spatial extent emulates the long-range interactions of traditional quantum magnets. We find that below a critical interaction strength, magnetization of an initially polarized fermionic gas decays quickly, while above the transition point, the magnetization becomes long-lived, due to an energy gap that protects against dephasing by the inhomogeneous axial field. Our quantum simulation reveals a non-equilibrium transition predicted to exist but not yet directly observed in quenched s-wave superconductors. Comment: 10+18 pages, 4+9 figures |
| Databáze: | arXiv |
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