Observation of a transition between dynamical phases in a quantum degenerate Fermi gas

Smale, S.; He, Peiru; Olsen, Ben A.; Jackson, Kenneth G.; Sharum, Haille; Trotzky, Stefan; Marino, Jamir; Rey, Ana María; Thywissen, Joseph H.

doi:10.1126/sciadv.aax1568

Cited by 113 publications

(109 citation statements)

References 74 publications

(122 reference statements)

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“…We consider the effect of spin-orbit coupling (SOC) induced by control fields in Section IV, finding in particular that the weak-SOC limit generally gives rise to a (synthetic) inhomogeneous magnetic field, extending previously known results to n > 2 [38,[40][41][42][43][44]. Finally, we combine these ingredients to examine mean-field dynamical behaviors of the SU(n) spin model in Section V, finding that: (i) long-time-av-eraged observables obey simple scaling relations with the spin dimension n, exhibiting (for spin-polarized initial states) dynamical ferromagnetic and dynamical paramagnetic phases, as previously seen for the case of n = 2 [45,46], and (ii) for n > 2 the long-time dynamics can be highly sensitive to the intra-spin coherences of the initial state. We conclude and discuss future directions in Section VI.…”

Section: Su(n) Symmetries Play An Important Role In Physicssupporting

confidence: 73%

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Engineering infinite-range SU($n$) interactions with spin-orbit-coupled fermions in an optical lattice

Perlin,

Barberena,

Mamaev

et al. 2021

Preprint

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We study multilevel fermions in an optical lattice described by the Hubbard model with on site SU(n)-symmetric interactions. We show that in an appropriate parameter regime this system can be mapped onto a spin model with all-to-all SU(n)-symmetric couplings. Raman pulses that address internal spin states modify the atomic dispersion relation and induce spin-orbit coupling, which can act as a synthetic inhomogeneous magnetic field that competes with the SU(n) exchange interactions. We investigate the mean-field dynamical phase diagram of the resulting model as a function of n and different initial configurations that are accessible with Raman pulses. Consistent with previous studies for n = 2, we find that for some initial states the spin model exhibits two distinct dynamical phases that obey simple scaling relations with n. Moreover, for n > 2 we find that dynamical behavior can be highly sensitive to initial intra-spin coherences. Our predictions are readily testable in current experiments with ultracold alkaline-earth(-like) atoms.

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Section: Su(n) Symmetries Play An Important Role In Physicssupporting

confidence: 73%

“…( 1)-( 2) by the spin model in Eqs. ( 5)-( 6) has been previously benchmarked for SU(2)-symmetric interactions [38,45], and we provide additional benchmarking for SU(4) and SU (6) in Appendix A.…”

mentioning

confidence: 99%

Engineering infinite-range SU($n$) interactions with spin-orbit-coupled fermions in an optical lattice

Perlin,

Barberena,

Mamaev

et al. 2021

Preprint

Self Cite

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“…Recent developments in experiments with quantum many-body systems call for a further extension of the program to universal phenomena in quantum dynamics. For example, systems of ultracold atoms and ions exhibit new dynamical transitions 122,234,276 , as well as new forms of dynamical scaling 183,202,83,76 . Other classes of universal phenomena are seen in driven open quantum systems.…”

Section: Introductionmentioning

confidence: 99%

Strong-disorder renormalization group for periodically driven systems

et al. 2018

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Quenched randomness can lead to robust non-equilibrium phases of matter in periodically driven (Floquet) systems. Analyzing transitions between such dynamical phases requires a method capable of treating the twin complexities of disorder and discrete time-translation symmetry. We introduce a real-space renormalization group approach, asymptotically exact in the strong-disorder limit, and exemplify its use on the periodically driven interacting quantum Ising model. We analyze the universal physics near the critical lines and multicritical point of this model, and demonstrate the robustness of our results to the inclusion of weak interactions. arXiv:1807.09767v2 [cond-mat.dis-nn] 9 Nov 2018 with the following decimation rules:1234 tan Ω 45 , J 13 = J 13 − c J 24 U 1234 tan Ω 45 ,J 23 = cU 2345 , J 26 = J 24 J 56 tan Ω 45 + cU 2456 ,J 27 = J 24 J 57 tan Ω 45 + cU 2457 , J 36 = J 34 J 56 tan Ω 45 + cU 3456 ,J 37 = J 34 J 57 tan Ω 45 + cU 3457 , J 67 = −cU 6789 ,J 68 = J 68 − c J 57 U 5678 tan Ω 45 , J 78 = J 78 + c J 56 U 5678 tan Ω 45 ,J 89 = J 89 , J 9,10 = J 9,10 , U 0123 = U 0123 ,Ũ 1236 = J 56 U 1234 tan Ω 45 , U 1237 = J 57 U 1234 tan Ω 45 ,Ũ 2678 = J 24 U 5678 tan Ω 45 , U 3678 = J 34 U 5678 tan Ω 45 ,Ũ 689,10 = U 689,10 , U 789,10 = U 789,10 ,W 123678 = U 1234 U 5678 tan Ω 45 . * wberdanier@berkeley.edu 1 A. Eckardt, Rev. Mod. Phys. 89, 011004 (2017).

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“…In analogy to ground-state quantum phase transitions [18,19], dynamical and excited-state quantum phase transitions involve the existence of singularities, respectively, in the time evolution and in the energy (or an order parameter) of an excited energy level, and can extend across the excitation spectra. Dynamical phase transitions have been demonstrated in quench experiments with cold atoms in optical lattices [20][21][22] and cavities [23], trapped ions [24,25], and with superconducting qubits [26]. At the same time, excited-state quantum phase (ESQP) transitions have been shown to occur in a variety of models [27][28][29][30][31][32][33], and have been observed in superconducting microwave Dirac billiards [34].…”

Section: Introductionmentioning

confidence: 99%

Excited-state quantum phase transitions in spin-orbit coupled Bose gases

Cabedo,

Celi

2021

Preprint

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Excited-state quantum phase transitions depend on and reveal the structure of the whole spectrum of many-body systems. While they are theoretically well understood, finding suitable signatures and detect them in actual experiments remains challenging. For instance, in spinor gases, excitedstate phases have been identified and characterized through a topological order parameter that is challenging to measure in experiments. Here, we propose the Raman-dressed spin-orbit coupled gas as a novel platform to explore excited-state quantum phase transitions. In a weakly-coupled regime, the dressed system is equivalent to a spinor gas with tunable spin-spin interactions. Through this equivalence we are able to define a new excited-state phase of the dressed gas. The phase is characterize by the the behavior of the spatial density modulations, or stripes, induced by spin-orbit coupling, and can in principle be measured in current state-of-the-art experiments with ultracold atoms. Conversely, we show that the properties of the excited phase can be exploited to prepare stripe states with large and stable density modulations.

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Observation of a transition between dynamical phases in a quantum degenerate Fermi gas

Abstract: Ultracold fermions provide a new testbed for dynamical phases of quantum matter forbidden by equilibrium thermodynamics.

Cited by 113 publications

References 74 publications

Engineering infinite-range SU($n$) interactions with spin-orbit-coupled fermions in an optical lattice

Engineering infinite-range SU($n$) interactions with spin-orbit-coupled fermions in an optical lattice

Strong-disorder renormalization group for periodically driven systems

Excited-state quantum phase transitions in spin-orbit coupled Bose gases

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