Controlling persistent currents in fermionic rings via phase imprinting

Pace, G. Del; Xhani, Klejdja; Falconi, Alessandro Muzi; Fedrizzi, M.; Grani, Nicola; Rajkov, Diego Hernandez; Scazza, Francesco; Kwon, Woo Jin; Roati, G.

doi:10.26226/m.6275705766d5dcf63a311376

Cited by 2 publications

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“…With our work, we bring conceptually relevant aspects of many-body physics to the domain of what can be operatively tested. Our analysis is timely with the current stage of cold atoms quantum technology: persistent current in toroidal cold fermionic atoms has been achieved in [28,29] and mesoscopic pairing was experimentally analyzed in [53].…”

Section: Discussionmentioning

confidence: 98%

“…While the features mentioned above do provide specific aspects for single particle and many-body quantum coherence, their interplay in interacting many-body systems remains unclear [16,27]. In this paper, we operatively track the aforementioned interplay through a single protocol (see figure 1), the expansion dynamics of an interacting Fermi gas, that is well within the current state of the art of the cold atoms research field [28,29]. To this end, we study a degenerate interacting Fermi gas confined in a ring-shaped potential and pierced by an effective magnetic flux.…”

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confidence: 98%

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Single-particle versus many-body phase coherence in an interacting Fermi gas

Pecci¹,

Naldesi²,

Minguzzi³

et al. 2022

Quantum Sci. Technol.

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In quantum mechanics, each particle is described by a complex valued wave-function characterized by amplitude and phase. When many particles interact each other, cooperative phenomena give rise to a quantum many-body state with a specific quantum coherence. What is the interplay between single-particle’s phase coherence and many-body quantum coherence? Over the years, such question has been object of profound analysis in quantum physics. Here, we demonstrate how the time-dependent interference formed by releasing an interacting degenerate Fermi gas from a specific matter-wave circuit in an effective magnetic field can tell apart the two notions. Single-particle phase coherence, indicated by the first-order correlator, and many-body quantum coherence, indicated by the density-density correlator, are displayed as distinct features of the interferogram. Single particle phase coherence produces spiral interference of the Fermi orbitals at intermediate times. Many- body quantum coherence emerges as long times interference. The interplay between single-particle coherence and many-body coherence is reflected in a stepwise dependence of the interference pattern on the effective magnetic field.

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Section: Discussionmentioning

confidence: 98%

mentioning

confidence: 98%

Single-particle versus many-body phase coherence in an interacting Fermi gas

Pecci¹,

Naldesi²,

Minguzzi³

et al. 2022

Quantum Sci. Technol.

View full text Add to dashboard Cite

show abstract

Observation of vortices and vortex stripes in a dipolar condensate

et al. 2022

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Quantized vortices are a prototypical feature of superfluidity that have been observed in multiple quantum gas experiments. But the occurrence of vortices in dipolar quantum gases—a class of ultracold gases characterized by long-range anisotropic interactions—has not been reported yet. Here we exploit the anisotropic nature of the dipole–dipole interaction of a dysprosium Bose–Einstein condensate to induce angular symmetry breaking in an otherwise cylindrically symmetric pancake-shaped trap. Tilting the magnetic field towards the radial plane deforms the cloud into an ellipsoid, which is then set into rotation. At stirring frequencies approaching the radial trap frequency, we observe the generation of dynamically unstable surface excitations, which cause angular momentum to be pumped into the system through vortices. Under continuous rotation, the vortices arrange into a stripe configuration along the field, in close agreement with numerical simulations.

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Controlling persistent currents in fermionic rings via phase imprinting

Cited by 2 publications

References 0 publications

Single-particle versus many-body phase coherence in an interacting Fermi gas

Single-particle versus many-body phase coherence in an interacting Fermi gas

Observation of vortices and vortex stripes in a dipolar condensate

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