Quantized Superfluid Vortex Rings in the Unitary Fermi Gas

Bulgac, Aurel; Forbes, Michael McNeil; Kelley, Michelle M.; Roche, Kenneth J.; Wlazłowski, Gabriel

doi:10.1103/physrevlett.112.025301

Cited by 93 publications

(111 citation statements)

References 77 publications

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“…Indeed, there has been significant controversy and debate over the characterization and decay processes of various defects, notably those associated with a phase imprint in which ∆Φ ∼ π. There the original defect was thought to be a heavy soliton [5], later a vortex ring [7], and still later, as was consistent with predictions from some of our co-authors [8], established to be a solitonic vortex [6]. Similarly, defects formed via the Kibble-Zurek mechanism, using a temperature quench across the BoseEinstein condensation (BEC) transition, were originally mis-identified as solitons [9] and later determined to be solitonic vortices [10].…”

Section: Introductionsupporting

confidence: 51%

“…Similar experiments have led to the observation of a variety of defects [1,[16][17][18], while other studies engineered localized excitations through phase imprinting [4][5][6][19][20][21]. The theory associated with these experiments has suggested that solitons, or vortices or vortex rings (in some combination or sequentially) are created in the process [4,[6][7][8][22][23][24][25].…”

Section: Introductionmentioning

confidence: 96%

“…We stress that the inclusion of noise in our numerical approach is a significant addition [8]. This avoids unphysical effects due to spatial symmetries present in many other simulations [3,7,24]. We note that some studies, even while breaking certain spatial symmetries, nevertheless maintain an unphysical reflection symmetry [24,25].…”

Section: Our Approachmentioning

confidence: 99%

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Generic equilibration dynamics of planar defects in trapped atomic superfluids

et al. 2015

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We investigate equilibration processes shortly after sudden perturbations are applied to ultracold trapped superfluids. We show the similarity of phase imprinting and localized density depletion perturbations, both of which initially are found to produce "phase walls". These planar defects are associated with a sharp gradient in the phase. Importantly they relax following a quite general sequence. Our studies, based on simulations of the complex time-dependent Ginzburg-Landau equation, address the challenge posed by these experiments: how a superfluid eventually eliminates a spatially extended planar defect. The processes involved are necessarily more complex than equilibration involving simpler line vortices. An essential mechanism for relaxation involves repeated formation and loss of vortex rings near the trap edge.

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Section: Introductionsupporting

confidence: 51%

Section: Introductionmentioning

confidence: 96%

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Generic equilibration dynamics of planar defects in trapped atomic superfluids

et al. 2015

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“…The family of BEC solitons consists of many interesting members, from bright solitons in attractive BECs [6] and gap solitons in optical lattices [7], to dark solitons in repulsively interacting BECs [3][4][5], which are created experimentally by imprinting a sharp and characteristic phase jump into the BEC. Remarkably, dark solitons may also be created in strongly interacting Fermi gases [8][9][10][11][12][13][14][15][16] at the crossover from BECs to Bardeen-Cooper-Schrieffer (BCS) superfluids [17], where phase kinks are encoded in the pairing order parameter. Their recent experimental observation may offer valuable insights into the nature of fermionic superfluidity in the strongly correlated regime [13,18].…”

mentioning

confidence: 99%

Traveling Majorana Solitons in a Low-Dimensional Spin-Orbit-Coupled Fermi Superfluid

et al. 2016

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We investigate traveling solitons of a one-dimensional spin-orbit coupled Fermi superfluid in both topologically trivial and non-trivial regimes by solving the static and time-dependent Bogoliubovde Gennes equations. We find a critical velocity v h for traveling solitons that is much smaller than the value predicted using the Landau criterion due to the presence of spin-orbit coupling, which strongly upshifts the energy level of the soliton-induced Andreev bound states towards the quasi-particle scattering continuum. Above v h , our time-dependent simulations in harmonic traps indicate that traveling solitons decay by radiating sound waves. In the topological phase, we predict the existence of peculiar Majorana solitons, which host two Majorana fermions and feature a phase jump of π across the soliton, irrespective of the velocity of travel. These unusual properties of Majorana solitons may open an alternative way to manipulate Majorana fermions for fault-tolerant topological quantum computations.

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“…Both of these concepts became cornerstone tools to study atomic physics phenomena and in particular were well suited for the physics studied with ion and atom traps [81]. ERE is now a standard tool used to understand many features in optical lattices [82], Bose-Einstein condensates [83,84], or the unitary Fermi gases [85][86][87][88].…”

Section: B Gluons Quarks and Nucleonsmentioning

confidence: 99%

Current Status of Nuclear Physics Research

Bertulani

Hussein

2015

Braz J Phys

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In this review we discuss the current status of research in nuclear physics which is being carried out in different centers in the World. For this purpose we supply a short account of the development in the area which evolved over the last 9 decades, since the discovery of the neutron. The evolution of the physics of the atomic nucleus went through many stages as more data become available. We briefly discuss models introduced to discern the physics behind the experimental discoveries, such as the shell model, the collective model, the statistical model, the interacting boson model, etc., some of these models may be seemingly in conflict with each other, but this was shown to be only apparent.The richness of the ideas and abundance of theoretical models attests to the important fact that the nucleus is a really singular system in the sense that it evolves from two-body bound states such as the deuteron, to few-body bound states, such as 4 He, 7 Li, 9 Be etc. and up the ladder to heavier bound nuclei containing up to more than 200 nucleons. Clearly statistical mechanics, usually employed in systems with very large number of particles, would seemingly not work for such finite systems as the nuclei, neither do other theories which are applicable to condensed matter. The richness of nuclear physics stems from these restrictions. New theories and models are presently being developed. Theories of the structure and reactions of neutron-rich and proton-rich nuclei, called exotic nuclei, halo nuclei, or Borromean nuclei, deal with the wealth of experimental data that became available in the last 35 years. Further, nuclear astrophysics and stellar and Big Bang nucleosynthesis have become a more mature subject. Due to limited space, this review only covers a few selected topics, mainly those with which the authors have worked on. Our aimed potential readers of this review are nuclear physicists and physicists in other areas, as well as graduate students interested in pursuing a career in nuclear physics.

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Quantized Superfluid Vortex Rings in the Unitary Fermi Gas

Cited by 93 publications

References 77 publications

Generic equilibration dynamics of planar defects in trapped atomic superfluids

Generic equilibration dynamics of planar defects in trapped atomic superfluids

Traveling Majorana Solitons in a Low-Dimensional Spin-Orbit-Coupled Fermi Superfluid

Current Status of Nuclear Physics Research

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