Acoustic superradiance from an optical-superradiance-induced vortex in a Bose-Einstein condensate

Ghazanfari, Nader; Müstecaplıoğlu, Özgür E.

doi:10.1103/physreva.89.043619

Cited by 13 publications

(11 citation statements)

References 31 publications

(90 reference statements)

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“…Our results can be significant to probe vortex nucleation and rotational symmetry breaking dynamics using the scattered radiation, and as an alternative single optical pumping scheme for rapid and large OAM transfer to BEC. We hope our scheme can inspire further investigation directions such as cavity confinement effects [7], supersolidity and bosonic vortex molecules and crystals [44], and collective excitations [45].…”

Section: Resultsmentioning

confidence: 93%

Collectively induced many-vortices topology via rotatory Dicke quantum phase transition

2016

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We examine the superradiance of a Bose-Einstein condensate pumped with a Laguerre-Gaussian laser of high winding number, e.g., = ℓ 7. The laser beam transfers its orbital angular momentum (OAM) to the condensate at once due to the collectivity of the superradiance. An ℓ-fold rotational symmetric structure emerges with the rotatory superradiance. ℓ number of single-charge vortices appear at the arms of this structure. Even though the pump and the condensate profiles initially have cylindrical symmetry, we observe that it is broken to ℓ-fold rotational symmetry at the superradiance. Breaking of the cylindrical symmetry into the ℓ-fold symmetry and OAM transfer to the condensate become significant after the same critical pump strength. Reorganization of the condensate resembles the ordering in the experiment by Esslinger and colleagues (2010 Nature 264 1301). We numerically verify that the critical point for the onset of the reorganization, as well as the properties of the emitted pulse, conform to the characteristics of superradiant quantum phase transition.

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Section: Resultsmentioning

confidence: 93%

Collectively induced many-vortices topology via rotatory Dicke quantum phase transition

2016

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“…Thus, acoustically driven phase slips can be treated as quantum analogue of rotational superradiance. Acoustic wave dynamics and interaction with a vortex are quite similar in the classic [17,18] and quantum [19][20][21][22] systems. However, it is worth to mention that for the strong perturbations shock waves appear instead of acoustic waves [23].…”

Section: Introductionmentioning

confidence: 97%

Phase slips driven by acoustic waves in Bose-Einstein condensates with ring topology

Kuriatnikov,

Olashyn,

Yakimenko

2020

Preprint

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Rotational superradiance is one of the most fascinating phenomena in black-hole physics. Here, with the aim of probing quantum properties of superradiance in the lab, we investigate the interaction of the acoustic waves with quantum vortices in Bose-Einstein condensates (BEC) in the framework of dissipative mean-field model. We find the conditions of the acoustic-induced quantum phase slips in condensates with ring topology and discuss the possibility of observing an acoustic analogue of quantum superradiance in ultracold atomic gases.

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“…The experimental realization of vortex states in rotating trapped atomic BECs [6,7], brought the acoustic black-hole analogy into the BEC superfluid [8,2]. The acoustic superradiance and even the Penrose process in both BEC superfluids and classical fluids have been suggested in the literature [9,10,11], and quickly gained momentum as an active research subject. Eventually, an acoustic black hole in a needle-shaped BEC of 87Rb is experimentally demonstrated and recently spontaneous Hawking radiation, stimulated by quantum vacuum fluctuations, emanating from an analogue black hole in an atomic BEC is reported [12,13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Theoretical/numerical studies concerning acoustic superradiance mostly investigated linear acoustic perturbations superimposed on a constant background density of the superfluid [9,11,15,16,17]. On one hand, the constant background density approximation (const-bg-dens) combined with the draining bathtub model (DBT) [18], elegantly demonstrates the acoustic superradiance.…”

Section: Introductionmentioning

confidence: 99%

Echoes from the event horizon of a superfluid vortex

Güven

Demirkaya

2022

J. Phys.: Conf. Ser.

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A vortex formed in the superfluid state of a Bose-Einstein condensate may exhibit superradiance a la blackhole for radially propagating acoustic fluctuations. The analogy is usually based on the so-called draining bathtub model of the vortex, in which an event horizon and ergosphere emerges when the radial velocity of the superfluid exceeds the propagation speed of sound in the condensate. The acoustic fluctuations mimic a massless scalar field in the curved Lorentzian space-time of the vortex and are governed by the Klein-Gordon wave equation. One common main approximation is the constant background density of the superfluid even in the presence of the vortex. This sets a constant relativistic sound speed. However, the vortex state solution of the Gross-Pitaevskii equation clearly shows that both the density and the speed of sound vary radially near the vortex core, where the event horizon and thus the superradiance will take place. What changes would this complex interdependence bring to the formulation and to the outcomes of the superradiance based on constant density approximation? Here, we recount this question posed under the guidance of Prof. Tekin Dereli and present recent results. We show that the self-consistent density modifies the amplification dynamics near the event horizon significantly, thereby altering the temporal and spectral fingerprint of the superradiance of the vortex.

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Acoustic superradiance from an optical-superradiance-induced vortex in a Bose-Einstein condensate

Cited by 13 publications

References 31 publications

Collectively induced many-vortices topology via rotatory Dicke quantum phase transition

Collectively induced many-vortices topology via rotatory Dicke quantum phase transition

Phase slips driven by acoustic waves in Bose-Einstein condensates with ring topology

Echoes from the event horizon of a superfluid vortex

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