Superflow in a Toroidal Bose-Einstein Condensate: An Atom Circuit with a Tunable Weak Link

Ramanathan, Anand; Wright, Kevin; Muniz, Sérgio Ricardo; Zelán, Martin; Hill, W. T.; Lobb, C. J.; Helmerson, Kristian; Phillips, William D.; Campbell, Gretchen K.

doi:10.1103/physrevlett.106.130401

Cited by 488 publications

(597 citation statements)

References 30 publications

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“…A range of applications of this technique can be envisioned: for optimized beam geometries, i.e., small w 0 , R 0 , and z R , the toroidal dark focus of the PDR generated by CR could be used to built an all-optical trap for BECs using a single beam. Under such conditions, this potential could be used as a basic element in atomic SQUID experiments [216,217], as well as to study the dynamics of matter waves with periodic boundary conditions and the generation of persistent currents [208,218]. For large R 0 , the PDR can be used as a dark 2D ring potential by using a 1D light sheet, along the axial direction, as an additional confining potential.…”

Section: Discussionmentioning

confidence: 99%

“…A one-dimensional stack of ORPs in a line has been proposed in an optical cavity [205] and demonstrated with axicon beams [206]. Experimental storage and propagation of ultra-cold atoms and BECs in bright ORPs have been reported recently [207,208]. Dark ORPs on the other hand are optical fields with an annular region of minimum intensity [170], such as closed-loop optical singularities [91,94], for which the region of minimum intensity is exactly zero.…”

Section: Blue-detuned Optical Ring Traps For Becs Based On Conical Rementioning

confidence: 99%

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Conical refraction: fundamentals and applications

Turpin

Loiko

Kalkandjiev

et al. 2016

Laser & Photonics Reviews

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A mis padres, hermanos, sobrinos y a Raquel AcknowledgmentsTot té un principi i un final i aquest serà el punt final a una etapa de la meva vida la qual estic segur que d'aquí uns anys, quan miri enrere, veuré que ha estat probablement la que ha tingut una major rellevància tant a nivell personal com científic. Quan vaig acabar la carrera no tenia gaire clar quin camí seguir però vaig tenir la sort de parlar amb qui ha estat el meu director de tesi, el Jordi, qui em va guiar i va posar tota la seva confiança en mi des del primer moment. Em va oferir un tema original i es va aventurar a dirigir una tesi amb una forta vessant experimental, tot un atreviment venint d'un teòric! Quan vaig començar el Màster, si m'haguessin dit on he arribat 5 anys després mai m'ho hauria cregut i, Jordi, tu tens gran part de culpa de tot això. Moltes gràcies per haver confiat en mi des del primer dia, per haver-te mostrat sempre tan orgullós de tot el que he fet, per haver estat sempre disponible i per ajudar-me i animar-me quan he passat moments durs durant aquest anys. M'has ensenyat a ser un bon científic, a moure'm dins aquest món, a creure em mi i a ser una millor persona. Mai t'estaré prou agraït per tot això i per haver sigut tan proper amb els teus cotilleos, converses de futbol, política, noies, etc. dinant al bar. Has estat com un pare per a mi (bueno, un germà gran, que tampoc ets tan vell per a ser Mompare :P). Si el Jordi ha estat el meu pare en la ciència, el Yury ha estat el meu gurú científic. Mai he trobat una persona tan pacient, que sàpiga tant de qualsevol tema i amb tanta dedicació com tu. M'has ensenyat a ser riguròs, a tenir un mètode, la importància de estar al dia de tot el que es fa en el cap d'estudi, a programar, i un llarg etcètera. En resum, m'has ajudat a donar-me forma a mi mateix com a científic i a tenir perseverança en el que faig. Tot això sense oblidar que per a mi ets un gran amic! Seguidament, també he donar les gràcies al Todor, una de les persones més enèrgiques que conec i amb més passió per la ciència. Tu vas iniciar tot el tema de la refracció cònica al nostre grup i has demostrat que ets realment qui més coneix de cristalls i del fenomen en si. Si no hagués estat per tu, no podríem haver començat res d'això i no podríem haver explotat el fenomen ni una quarta part del que hem fet. Ets un exemple per tenir sempre un somriure a la cara i per aquesta iii iv força que et fa tirar endavant tots els teus projectes. També vull donar les gràcies a altres companys del Grup d'Òptica, començant per la Verònica, que va passar de ser una "professora de la carrera" a ser el meu ideal de constància i l'esforç. Ets un exemple professional a més a més d'una persona molt més propera i alegra del que pot semblar a primera vista. A Ramón también le tengo que agradecer su ayuda y su disponibilidad a lo largo de estos años, su paciencia cuando ha tenido que soportar mis imitaciones y su alegría y naturalidad en todo momento. Amb el Francesc també he compartit molts bons moments, sobretot a les diverses activit...

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Section: Discussionmentioning

confidence: 99%

Section: Blue-detuned Optical Ring Traps For Becs Based On Conical Rementioning

confidence: 99%

Conical refraction: fundamentals and applications

Turpin

Loiko

Kalkandjiev

et al. 2016

Laser & Photonics Reviews

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“…Here, vortices are stable as far as the system is kept rotating and become unstable when the imposed rotation is halted [77]. However, persistent flow can be observed when a BEC is confined into a toroidal trap and the quantised rotation is initiated by a pulsed Laguerre-Gauss beam [88,89,90]. The toroidal trap is essential to allow the vortex stability, because of the energy cost of the vortex core to move through the high density region from the center of the torus where the density is zero.…”

Section: Methodsmentioning

confidence: 99%

Vortices in Polariton OPO Superfluids

Marchetti

Szymańska

2012

Exciton Polaritons in Microcavities

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This chapter reviews the occurrence of quantised vortices in polariton fluids, primarily when polaritons are driven in the optical parametric oscillator (OPO) regime. We first review the OPO physics, together with both its analytical and numerical modelling, the latter being necessary for the description of finite size systems. Pattern formation is typical in systems driven away from equilibrium. Similarly, we find that uniform OPO solutions can be unstable to the spontaneous formation of quantised vortices. However, metastable vortices can only be injected externally into an otherwise stable symmetric state, and their persistence is due to the OPO superfluid properties. We discuss how the currents charactering an OPO play a crucial role in the occurrence and dynamics of both metastable and spontaneous vortices.

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“…The power of effective field theory has also proven to be useful in treating other aspects of many-body physics in cold atoms [5]. Recently developed technologies for accurate temperature determination [6] and for creating stable, flat (bulk-like) trapping potentials [7] and ring-shape potentials [8] provide some of the necessary tools for probing thermodynamics and phase transitions of cold atoms. Phase separation, the demixing phenomenon that spontaneously breaks the global translational symmetry, was the second transition after Bose-Einstein condensation (BEC) to be observed in the cold-atom laboratory [9].…”

Section: Introductionmentioning

confidence: 99%

Large-Napproximation for one- and two-component dilute Bose gases

2012

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We discuss the mean-field theories obtained from the leading order in a large-N approximation for one-and two-component dilute Bose gases. For a one-component Bose gas this approximation has the following properties: the Bose-Einstein condensation (BEC) phase transition is second order but the critical temperature Tc is not shifted from the non-interacting gas value T0. The spectrum of excitations in the BEC phase resembles the Bogoliubov dispersion with the usual coupling constant replaced by the running coupling constant which depends on both temperature and momentum. We then study two-component Bose gases with both inter-and intra-species interactions and focus on the stability of the mixture state above Tc. Our mean-field approximation predicts an instability from the mixture state to a phase-separated state when the ratio of the inter-species interaction strength to the intra-species interaction strength (assuming equal strength for both species) exceeds a critical value. At high temperature this is a structural transition and the global translational symmetry is broken. Our work complements previous studies on the instability of the mixture phase in the presence of BEC.

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Superflow in a Toroidal Bose-Einstein Condensate: An Atom Circuit with a Tunable Weak Link

Cited by 488 publications

References 30 publications

Conical refraction: fundamentals and applications

Conical refraction: fundamentals and applications

Vortices in Polariton OPO Superfluids

Large-Napproximation for one- and two-component dilute Bose gases

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