Experiments on spontaneous vortex formation in Josephson tunnel junctions

Monaco, R.; Aarøe, Morten; Mygind, J.; Rivers, R. J.; Koshelets, V. P.

doi:10.1103/physrevb.74.144513

Cited by 59 publications

(95 citation statements)

References 48 publications

(101 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Naively, we could not easily distinguish between the two possibilities since, for idealised symmetric junctions this again gives the same scaling behaviour σ > = 1/4 [22] after the transition, albeit with a different prefactor. However, for realistic junctions proximity effects and only partial critical slowing-down σ < = 1/4 enforce σ > = 1/2 [16]. Empirically, the data is described well by the latter [16], and is not compatible with σ < = 1/4.…”

Section: Discussionmentioning

confidence: 80%

Is domain formation decided before or after the transition?

2006

View full text Add to dashboard Cite

There is increasing evidence that causality provides useful bounds in determining the domain structure after a continuous transition. In devising their scaling laws for domain size after such a transition, Zurek and Kibble presented arguments in which causality is important both before and after the time at which the transition begins to be implemented. Using numerical simulations of kinks in 1+1 dimensions, we explain how the domain structure is determined exclusively by what happens after the transition, even though the correlation length freezes in before the transition.

show abstract

Section: Discussionmentioning

confidence: 80%

Is domain formation decided before or after the transition?

2006

View full text Add to dashboard Cite

show abstract

“…The KZM has been experimentally observed and tested in a large variety of systems, such as liquid crystals [6], * giacomo.lamporesi@ino.it superfluid He-3 [7,8], thin film superconductors [9,10], annular Josephson junctions [11,12], multiferroic crystals [13,14] and ion chains [15,16]. Ultracold atomic gases represent an ideal testbed to explore different aspects of quench mechanisms, since many of their parameters can be finely controlled and tuned.…”

Section: Introductionmentioning

confidence: 99%

Creation and counting of defects in a temperature-quenched Bose-Einstein condensate

et al. 2016

View full text Add to dashboard Cite

We study the spontaneous formation of defects in the order parameter of a trapped ultracold bosonic gas while crossing the critical temperature for Bose-Einstein Condensation (BEC) at different rates. The system has the shape of an elongated ellipsoid, whose transverse width can be varied to explore dimensionality effects. For slow enough temperature quenches we find a power-law scaling of the average defect number with the quench rate, as predicted by the Kibble-Zurek mechanism. A breakdown of such a scaling is found for fast quenches, leading to a saturation of the average defect number. We suggest an explanation for this saturation in terms of the mutual interactions among defects.

show abstract

“…the distance or relative velocity between the two branes and deformations of the branes into the extra-dimensions. Although the Kibble-Zurek mechanism has been tested thoroughly in condensed matter laboratory experiments 13,14,15,16,17,18,19,20,21 , brane annihilations as subspatial SSB phenomena are quite a novel concept in condensed matter systems.…”

Section: Introductionmentioning

confidence: 99%

Tachyon Condensation and Brane Annihilation in Bose-Einstein Condensates: Spontaneous Symmetry Breaking in Restricted Lower-Dimensional Subspace

et al. 2012

View full text Add to dashboard Cite

In brane cosmology, the Big Bang is hypothesized to occur by the annihilation of the brane-anti-brane pair in a collision, where the branes are threedimensional objects in a higher-dimensional Universe. Spontaneous symmetry breaking accompanied by the formation of lower-dimensional topological defects, e.g. cosmic strings, is triggered by the so-called 'tachyon condensation', where the existence of tachyons is attributable to the instability of the brane-anti-brane system. Here, we discuss the closest analogue of the tachyon condensation in atomic Bose-Einstein condensates. We consider annihilation of domain walls, namely branes, in strongly segregated two-component condensates, where one component is sandwiched by two domains of the other component. In this system, the process of the brane annihilation can be projected effectively as ferromagnetic ordering dynamics onto a two-dimensional space. Based on this correspondence, three-dimensional formation of vortices from a domain-wall annihilation is considered to be a kink formation due to spontaneous symmetry breaking in the two-dimensional space. We also discuss a mechanism to create a 'vorton' when the sandwiched component has a vortex string bridged between the branes. We hope that this study motivates experimental researches to realize this exotic phenomenon of spontaneous symmetry breaking in superfluid systems.

show abstract

Experiments on spontaneous vortex formation in Josephson tunnel junctions

Cited by 59 publications

References 48 publications

Is domain formation decided before or after the transition?

Is domain formation decided before or after the transition?

Creation and counting of defects in a temperature-quenched Bose-Einstein condensate

Tachyon Condensation and Brane Annihilation in Bose-Einstein Condensates: Spontaneous Symmetry Breaking in Restricted Lower-Dimensional Subspace

Contact Info

Product

Resources

About