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dc.contributor.authorTylutki, Marek
dc.contributor.authorAstrakharchik, Grigori
dc.contributor.authorMalomed, Boris A.
dc.contributor.authorPetrov, D. S.
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.date.accessioned2020-07-30T13:51:44Z
dc.date.available2020-07-30T13:51:44Z
dc.date.issued2020-05-21
dc.identifier.citationTylutki, M. [et al.]. Collective excitations of a one-dimensional quantum droplet. "Physical review A", 21 Maig 2020, vol. 101, núm. 5, p. 051601:1-051601:5.
dc.identifier.issn1050-2947
dc.identifier.urihttp://hdl.handle.net/2117/328092
dc.description.abstractWe calculate the excitation spectrum of a one-dimensional self-bound quantum droplet in a two-component bosonic mixture described by the Gross-Pitaevskii equation (GPE) with cubic and quadratic nonlinearities. The cubic term originates from the mean-field energy of the mixture proportional to the effective coupling constant dg, whereas the quadratic nonlinearity corresponds to the attractive beyond-mean-field contribution. The droplet properties are governed by a control parameter ¿¿dgN2/3, where N is the particle number. For large ¿>0, the droplet features the flat-top shape with the discrete part of its spectrum consisting of plane-wave Bogoliubov phonons propagating through the flat-density bulk and reflected by edges of the droplet. With decreasing ¿, these modes cross into the continuum, sequentially crossing the particle-emission threshold at specific critical values. A notable exception is the breathing mode, which we find to be always bound. The balance point ¿=0 provides implementation of a system governed by the GPE with an unusual quadratic nonlinearity. This case is characterized by the ratio of the breathing-mode frequency to the particle-emission threshold equal to 0.8904. As ¿ tends to -8, this ratio tends to 1 and the droplet transforms into the soliton solution of the integrable cubic GPE.
dc.language.isoeng
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Física
dc.subject.lcshSuperfluidity
dc.subject.lcshBose-Einstein condensation
dc.subject.otherBose-Einstein condensates
dc.subject.otherUltracold gases
dc.subject.otherSuperfluidity
dc.titleCollective excitations of a one-dimensional quantum droplet
dc.typeArticle
dc.subject.lemacSuperfluïdesa
dc.subject.lemacCondensació de Bose-Einstein
dc.contributor.groupUniversitat Politècnica de Catalunya. SIMCON - First-principles approaches to condensed matter physics: quantum effects and complexity
dc.identifier.doi10.1103/PhysRevA.101.051601
dc.relation.publisherversionhttps://journals.aps.org/pra/abstract/10.1103/PhysRevA.101.051601
dc.rights.accessOpen Access
local.identifier.drac28997075
dc.description.versionPostprint (author's final draft)
local.citation.authorTylutki, M.; Astrakharchik, G.; Malomed, B.; Petrov, D.
local.citation.publicationNamePhysical review A
local.citation.volume101
local.citation.number5
local.citation.startingPage051601:1
local.citation.endingPage051601:5


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