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Quantum versus mean-field collapse in a many-body system
dc.contributor.author | Astrakharchik, Grigori |
dc.contributor.author | Malomed, Boris A. |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament de Física |
dc.date.accessioned | 2016-02-17T15:33:53Z |
dc.date.available | 2016-02-17T15:33:53Z |
dc.date.issued | 2015-10-29 |
dc.identifier.citation | Astrakharchik, G., Malomed, B. Quantum versus mean-field collapse in a many-body system. "Physical Review A - Atomic, Molecular, and Optical Physics", 29 Octubre 2015, vol. 92, p. 043632-1-043632-7. |
dc.identifier.issn | 1094-1622 |
dc.identifier.uri | http://hdl.handle.net/2117/83079 |
dc.description.abstract | The recent analysis, based on the mean-field approximation (MFA), has predicted that the critical quantum collapse of the bosonic wave function, pulled to the center by the inverse-square potential in the three-dimensional space, is suppressed by the repulsive cubic nonlinearity in the bosonic gas, the collapsing ground state being replaced by a regular one. We demonstrate that a similar stabilization acts in a quantum many-body system, beyond the MFA. While the collapse remains possible, repulsive two-particle interactions give rise to a metastable gaseous state, which is separated by a potential barrier from the collapsing regime. The stability of this state improves with the increase of the number of particles. The results are produced by calculations of the variational energy, with the help of the Monte Carlo method. |
dc.language.iso | eng |
dc.subject | Àrees temàtiques de la UPC::Física |
dc.subject.lcsh | Quantum theory |
dc.subject.lcsh | Wave functions |
dc.title | Quantum versus mean-field collapse in a many-body system |
dc.type | Article |
dc.subject.lemac | Quàntums, Teoria dels |
dc.subject.lemac | Funcions d'ona |
dc.contributor.group | Universitat Politècnica de Catalunya. SIMCON - First-principles approaches to condensed matter physics: quantum effects and complexity |
dc.identifier.doi | 10.1103/PhysRevA.92.043632 |
dc.description.peerreviewed | Peer Reviewed |
dc.relation.publisherversion | http://journals.aps.org/pra/abstract/10.1103/PhysRevA.92.043632 |
dc.rights.access | Open Access |
local.identifier.drac | 17429725 |
dc.description.version | Postprint (author's final draft) |
local.citation.author | Astrakharchik, G.; Malomed, B. |
local.citation.publicationName | Physical Review A - Atomic, Molecular, and Optical Physics |
local.citation.volume | 92 |
local.citation.startingPage | 043632-1 |
local.citation.endingPage | 043632-7 |
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