Mostra el registre d'ítem simple
Composite boson description of a low-density gas of excitons
dc.contributor.author | Golomedov, A. E. |
dc.contributor.author | Lozovik, Yu. E. |
dc.contributor.author | Astrakharchik, Grigori |
dc.contributor.author | Boronat Medico, Jordi |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament de Física |
dc.date.accessioned | 2017-11-06T19:27:49Z |
dc.date.available | 2018-10-16T00:30:33Z |
dc.date.issued | 2017-10-13 |
dc.identifier.citation | Golomedov, A., Lozovik, Y., Astrakharchik, G., Boronat, J. Composite boson description of a low-density gas of excitons. "Journal of low temperature physics", 13 Octubre 2017, vol. 189, núm. 5-6, p. 300-311. |
dc.identifier.issn | 0022-2291 |
dc.identifier.uri | http://hdl.handle.net/2117/110068 |
dc.description.abstract | Ground-state properties of a fermionic Coulomb gas are calculated using the fixed-node diffusion Monte Carlo method. The validity of the composite boson description is tested for different densities. We extract the exciton–exciton s-wave scattering length by solving the four-body problem in a harmonic trap and mapping the energy to that of two trapped bosons. The equation of state is consistent with the Bogoliubov theory for composite bosons interacting with the obtained s-wave scattering length. The perturbative expansion at low density has contributions physically coming from (a) exciton binding energy, (b) mean-field Gross–Pitaevskii interaction between excitons, and (c) quantum depletion of the excitonic condensate (Lee–Huang–Yang terms for composite bosons). In addition, for low densities we find a good agreement with the Bogoliubov bosonic theory for the condensate fraction of excitons. The equation of state in the opposite limit of large density is found to be well described by the perturbative theory including (a) mixture of two ideal Fermi gases and (b) exchange energy. We find that for low densities both energetic and coherent properties are correctly described by the picture of composite bosons (excitons). |
dc.format.extent | 12 p. |
dc.language.iso | eng |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Spain |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
dc.subject | Àrees temàtiques de la UPC::Física |
dc.subject.lcsh | Exciton theory |
dc.subject.lcsh | Bose-Einstein condensation |
dc.subject.lcsh | Bosons |
dc.subject.lcsh | Monte Carlo method |
dc.subject.other | Bose–Einstein condensation |
dc.subject.other | Composite bosons |
dc.subject.other | Excitons |
dc.subject.other | Quantum Monte Carlo |
dc.title | Composite boson description of a low-density gas of excitons |
dc.type | Article |
dc.subject.lemac | Excitons |
dc.subject.lemac | Condensació de Bose-Einstein |
dc.subject.lemac | Bosons |
dc.subject.lemac | Montecarlo, Mètode de |
dc.contributor.group | Universitat Politècnica de Catalunya. SIMCON - First-principles approaches to condensed matter physics: quantum effects and complexity |
dc.identifier.doi | 10.1007/s10909-017-1814-y |
dc.relation.publisherversion | https://link.springer.com/article/10.1007%2Fs10909-017-1814-y |
dc.rights.access | Open Access |
local.identifier.drac | 21591887 |
dc.description.version | Postprint (author's final draft) |
local.citation.author | Golomedov, A.; Lozovik, Y.; Astrakharchik, G.; Boronat, J. |
local.citation.publicationName | Journal of low temperature physics |
local.citation.volume | 189 |
local.citation.number | 5-6 |
local.citation.startingPage | 300 |
local.citation.endingPage | 311 |
Fitxers d'aquest items
Aquest ítem apareix a les col·leccions següents
-
Articles de revista [2.209]
-
Articles de revista [383]