DSpace DSpace UPC
 Català   Castellano   English  

E-prints UPC >
Altres >
Enviament des de DRAC >

Empreu aquest identificador per citar o enllaçar aquest ítem: http://hdl.handle.net/2117/16407

Arxiu Descripció MidaFormat
astrakharchik_physical_12.pdf317,18 kBAdobe PDFThumbnail

Citació: Osychenko, O. [et al.]. Zero-temperature phase diagram of Yukawa bosons. "Physical review A", 2012, vol. 85, núm. 6, p. 1-6.
Títol: Zero-temperature phase diagram of Yukawa bosons
Autor: Osychenko, O.N.; Astrakharchik, Grigori Veure Producció científica UPC; Mazzanti Castrillejo, Fernando Pablo Veure Producció científica UPC; Boronat Medico, Jordi Veure Producció científica UPC
Data: 2012
Tipus de document: Article
Resum: We study the zero-temperature phase diagram of bosons interacting via screened Coulomb (Yukawa) potential by means of the diffusion Monte Carlo method. The Yukawa potential is used as a model interaction in the neutron matter, dusty plasmas, and charged colloids. As shown by Petrov et al. [Phys. Rev. Lett. 99, 130407 (2007)], interactions between weakly bound molecules of heavy and light fermionic atoms are described by an effective Yukawa potential with a strength related to the heavy-light mass ratio M/m, which might lead to crystallization in a two-dimensional geometry if the mass ratio of heavy-light fermions exceeds a certain critical value. In the present work we do a thorough study of the quantum three-dimensional Yukawa system. For strong interactions (equivalently, large mass ratios) the system experiences several phase transitions as the density is increased, passing from gas to solid and to gas phase again.Weakly interacting Yukawa particles do not crystallize at any density. We find the minimal interaction strength at which the crystallization happens. In terms of the two-component fermionic system, this strength corresponds to a heavy-light mass ratio of M/m ∼ 180, so that it is impossible to realize the gas-crystal transition in a conventional bulk system. For the Yukawa model of fermionic mixtures we also analyze the possibility of building molecular systems with very large effective mass ratios by confining the heavy component to a sufficiently deep optical lattice. We show how the effective mass of the heavy component can be made arbitrarily large by increasing the lattice depth, thus leading to a tunable effective mass ratio that can be used to realize a molecular superlattice.
ISSN: 1050-2947
URI: http://hdl.handle.net/2117/16407
DOI: 10.1103/PhysRevA.85.063604
Versió de l'editor: http://pra.aps.org/abstract/PRA/v85/i6/e063604
Apareix a les col·leccions:Altres. Enviament des de DRAC
SIMCON - Grup de Recerca de Simulació per Ordinador en Matèria Condensada. Articles de revista
Departament de Física i Enginyeria Nuclear. Articles de revista

Stats Mostra les estadístiques d'aquest ítem

SFX Query

Aquest ítem (excepte textos i imatges no creats per l'autor) està subjecte a una llicència de Creative Commons Llicència Creative Commons
Creative Commons


Valid XHTML 1.0! Programari DSpace Copyright © 2002-2004 MIT and Hewlett-Packard Comentaris
Universitat Politècnica de Catalunya. Servei de Biblioteques, Publicacions i Arxius