dc.contributor |
Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear |
dc.contributor |
Universitat Politècnica de Catalunya. SIMCON - Grup de Recerca de Simulació per Ordinador en Matèria Condensada |
dc.contributor.author |
Osychenko, O.N. |
dc.contributor.author |
Astrakharchik, Grigori |
dc.contributor.author |
Mazzanti Castrillejo, Fernando Pablo |
dc.contributor.author |
Boronat Medico, Jordi |
dc.date |
2012 |
dc.identifier.citation |
Osychenko, O. [et al.]. Zero-temperature phase diagram of Yukawa bosons. "Physical review A", 2012, vol. 85, núm. 6, p. 1-6. |
dc.identifier.citation |
1050-2947 |
dc.identifier.citation |
10.1103/PhysRevA.85.063604 |
dc.identifier.uri |
http://hdl.handle.net/2117/16407 |
dc.language.iso |
eng |
dc.relation |
http://pra.aps.org/abstract/PRA/v85/i6/e063604 |
dc.rights |
Attribution-NonCommercial-NoDerivs 3.0 Spain |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.rights |
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
dc.subject |
Àrees temàtiques de la UPC::Física::Física de fluids::Física de gasos |
dc.subject |
Bosons |
dc.subject |
Coulomb potential |
dc.subject |
Bosons |
dc.subject |
Gasos |
dc.title |
Zero-temperature phase diagram of Yukawa bosons |
dc.type |
info:eu-repo/semantics/publishedVersion |
dc.type |
info:eu-repo/semantics/article |
dc.description.abstract |
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. |