Condensation and superfluidity of dilute Bose gases with finite-range interaction

Abstract

We investigate an ultracold and dilute Bose gas by taking into account a finite-range two-body interaction. The coupling constants of the resulting Lagrangian density are related to measurable scattering parameters by following the effective-field-theory approach. A perturbative scheme is then developed up to the Gaussian level, where both quantum and thermal fluctuations are crucially affected by finite-range corrections. In particular, the relation between spontaneous symmetry breaking and the onset of superfluidity is emphasized by recovering the renowned Landau's equation for the superfluid density in terms of the condensate one.

18 pages, 4 figures, invited contribution to New Journal of Physics Focus Issue on Quantum Transport in Ultracold Atoms

References in corpus (5)

• Pairing fluctuations and the superfluid density through the BCS-BEC crossover
• Ground state energy of the two-dimensional weakly interacting Bose gas: First correction beyond Bogoliubov theory
• Non-Universal Equation of State of the Two-Dimensional Bose Gas
• Finite-Range Corrections to the Thermodynamics of the One-Dimensional Bose Gas
• Collective excitations of a dilute Bose gas at finite temperature: TDHFB Theory

Cited by in corpus (4)

• Superfluids, Fluctuations and Disorder
• Zero-temperature equation of state of a two-dimensional bosonic quantum fluid with finite-range interaction
• Proposal of a computational approach for simulating thermal bosonic fields in phase space
• Effective field theory of bosons with finite-range interaction in a disordered environment