Quantum fluctuations beyond the Gutzwiller approximation in the Bose-Hubbard model
Fabio Caleffi, Massimo Capone, Chiara Menotti, Iacopo Carusotto, Alessio Recati
Abstract
This paper presents a method based on the Gutzwiller approximation for accessing quantum fluctuations in the Bose-Hubbard model. The scheme shows a semi-analytical expression for the superfluid stiffness and compares the density correlations with numerical results close to the Mott-superfluid criticality.
Topics & Concepts
PhysicsQuantumQuantum fluctuationQuantum mechanicsStatistical physicsSuperfluidityExpression (computer science)Scheme (mathematics)Quantum phase transitionProbability density functionQuantum electrodynamicsSpectrum (functional analysis)Work (physics)Spectral densityQuantum dynamicsQuantum entanglementCold Atom Physics and Bose-Einstein CondensatesPhysics of Superconductivity and MagnetismQuantum many-body systems