2024/07/09 by Lorenzo Pizzino, Pizzino, Lorenzo, Hepeng Yao +3
Physics and Astronomy · #Atomic and Subatomic Physics Research #FOS: Physical sciences #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Quantum Gases (cond-mat.quant-gas) #Quantum Physics (quant-ph) #Strongly Correlated Electrons (cond-mat.str-el)
paper · pdf · doi:10.48550/arxiv.2407.06634
openalex publication_date 2024/07/09 · openalex created_date 2024/07/11 · openalex updated_date 2026/08/01
In this work, we extend the analysis of interacting bosons at 2D-1D dimensional crossover for finite size and temperature by using field-theory approach (bosonization) and quantum Monte Carlo simulations. Stemming from the fact that finite size low-dimensional systems are allowed only to have quasi-ordered phase, we consider the self-consistent harmonic approximation to compute the fraction of quasi-condensate and its scaling with the system size. It allows us to understand the important role played by finite size and temperature across the dimensional crossover for deciding the condensate nature. Furthermore, we consider a mean-field approximation to compute the finite size effect on the crossover temperature for both weak and strong interaction. All the physical quantities we discuss here provide essential information for quantum gas at dimensional crossover and are directly detectable in cold atom experiments