Mapping out the quasi-condensate transition through the 1D-3D dimensional crossover

• DOI: 10.48550/arxiv.1011.3631
• Publication Date: 2010-01-01
• Authors: Julien Armijo; T. Jacqmin; K. V. Kheruntsyan; Isabelle Bouchoule
• Keywords: Degeneracy (biology); Ideal gas

By measuring the density fluctuations in a highly elongated weakly interacting Bose gas, we observe and quantify transition from ideal gas to quasi-condensate regime throughout dimensional crossover purely 1D an almost 3D gas. We show that entire region are described surprisingly well by modified Yang-Yang model. Furthermore, find at low temperatures linear scales according interaction-driven scenario of longitudinally uniform whereas high it degeneracy-driven critical transverse condensation