Quantum theory of the two-dimensional Bose liquid

Vladimir Gritsev, Ehud Altman, Anatoli Polkovnikov +1 more

Interference experiments with independent condensates provide a powerful tool for analyzing correlation functions. Scaling of the average fringe contrast with the system size is determined by the two‐point correlation function and can be used to study the Luttinger liquid liquid behavior in one‐dimensional systems and to observe the Kosterlitz‐Thouless transition in two‐dimensional quasicondensates. Additionally, higher moments of the fringe contrast can be used to determine the higher order correlation functions. In this article we focus on interference experiments with one‐dimensional Bose liquids and show that methods of conformal field theory can be applied to calculate the full quantum distribution function of the fringe contrast.

D J Amit, Eugene P. Gross

Boris Laikhtman, Ronen Rapaport

We study the correlations of two-dimensional dipolar bosons with excitons in semiconductor bilayers as a specific case, in the whole temperature-concentration region. We show that at low concentrations, the Bose degeneracy is accompanied by strong multi-particle correlations and the system behaves as a Bose liquid. At high concentrations the repulsion suppresses quantum coherence and the system behaves as a classical liquid down to a temperature lower than typical for a Bose gas. The interaction energy of the particles is a sensitive tool for a measurement of the correlations. This theory can apply to other systems of bosons with extended interaction.

Eugene P. Gross

Achilles D. Speliotopoulos

Красильников Владимир Владимирович, S. V. Peletminskiǐ