This paper reviews recent experimental and theoretical progress concerning many-body
phenomena in dilute, ultracold gases. It focuses on effects beyond standard weak-coupling …

This article reviews, from a very personal point of view, the origins and the early work on
transitions driven by topological defects such as vortices in the two dimensional planar rotor …

Any state of matter is classified according to its order, and the type of order that a physical
system can possess is profoundly affected by its dimensionality. Conventional long-range …

This colloquium surveys a number of theoretical problems and open questions in the field of
two-dimensional dilute Bose gases with weak repulsive interactions. In contrast to three …

Inspired by investigations of Bose-Einstein condensates (BECs) produced in the Cold Atom
Laboratory (CAL) aboard the International Space Station, we present a study of …

Here we show, by performing ab initio classical field simulations that two distinct superfluid
phases, separated by thermal vortex-antivortex pair creation, exist in experimentally …

We simulate a trapped quasi-two-dimensional Bose gas using a classical field method. To
interpret our results we identify the uniform Berezinskii-Kosterlitz-Thouless (BKT) …

We measure the in-plane distribution of thermally activated vortices in a trapped quasi-2D
Bose gas, where we enhance the visibility of density-depleted vortex cores by radially …

Current experiments on atomic gases in highly anisotropic traps present the opportunity to
study in detail the low temperature phases of two-dimensional inhomogeneous systems …

We investigate the harmonically trapped interacting Bose gas in a quasi-two-dimensional
geometry using the classical field method. The system exhibits quasi-long-range order and …