193 citations · 477 across the 19 of their papers we have counts for
19 papers
Enhanced squeezing for quantum gravimetry in a Bose-Einstein condensate with focussing
Lewis A. Williamson, Karandeep Gill, Andrew J. Groszek +2
Free-fall atom interferometers offer a powerful platform for accurate, absolute gravitational sensing. Szigeti et al. [Phys. Rev. Lett. 125, 100402 (2020)] recently proposed a quan…
Universal coarsening of a two-dimensional Bose gas under conservative evolution
Andrew J. Groszek, Thomas P. Billam
We investigate the phase ordering dynamics of a uniform two-dimensional Bose gas quenched to a finite temperature in the superfluid phase. Starting from a defect-rich, far-from-equ…
Unblockable Communication With Gravity
Andrew J. Groszek, Charles W. Woffinden, Michael D. Harvey +2
All modern wireless communication technologies are based on electromagnetism. However, electromagnetic signals are susceptible to screening and blocking, so their availability cann…
Berezinskii-Kosterlitz-Thouless transitions in a ferromagnetic superfluid: effects of axial magnetization
Andrew P. C. Underwood, Andrew J. Groszek, Xiaoquan Yu +2
An easy-plane ferromagnetic spin-1 Bose gas undergoes two Berezinskii-Kosterlitz-Thouless (BKT) transitions, associated with mass and spin superfluidity respectively. We study the…
Fluctuation theorem anomaly in a point-vortex fluid
Rama Sharma, Tapio P. Simula, Andrew J. Groszek
The second law of thermodynamics posits that in closed macroscopic systems the rate of entropy production must be positive. However, small systems can exhibit negative entropy prod…
Viability of rotation sensing using phonon interferometry in Bose-Einstein condensates
Charles W. Woffinden, Andrew J. Groszek, Guillaume Gauthier +7
We demonstrate the use of a ring-shaped Bose-Einstein condensate as a rotation sensor by measuring the interference between two counter-propagating phonon modes imprinted azimuthal…
Berezinskii-Kosterlitz-Thouless transitions in an easy-plane ferromagnetic superfluid
Andrew P. C. Underwood, Andrew J. Groszek, Xiaoquan Yu +2
A two-dimensional (2D) spin-1 Bose gas exhibits two Berezenskii-Kosterlitz-Thouless (BKT) transitions in the easy-plane ferromagnetic phase. The higher temperature transition is as…
Critical Velocity and Arrest of a Superfluid in a Point-Like Disordered Potential
R. Doran, A. J. Groszek, T. P. Billam
Superfluid flow past a potential barrier is a well studied problem in ultracold Bose gases, however, fewer studies have considered the case of flow through a disordered potential.…
Simulating cosmological supercooling with a cold atom system II
Thomas P. Billam, Kate Brown, Andrew J. Groszek +1
We perform an analysis of the supercooled state in an analogue of an early universe phase transition based on a one dimensional, two-component Bose gas with time-dependent interact…
Geometric phases of a vortex in a superfluid
Rodney E. S. Polkinghorne, Andrew J. Groszek, Tapio P. Simula
We consider geometric phases of mobile quantum vortices in superfluid Bose-Einstein condensates. Haldane and Wu [Phys. Rev. Lett. 55, 2887 (1985)] showed that the geometric phase,…
Crossover in the dynamical critical exponent of a quenched two-dimensional Bose gas
Andrew J. Groszek, Paolo Comaron, Nikolaos P. Proukakis +1
We study the phase ordering dynamics of a uniform Bose gas in two dimensions following a quench into the ordered phase. We explore the crossover between dissipative and conservativ…
Simulating cosmological supercooling with a cold atom system
Thomas P. Billam, Kate Brown, Ian G. Moss
We perform an analysis of the supercooled state in an analogue to an early universe phase transition based on a one dimensional, two-component Bose gas. We demonstrate that the the…
Decaying quantum turbulence in a two-dimensional Bose-Einstein condensate at finite temperature
Andrew J. Groszek, Matthew J. Davis, Tapio P. Simula
We numerically model decaying quantum turbulence in two-dimensional disk-shaped Bose-Einstein condensates, and investigate the effects of finite temperature on the turbulent dynami…
Order from chaos: Observation of large-scale flow from turbulence in a two-dimensional superfluid
Shaun P. Johnstone, Andrew J. Groszek, Philip T. Starkey +3
Interacting systems driven far from equilibrium tend to evolve to steady states exhibiting large-scale structure and order. In two-dimensional turbulent flow the seemingly random s…
Motion of vortices in inhomogeneous Bose-Einstein condensates
Andrew J. Groszek, David M. Paganin, Kristian Helmerson +1
We derive a general and exact equation of motion for a quantised vortex in an inhomogeneous two-dimensional Bose-Einstein condensate. This equation expresses the velocity of a vort…
Vortex Thermometry for Turbulent Two-Dimensional Fluids
Andrew J. Groszek, Matthew J. Davis, David M. Paganin +2
We introduce a new method of statistical analysis to characterise the dynamics of turbulent fluids in two dimensions. We establish that, in equilibrium, the vortex distributions ca…
Einstein-Bose condensation of Onsager vortices
Rahil N. Valani, Andrew J. Groszek, Tapio P. Simula
We have studied statistical mechanics of a gas of vortices in two dimensions. We introduce a new observable---a condensate fraction of Onsager vortices---to quantify the emergence…
Hamiltonian dynamics of two same-sign point vortices
Anderson V. Murray, Andrew J. Groszek, Pekko Kuopanportti +1
We have studied numerically the Hamiltonian dynamics of two same-sign point vortices in an effectively two-dimensional, harmonically trapped Bose-Einstein condensate. We have found…
Onsager vortex formation in Bose-Einstein condensates in two-dimensional power-law traps
Andrew J. Groszek, Tapio P. Simula, David M. Paganin +1
We study computationally dynamics of quantised vortices in two-dimensional superfluid Bose-Einstein condensates confined in highly oblate power-law traps. We have found that the fo…