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- T. Simula
- PhysicsQuantised Vortices
- 1 July 2019
I discuss in these lectures vortex-like classical solutions to the equations of motion of gauge theories with spontaneous symmetry breaking. Starting from the Nielsen-Olesen ansatz for the Abelian…
Evolution of large-scale flow from turbulence in a two-dimensional superfluid
- S. Johnstone, A. Groszek, P. Starkey, C. Billington, T. Simula, K. Helmerson
- 22 January 2018
Experimental confirmation of Lars Onsager’s model of turbulent flow of quantized vortices is reported, opening a pathway for quantitative studies of emergent structures in interacting quantum systems driven far from equilibrium.
Emergence of order from turbulence in an isolated planar superfluid.
This work demonstrates that after a period of vortex annihilation the remaining vortices self-organize into two macroscopic coherent "Onsager vortex" clusters that are stable indefinitely--despite the absence of driving or external dissipation in the dynamics.
Introduction to topological quantum computation with non-Abelian anyons
This work aims to provide a pedagogical, self-contained, review of topological quantum computation with Fibonacci anyons, from the braiding statistics and matrices to the layout of such a computer and the compiling of braids to perform specific operations.
Observations on sound propagation in rapidly rotating Bose-Einstein condensates.
- T. Simula, P. Engels, I. Coddington, V. Schweikhard, E. Cornell, R. Ballagh
- PhysicsPhysical review letters
- 14 July 2004
Repulsive laser potential pulses applied to vortex lattices of rapidly rotating Bose-Einstein condensates create propagating density waves which we have observed experimentally and modeled…
Vortex mass in a superfluid
- T. Simula
- 27 April 2017
We consider the inertial mass of a vortex in a superfluid. We obtain a vortex mass that is well defined and is determined microscopically and self-consistently by the elementary excitation energy of…
Kelvin waves of quantized vortex lines in trapped Bose-Einstein condensates.
A modified Kelvin wave dispersion relation for trapped superfluids is presented and a simple method to excite Kelvin waves of specific wave number is proposed.
Thermal activation of vortex-antivortex pairs in quasi-two-dimensional Bose-Einstein condensates.
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 producible…
Giant vortex lattice deformations in rapidly rotating bose-einstein condensates.
A mechanism which quantitatively explains the observed core oscillation phenomenon is provided, and the clear distinction between the mechanism of atom removal and a repulsive pinning potential in creating giant vortices is demonstrated.
Onsager vortex formation in Bose-Einstein condensates in two-dimensional power-law traps
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 formation of large…