Dr Ashton Bradley





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Dr Ashton Bradley

Dr Ashton Bradley

Senior Lecturer, Department of Physics
MSc (Auckland)
PhD (Victoria)
Room: 416
Phone: +64 3 479 4121
Fax: +64 3 479 0964


ArXiv preprints
Google Scholar

Quantum vortices formed in the wake of a translating obstacle potential.

Research Areas

My main interest is in degenerate quantum gases, with a current focus on


Visiting fellow

  • Jingyan Li, Wuhan Textile University, 2017
  • Chao-Fei Liu, Jiangxi University of Science and Technology, 2016


Current collaborations

Selected Publications

1. Vortices and Quantum Turbulence

Onsager-Kraichnan Condensation in Decaying Two-Dimensional Quantum Turbulence,
Thomas P. Billam, Matthew T. Reeves, Brian P. Anderson, and Ashton S. Bradley,
Physical Review Letters 112, 145301 (2014)

Characteristics of Two-Dimensional Quantum Turbulence in a Compressible Superfluid,
T. W. Neely, A. S. Bradley, E. C. Samson, S. J. Rooney, E. M. Wright, K. J. H. Law, R. Carretero-González, P. G. Kevrekidis, M. J. Davis, B. P. Anderson
Physical Review Letters 111, 235301 (2013)

Inverse Energy Cascade in Forced 2D Quantum Turbulence,
Matthew T. Reeves, Thomas P. Billam, Brian P. Anderson, Ashton S. Bradley
Physical Review Letters 110, 104501 (2013)

Energy spectra of vortex distributions in two-dimensional quantum turbulence,
A. S. Bradley and B. P. Anderson
Physical Review X 2, 041001 (2012)

Quantum tunneling of a vortex between two pinning potentials,
O. Fialko, A. S. Bradley, and J. Brand
Physical Review Letters 108, 015301 (2012)

Observation of vortex dipoles in an oblate Bose-Einstein condensate,
T. W. Neely, E. C. Samson, A. S. Bradley, M. J. Davis, B. P. Anderson,
Physical Review Letters 104, 160401 (2010)

2. Stochastic Gross-Pitaevskii Theory

Stochastic Projected Gross-Pitaevskii equation for spinor and multi-component condensates,
Ashton S. Bradley and P. Blair Blakie,
Physical Review A 90, 023631 (2014)

Kibble-Zurek scaling and its breakdown for spontaneous generation of Josephson vortices in Bose-Einstein condensates,
Shih-Wei Su, Shih-Chuan Gou, Ashton Bradley, Oleksandr Fialko, Joachim Brand
Physical Review Letters 110, 215302 (2013)

Stochastic projected Gross-Pitaevskii equation,
S. J. Rooney, P. B. Blakie, A. S. Bradley
Physical Review A 86, 053634 (2012)

Dynamics and statistical mechanics of Bose gases using c-field techniques,
P. B. Blakie, A. S. Bradley, M. J. Davis, R. J. Ballagh, C. W. Gardiner,
Advances in Physics 57, 363 (2008)

Spontaneous vortices in the formation of Bose-Einstein condensates,
C. N. Weiler, T. W. Neely, D. R. Scherer, A. S. Bradley, M. J. Davis, and B. P. Anderson,
Nature 455, 16 (2008)

Bose-Einstein condensation from a rotating thermal cloud: Vortex nucleation and lattice formation,
A. S. Bradley, C. W. Gardiner, and M. J. Davis,
Physical Review A 77, 033616 (2008)

3. Atom Lasers and Quantum Information

Coherence and linewidth of a continuously pumped atom laser at finite temperature,
Geoffrey M. Lee, Simon A. Haine, Ashton S. Bradley, Matthew J. Davis, Physical Review A 92, 013605 (2015), [arXiv]

Raman scheme to measure the quantum statistics of an atom laser beam,
A. S. Bradley, M. K. Olsen, S. A. Haine, and J. J. Hope, Physical Review A 76, 033603 (2007)

Bright tripartite entanglement in triply concurrent parametric oscillation,
A. S. Bradley, M. K. Olsen, O. Pfister, R. C. Pooser, Physical Review A 72, 053805 (2005)

Theses Supervised (Main Advisor)



C-Field Theory of Dynamics in One Dimensional Bose Gases: The Kibble-Zurek Mechanism and Bright Soliton Arrest, Rob McDonald, (Otago 2015)

Inverse Energy Cascade in Two-Dimensional Quantum Turbulence, Matthew T. Reeves, (Otago 2013)

C-field description of the quasi-equilibrium Bose gas: Persistent currents and kelvon-induced vortex decay, Samuel J. Rooney, (Otago 2012)


Quantum Analogues of Two-Dimensional Classical Turbulence, Matthew T. Reeves, (Otago 2017)

Implementation and Applications of the Stochastic Projected Gross-Pitaevskii Equation, Samuel J. Rooney, (Otago 2015)

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