Angela White

Australian National University

ParticleQuantum vortexQuantum gravityPhysicsvan der Waals forceEuclidean geometrySpacetimeVortexGravitational fieldToroidTurbulenceOrbit (dynamics)VorticitySuperfluidityCondensed matter physicsThermometerQuantum turbulenceEvent (particle physics)Signature (topology)Ramsey interferometryQuantum fisher informationQuantum electrodynamicsObservableBose–Einstein condensateFlow (mathematics)Phase (matter)Symmetry (physics)Superfluid helium-4Quantum mechanicsLorentz covarianceClassical mechanicsQuantumAnisotropy

46Publications

11H-index

705Citations

Publications 30

Newest

#1Xuezhi Wang (RMIT: RMIT University)H-Index: 7

#2Allison KealyH-Index: 18

Last. Sam LeggeH-Index: 1

view all 14 authors...

While quantum accelerometers sense with extremely low drift and low bias, their practical sensing capabilities face two limitations compared with classical accelerometers: a lower sample rate due to cold atom interrogation time, and a reduced dynamic range due to signal phase wrapping. In this paper, we propose a maximum likelihood probabilistic data fusion method, under which the actual phase of the quantum accelerometer can be unwrapped by fusing it with the output of a classical accelerometer...

#1Tiantian Zhang (OIST: Okinawa Institute of Science and Technology)H-Index: 1

#2James Schloss (OIST: Okinawa Institute of Science and Technology)H-Index: 4

Last. Angela White (ANU: Australian National University)H-Index: 11

view all 6 authors...

A study of vortex dynamics in a confined superfluid shows that a system of three co-rotating quantum vortices and one vortex of opposite rotation exhibit chaotic dynamics. We find the onset of chaos is seeded through the close approach and separation of vortices in a scattering event.

#1Angela WhiteH-Index: 11

#2Thomas BuschH-Index: 28

Conservation of angular momentum depends on the existence of rotational symmetry. However, even in systems where this symmetry is broken, flipping between angular momentum eigenstates often requires an activation energy. Here we discuss an example of superfluid flow in a toroidal potential, which shows sustained oscillations between two different rotation directions. The energy required to change the direction of rotation is taken out of and temporarily restored into the rotational and intra-com...

#1A. CidrimH-Index: 5

#2Angela WhiteH-Index: 11

Last. Carlo F. BarenghiH-Index: 53

view all 5 authors...

We investigate a procedure to generate turbulence in a trapped Bose-Einstein condensate which takes advantage of the decay of multicharged vortices. We show that the resulting singly-charged vortices twist around each other, intertwined in the shape of helical Kelvin waves, which collide and undergo vortex reconnections, creating a disordered vortex state. By examining the velocity statistics, the energy spectrum, the correlation functions and the temporal decay, and comparing these properties w...

#1Angela White (OIST: Okinawa Institute of Science and Technology)H-Index: 11

#2Yongping Zhang (SHU: Shanghai University)H-Index: 18

Last. Thomas Busch (OIST: Okinawa Institute of Science and Technology)H-Index: 28

view all 3 authors...

We study the phase diagram of a Rashba spin-orbit-coupled Bose-Einstein condensate confined in a two-dimensional toroidal trap. In the immiscible regime we find an azimuthally periodic density distribution, with the periodicity highly tunable as a function of the spin-orbit-coupling strength and which favors an odd number of petals in each component. This allows for a wide range of states that can be created. We further show that in the miscible regime, both components possess states with persis...

#1Gustavo Deczka TellesH-Index: 11

#2Carlo F. BarenghiH-Index: 53

Last. Angela WhiteH-Index: 11

view all 8 authors...

#1Angela White (OIST: Okinawa Institute of Science and Technology)H-Index: 11

#2Tara Hennessy (OIST: Okinawa Institute of Science and Technology)H-Index: 5

Last. Thomas Busch (OIST: Okinawa Institute of Science and Technology)H-Index: 28

view all 3 authors...

Phase transitions can modify quantum behaviour on mesoscopic scales and give access to new and unusual quantum dynamics. Here we investigate the superfluid properties of a rotating two-component Bose--Einstein condensate as a function of changes in the interaction energy and in particular through the phase transition from miscibility to immiscibility. We show that the breaking of one of the hallmarks of superfluid flow, namely the quantisation condition on circulation, is continuous throughout a...

#1L. ORiordanH-Index: 6

#2Angela WhiteH-Index: 11

Last. Th. Busch (OIST: Okinawa Institute of Science and Technology)H-Index: 7

view all 3 authors...

Author(s): O'Riordan, LJ; White, AC; Busch, T | Abstract: © 2016 American Physical Society. Vortex lattices in rapidly rotating Bose-Einstein condensates lead to a periodic modulation of the superfluid density with a triangular symmetry. Here we show that this symmetry can be combined with an external perturbation in order to create superlattice structures with two or more periodicities. Considering a condensate that is kicked by an optical lattice potential, we find the appearance of transient ...

#1L. ORiordanH-Index: 6

#2Angela WhiteH-Index: 11

Last. Th. BuschH-Index: 7

view all 3 authors...

Twisted unwinding of multi-charged quantum vortex and generation of turbulence in atomic Bose-Einstein condensates

#1Gustavo Deczka TellesH-Index: 11

#2P. E. S. TavaresH-Index: 6

Last. Carlo F. BarenghiH-Index: 53

view all 8 authors...

We report the direct experimental observation of the twisted unwinding of multiply charged vortices in atomic Bose-Einstein condensates, which we model using the Gross-Pitaevskii equation. We show that, in the case of anti-parallel multiply charged vortices, the unwinding results in Kelvin waves which undergo vortex reconnections, generating an almost isotropic vortex tangle, which we characterize in terms of the statistics of the velocity field. This procedure opens a completely new route to in...

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