Zobrazeno 1 - 10
of 48
pro vyhledávání: '"J L Helm"'
Publikováno v:
New Journal of Physics, Vol 21, Iss 5, p 053019 (2019)
We study the dynamics of a soliton-impurity system modeled in terms of a binary Bose–Einstein condensate. This is achieved by ‘switching off’ one of the two self-interaction scattering lengths, giving a two component system where the second com
Externí odkaz:
https://doaj.org/article/e3c73afcfa3d47bfb3d0a1188e72a4ab
Publikováno v:
New Journal of Physics, Vol 20, Iss 4, p 043004 (2018)
We study interactions between bright matter-wave solitons which acquire chiral transport dynamics due to an optically-induced density-dependent gauge potential. Through numerical simulations, we find that the collision dynamics feature several non-in
Externí odkaz:
https://doaj.org/article/3ca11804ce8f4993b984bf7da5fa4158
Publikováno v:
Communications Physics, Vol 3, Iss 1, Pp 1-9 (2020)
Communications physics, 2020, Vol.3, pp.51 [Peer Reviewed Journal]
Communications physics, 2020, Vol.3, pp.51 [Peer Reviewed Journal]
Solitons are long-lived wavepackets that propagate without dispersion and exist in a wide range of one-dimensional (1D) nonlinear systems. A Bose-Einstein condensate trapped in a quasi-1D waveguide can support bright-solitary-matter waves (3D analogu
Autor:
D. H. White, D. J. Brown, Thomas A. Haase, J. L. Helm, Maarten Hoogerland, David Hutchinson, Daniel Schumayer, Mojdeh S. Najafabadi, Christopher Gies
Publikováno v:
Nature Communications
Nature Communications, Vol 11, Iss 1, Pp 1-8 (2020)
Nature Communications, Vol 11, Iss 1, Pp 1-8 (2020)
Anderson localisation -- the inhibition of wave propagation in disordered media -- is a surprising interference phenomenon which is particularly intriguing in two-dimensional (2D) systems. While an ideal, non-interacting 2D system of infinite size is
Publikováno v:
Physical review letters, 2018, Vol.120(6), pp.063201 [Peer Reviewed Journal]
We propose a method of atom-interferometry using a spinor Bose-Einstein condensate (BEC) with a time-varying magnetic field acting as a coherent beam-splitter. Our protocol creates long-lived superpositional counterflow states, which are of fundament
Publikováno v:
New Journal of Physics. 21:053019
We study the dynamics of a soliton-impurity system modeled in terms of a binary Bose-Einstein condensate. This is achieved by `switching off' one of the two self-interaction scattering lengths, giving a two component system where the second component
Autor:
J. L. Helm, Ana Rakonjac, M. M. H. Yu, Simon A. Gardiner, T. P. Billam, Simon L. Cornish, A. L. Marchant
Publikováno v:
Physical review A, 2016, Vol.93(1), pp.013607 [Peer Reviewed Journal]
We report observations of the formation and subsequent decay of a vortex lattice in a Bose-Einstein condensate confined in a hybrid optical-magnetic trap. Vortices are induced by rotating the anharmonic magnetic potential that provides confinement in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f3dee4de7cbcd95b86962cde9dba3e9c
http://arxiv.org/abs/1510.04897
http://arxiv.org/abs/1510.04897
Publikováno v:
Physical review letters, 2015, Vol.114(13), pp.134101 [Peer Reviewed Journal]
We use an effective one-dimensional Gross-Pitaevskii equation to study bright matter-wave solitons held in a tightly confining toroidal trapping potential, in a rotating frame of reference, as they are split and recombined on narrow barrier potential
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c82051183c1767b2feff7997503c665d
http://dro.dur.ac.uk/15260/
http://dro.dur.ac.uk/15260/
Autor:
M. M. H. Yu, A. L. Marchant, J. L. Helm, T. P. Billam, J. Polo, Simon A. Gardiner, Ana Rakonjac, Simon L. Cornish, Christoph Weiss
Publikováno v:
Physical review A, 2016, Vol.93(2), pp.021604(R) [Peer Reviewed Journal]
We report the observation of quantum reflection from a narrow, attractive, potential using bright solitary matter-waves formed from a 85Rb Bose-Einstein condensate. We create narrow potentials using a tightly focused, red-detuned laser beam, and obse
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bafc49e10894359e0df25c6f71d291ae
Publikováno v:
Physical review A : atomic, molecular and optical physics, 2014, Vol.89(3), pp.033610 [Peer Reviewed Journal]
We study bright solitons in the Gross-Pitaevskii equation as they are split and recombined in a low energy system. We present new analytic results determining the general region in which a soliton may not be split on a potential barrier, and confirm