Zobrazeno 1 - 10
of 198
pro vyhledávání: '"McGuirk, J P"'
Publikováno v:
Phys. Rev. A 97, 051603 (2018)
We study the stability of two-domain spin structures in an ultra-cold gas of magnetically trapped $^{87}$Rb atoms above quantum degeneracy. Adding a small effective magnetic field gradient stabilizes the domains via coherent collective spin rotation
Externí odkaz:
http://arxiv.org/abs/1803.01096
Autor:
Graham, S. D., McGuirk, J. M.
Publikováno v:
Phys. Rev. A 95, 023602 (2017)
We present mean-field calculations of azimuthally averaged retarded dipole-dipole interactions in a Bose-Einstein condensate induced by a laser, at both long and short wavelengths. Our calculations demonstrate that dipole-dipole interactions become s
Externí odkaz:
http://arxiv.org/abs/1610.05477
Publikováno v:
Phys. Rev. Lett. 115, 075302 (2015)
Longitudinal spin diffusion of two pseudo-spin domains is studied in a trapped $^{87}$Rb sample above quantum degeneracy, and the effect of coherence in the domain wall on the dynamics of the system is investigated. Coherence in a domain wall leads t
Externí odkaz:
http://arxiv.org/abs/1501.03866
Autor:
McGuirk, J. M., Zajiczek, L. F.
Publikováno v:
Phys. Rev. A 83, 013625 (2011)
We study the collapse and revival of coherence induced by dipolar spin waves in a trapped gas of Rb-87 atoms. In particular we observe spatially localized collapse and revival of Ramsey fringe contrast and show how the pattern of coherence depends on
Externí odkaz:
http://arxiv.org/abs/1008.4428
Autor:
McGuirk, J. M., Zajiczek, L. F.
Publikováno v:
New J. of Phys. 12, 103020 (2010)
We demonstrate a technique for exciting spin waves in an ultracold gas of Rb-87 atoms based on tunable AC Stark potentials. This technique allows us to excite normal modes of spin waves with arbitrary amplitudes in the trapped gas, including dipole,
Externí odkaz:
http://arxiv.org/abs/1007.4339
Autor:
McGuirk, J. M.
Publikováno v:
Phys. Rev. A 82, 011612(R) (2010)
We report direct measurements of spin transport in a trapped, partially condensed spinor Bose gas. Detailed analyses of spin flux in this out-of-equilibrium quantum gas are performed by monitoring the flow of atoms in different hyperfine spin states.
Externí odkaz:
http://arxiv.org/abs/1005.5174
Publikováno v:
Phys.Rev.A72:033610,2005
We have performed a measurement of the Casimir-Polder force using a magnetically trapped 87-Rb Bose-Einstein condensate. By detecting perturbations of the frequency of center-of-mass oscillations of the condensate perpendicular to the surface, we are
Externí odkaz:
http://arxiv.org/abs/cond-mat/0506208
A magnetically trapped 87Rb Bose-Einstein condensate is used as a sensitive probe of short-range electrical forces. In particular, the electric polarization of, and the subsequent electric field generated by, 87Rb adsorbates on conducting and insulat
Externí odkaz:
http://arxiv.org/abs/cond-mat/0403254
We investigate the relationship between the coherence of a partially Bose-condensed spinor gas and its temperature. We observe cooling of the normal component driven by decoherence as well the effect of temperature on decoherence rates.
Comment:
Comment:
Externí odkaz:
http://arxiv.org/abs/cond-mat/0309253
We have measured magnetic trap lifetimes of ultra-cold Rb87 atoms at distances of 5-1000 microns from surfaces of conducting metals with varying resistivity. Good agreement is found with a theoretical model for losses arising from near-field magnetic
Externí odkaz:
http://arxiv.org/abs/cond-mat/0307546