Zobrazeno 1 - 10
of 361
pro vyhledávání: '"Ragan, R"'
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:
Mullin, W. J., Ragan, R. J.
Recent experiments in a mixture of two hyperfine states of trapped Bose gases show behavior analogous to a spin-1/2 system, including transverse spin waves and other familiar Leggett-Rice-type effects. We have derived the kinetic equations applicable
Externí odkaz:
http://arxiv.org/abs/cond-mat/0606490
We study the spatial Fourier transform of the spin correlation function G_q(t) in paramagnetic quantum crystals by direct simulation of a 1d lattice of atoms interacting via a nearest-neighbor Heisenberg exchange Hamiltonian. Since it is not practica
Externí odkaz:
http://arxiv.org/abs/cond-mat/0502217
Publikováno v:
J. Low Temp. Phys. 126 (2002) 163-169
We show that there are restrictions on the maximum tipping angle that can be used without significantly raising the temperature of the He-3 distribution in high B/T spin-echo experiments with pure liquid He-3 and He3-He4 solutions. The temperature in
Externí odkaz:
http://arxiv.org/abs/cond-mat/0502221
Publikováno v:
J. Low Temp. Phys. 126 (2002) 45 -50
We study spin diffusion and spin waves in paramagnetic quantum crystals (solid He-3, for example) by direct simulation of a square lattice of atoms interacting via a nearest-neighbor Heisenberg exchange Hamiltonian. Recently, Cowan and Mullin have us
Externí odkaz:
http://arxiv.org/abs/cond-mat/0502214
A semiclassical method is used to study Landau damping of transverse pseudo-spin waves in harmonically trapped ultracold gases in the collisionless Boltzmann limit. In this approach, the time evolution of a spin is calculated numerically as it travel
Externí odkaz:
http://arxiv.org/abs/cond-mat/0502189
Autor:
Ragan, R., Baggett, J.
Publikováno v:
J. Low Temp. Phys. 134 (2004) 369-375
We present two results concerning the spin (or pseudo spin) dynamics of trapped quantum gases in the hydrodynamic regime described by the Leggett equations. First, we apply perturbation theory to extend the ``bounded diffusion'' description to trappe
Externí odkaz:
http://arxiv.org/abs/cond-mat/0502211
Autor:
Mullin, W. J., Ragan, R. J.
Recent experiments in a mixture of two hyperfine states of trapped Bose gases show behavior analogous to a spin-1/2 system, including transverse spin waves and other familiar Leggett-Rice-type effects. We have derived the kinetic equations applicable
Externí odkaz:
http://arxiv.org/abs/cond-mat/0401123
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