420 research outputs found
Spin modulation instabilities and phase separation dynamics in trapped two-component Bose condensates
In the study of trapped two-component Bose gases, a widely used dynamical protocol is to start from the ground state of a one-component condensate and then switch half the atoms into another hyperfine state. The slightly different intra-component and inter-component interactions can then lead to highly non-trivial dynamics, especially in the density mismatch between the two components, commonly referred to as 'spin' density. We study and classify the possible subsequent dynamics, over a wide variety of parameters spanned by the trap strength and by the inter- to intra-component interaction ratio. A stability analysis suited to the trapped situation provides us with a framework to explain the various types of dynamics in different regimes
I Am a Camera (May 9-10, 1969)
Program for I Am a Camera (May 9-10, 1969)
Cabaret
Set in Berlin during the rise of fascism, the people in a Caberet act struggle to come to terms with the political environment. Presented at John Carroll University, October 31-November 8, 2003.https://collected.jcu.edu/plays/1133/thumbnail.jp
Rydberg transitions induced by optical core dressing
We study theoretically the behavior of two atomic Rydberg series, coupled by a light field that strongly drives the optical transition between the core states to which these series converge. It is shown that this strong-field version of isolated-core excitation leads to a strong modification of the photoionization spectrum and to transitions between adjacent Rydberg states when the Rabi frequency associated with the core transition becomes larger than the Rydberg spacing. The intensities and pulse durations ( ~ 2 GW/cm2 and 1 ps, respectively, for n ~ 20 Rydberg states) needed for the observation of these effects are within reach of present-day lasers
The Damask Cheek (December 1-2, 1967)
Program for The Damask Cheek (December 1-2, 1967)
Multi-step Bose-Einstein Condensation of Trapped Ideal Bose Gases
The Phenomenon of multi-step Bose-Einstein condensation (BEC) of a finite
number of non-interacting bosons in anisotropic traps has been demonstrated by
studing the populations on eight subsets of states. The cusp in the specific
heat is found to be associated with the crossover between subsets of states
involving Bose functions of different classes, as specified by their
behaviour at . {PACS: 03.75.Fi, 05.30.-d, 64.60.-i}Comment: 12 Pages with 3 PS figure
Yang-Yang thermodynamics on an atom chip
We investigate the behavior of a weakly interacting nearly one-dimensional
(1D) trapped Bose gas at finite temperature. We perform in situ measurements of
spatial density profiles and show that they are very well described by a model
based on exact solutions obtained using the Yang-Yang thermodynamic formalism,
in a regime where other, approximate theoretical approaches fail. We use
Bose-gas focusing [Shvarchuck etal., Phys. Rev. Lett. 89, 270404 (2002)] to
probe the axial momentum distribution of the gas, and find good agreement with
the in situ results.Comment: extended introduction and conclusions, and minor changes throughout;
accepted for publication in Phys. Rev. Let
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