TY  - JOUR
A1  - Negretti, Antonio
A1  - Henkel, Carsten
T1  - Enhanced phase sensitivity and soliton formation in an integrated BEC interferometer
N2  - We study the dynamics of Bose-Einstein condensates in time-dependent microtraps for the purpose of understanding the influence of the mean field interaction on the performance of interferometers. We identify conditions where the nonlinearity due to atom interactions increases the sensitivity of interferometers to a phase shift. This feature is connected with the adiabatic generation of a dark soliton. We analyse the robustness of this phenomenon with respect to thermal fluctuations, due to excited near fields in an electromagnetic surface trap
Y1  - 2004
UR  - http://ej.iop.org/links/q85/PfG7mUoiRHJEqjWjKfr+iQ/b4_23_l02.pdf
SN  - 0953-4075
ER  - 
TY  - JOUR
A1  - Henkel, Carsten
A1  - Gardiner, Simon A.
A1  - Negretti, Antonio
T1  - (De)coherence physics with condensates in microtraps
N2  - We discuss the dynamics of a condensate in a miniaturized electromagnetic trap formed above a microstructured substrate. Recent experiments have found that trap lifetimes get reduced when approaching the substrate because atoms couple to thermally excited near fields. The data agree quantitatively with our theory [Appl. Phys. B 69, 379 (1999)]. We focus on the decoherence of a quantum degenerate gas in a quasi-one-dimensional trap. Monte Carlo simulations indicate that atom interactions reduce the condensate decoherence rate. This is explained by a simple theory in terms of the suppression of long-wavelength excitations. We present preliminary simulation results for the adiabatic generation of dark solitons
Y1  - 2004
SN  - 1054-660X
ER  -