Pulsed Quantum Tunneling with Matter Waves

Details Pulsed Quantum Tunneling with Matter Waves Pulsed Quantum Tunneling with Matter Waves

2001-06-24

arxiv.org/abs/cond-mat/0106493v1

Laser Physics 12, 198-202 (2002)

Physics

Condensed Matter

Soft Condensed Matter

9 pages, 5 figures, report for the X International Laser Physics Workshop, Seminar on Bose-Einstein Condensation of Trapped At

Scientific paper

In this report we investigate the macroscopic quantum tunneling of a Bose condensate falling under gravity and scattering on a Gaussian barrier that could model a mirror of far-detuned sheet of light. We analyze the effect of the inter-atomic interaction and that of a transverse confining potential. We show that the quantum tunneling can be quasi-periodic and in this way one could generate coherent Bose condensed atomic pulses. In the second part of the report, we discuss an effective 1D time-dependent non-polynomial nonlinear Schrodinger equation (NPSE), which describes cigar-shaped condensates. NPSE is obtained from the 3D Gross-Pitaevskii equation by using a variational approach. We find that NPSE gives much more accurate results than all other effective 1D equations recently proposed.

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