Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 27: Poster Quantengase
Q 27.11: Poster
Dienstag, 11. März 2008, 16:30–19:00, Poster C2
From BEC to fermionization in 1-D double-well traps — •Sascha Zöllner1, Hans-Dieter Meyer1, and Peter Schmelcher1,2 — 1Universitaet Heidelberg, Theoretische Chemie, Im Neuenheimer Feld 229, 69120 Heidelberg — 2Universitaet Heidelberg, Physikalisches Institut, Philosophenweg 12, 69120 Heidelberg
We investigate the transition of a quasi-one-dimensional few-boson system from weak correlations to the fermionization limit of infinitely repulsive forces. Based on a numerically exact multi-configurational method (MCTDH), we show that the ground state reveals `localization' of the particles, which can be interpreted as mimicking Pauli's exclusion principle. We provide a deeper understanding of that transition by relating it to the loss of coherence in the one-body density matrix and to the emerging long-range tail in the momentum distribution.
This crossover has striking effects on the tunnel dynamics of few atoms in a double well. Starting from Rabi oscillations in the noninteracting limit, correlated pair tunneling evolves as the interaction is slightly increased, reminiscent of self-trapping for BECs. Toward the fermionization limit, however, we observe modulated Rabi oscillations of a strongly correlated atom pair.