Frankfurt 2006 – wissenschaftliches Programm

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A: Atomphysik

A 6: Ultrakalte Atomphysik II: Dynamik mit Bose-Einstein Kondensaten

A 6.3: Vortrag

Dienstag, 14. März 2006, 14:45–15:00, H6

Atomic current across an optical lattice — •Alexey Ponomarev^1,2, Javier Madronero^1,3, Andrey Kolovsky^1,2, and Andreas Buchleitner¹ — ¹Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, D-01187 Dresden — ²Kirensky Institute of Physics, Ru-660036 Krasnoyarsk — ³Physik Department, Technische Universität München, James-Franck-Straße, D-85747 Garching

We devise a microscopic model for the emergence of a collision-induced, fermionic atomic current across a tilted optical lattice. Tuning the – experimentally controlable – parameters of the microscopic dynamics allows to switch from Ohmic to negative differential conductance. We show that relevant parameters can be calculated using the theory of (a)diabatic transitions between instanteneous eigenstates of a time-dependent Hamiltonian.

[1] A. V. Ponomarev, J. Madronero, A. R. Kolovsky, A. Buchleitner, cond-mat/0509602