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Q: Quantenoptik und Photonik
Q 75: Kurzvorträge zum Symposium Mesoskopische Physik ultrakalter Atome (SYUA)
Q 75.2: Talk
Wednesday, March 9, 2005, 16:15–16:30, HU Audimax
Simple models of ordinary conductivity with cold atoms in optical lattices — •Andrey Kolovsky1,2, Javier Madroñero1, and Andreas Buchleitner1 — 1Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, D-01187 Dresden — 2Kirensky Institute of Physics, Ru-660036 Krasnoyarsk
Ordinary (Ohm) conductivity results from the nontrivial interplay between the coherent dynamics of the carriers (manifest in Bloch oscillations) and relaxation processes (i.e., some interaction with the environment). We discuss two simple models for the conductivity of neutral atoms across optical lattices. In the first model, the effect of the environment is realized through (experimentally easily tunable) spontaneous emission. The second model studies the dynamics of spin-polarized (and, hence, non-interacting) Fermi atoms, upon admixure of a small fraction of bosonic atoms. The latter induces the collisional relaxation of the Bloch oscillations of the spin-polarized sample.