Abstract
We observe a localized phase of ultracold bosonic quantum gases in a 3-dimensional optical lattice induced by a small contribution of fermionic atoms acting as impurities in a Fermi-Bose quantum gas mixture. In particular, we study the dependence of this transition on the fermionic (40)K impurity concentration by a comparison to the corresponding superfluid to Mott-insulator transition in a pure bosonic (87)Rb gas and find a significant shift in the transition parameter. The observed shift is larger than expected based on a simple mean-field argument, which indicates that disorder-related effects play a significant role.
| Original language | English |
|---|---|
| Pages (from-to) | 180403 |
| Number of pages | 1 |
| Journal | Physical Review Letters |
| Volume | 96 |
| DOIs | |
| Publication status | Published - 1 May 2006 |