Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 14: Quantengase: Bosonen 2

Q 14.4: Talk

Monday, March 12, 2012, 17:15–17:30, V47.02

Noise induced transport in optical lattices — •Stephan Burkhardt and Sandro Wimberger — Institute for Theoretical Physics, University of Heidelberg

It is well known that condensates in optical lattices undergo Bloch oscillations in the presence of a static force. In addition to these oscillations, tunneling into higher bands can be observed. Our work focuses on how this tunneling can be influenced by noise.

We address the problem of a Bose-Einstein condensate in a tilted bichromatic lattice with added phase noise. For this problem, we present a scaling function that describes the intraband tunneling rates in the regime of weak interactions [1]. From these results we observe that the intraband transport shows a clear maximum for certain noise parameters that can be predicted using the scaling function. Additionally, we characterize the well understood limits of very slow or fast noise which can be compared to reference cases.

Introducing mean-field interactions in the condensate, we finally discuss the interesting case of simultaneous presence of noise and nonlinearity.

[1] G. Tayebirad, R. Mannella, and S. Wimberger, Phys. Rev. A 84, 031605(R) (2011)