University of Birmingham > Talks@bham > Cold Atoms > Cold atom ratchets

Cold atom ratchets

Add to your list(s) Download to your calendar using vCal

  • UserFerruccio Renzoni (UCL)
  • ClockMonday 08 February 2010, 15:00-16:00
  • HousePhysics East 217.

If you have a question about this talk, please contact Vincent Boyer.

This talk has been canceled/deleted

Brownian motors, or ratchets, are devices which ``rectify” Brownian motion, i.e. they can generate a current of particles out of unbiased fluctuations.

We experimentally implemented a Brownian motor using cold atoms in an optical lattice. This is quite an unusual system for a Brownian motor as there is no a real thermal bath, and both the periodic potential for the atoms and the fluctuations are determined by laser fields.

With the help of such a system, we investigated experimentally the relationship between symmetry and transport in a 1D rocking ratchet, both in the periodic and in the quasiperiodic case. We then went beyond 1D rocking ratchets, demonstrating 1D gating ratchets. We also realized 2D rocking ratchets and demonstrated a rectification mechanism unique to these high-dimensional ratchets. Stabilization mechanisms associated to ac transport are also discussed.

This talk is part of the Cold Atoms series.

Tell a friend about this talk:

This talk is included in these lists:

This talk is not included in any other list

Note that ex-directory lists are not shown.


Talks@bham, University of Birmingham. Contact Us | Help and Documentation | Privacy and Publicity.
talks@bham is based on from the University of Cambridge.