Skip to content

UltraCold Atom News

Personal tools
Home » News » BEC on a chip goes wireless in Amsterdam

BEC on a chip goes wireless in Amsterdam

Back to News

First observation: BEC!

Group: Spreeuw

Authors and contributors: René Gerritsma, Thomas Fernholz, Iuliana Barb, Shannon Whitlock, Robert Spreeuw. The chip was fabricated by Yu Tao Xing, in collaboration with the group of Jeroen Goedkoop.

We have recently reached BEC in 87Rb on a permanent magnet atom chip. The chip consists of a piece of magnetized FePt foil, cut into an "F"-like shape. It is in-plane magnetized and designed to produce a self-biasing Ioffe-Pritchard trap that would persist in the absence of any external magnetic fields. Atoms from a mirror MOT are transported into the FePt trap by applying uniform external magnetic fields. Once the atoms have been loaded we switch off all power supplies.

The condensation occurs after forced RF evaporation at about Tc = 1.1 µK with 6000 atoms. Further evaporation leaves us with a pure condensate of about 1500 atoms. The measured trap frequencies are 130 Hz (axial) and 5.5 kHz (radial). The first unambiguous observation was on Thu. 17 August 2006.

Due to the permanent magnetization we cannot switch the trap off to do free-space expansion. Instead we launch the atoms away from the surface and image them after expansion in a region of low field gradient. Additional diagnostics are obtained by RF spectroscopy.

Posted: 04 Oct 2006     Date: 17 Aug 2006

Chaotic paths to cold atom physics
10 Feb 2018
Jagiellonian University, Krakow, Poland
Quantum Optics 2018
25 Feb 2018
Obergurgl, Austria

© 2005-2018
Contact us | About the site | Link to the site