Three-wire magnetic trap for direct forced evaporative cooling

Received 24 September 2008; published 8 January 2009We propose a simple three-wire-based magnetic trap potential for direct forced evaporative cooling ofneutral atoms without using induced spin-flip technologies. We have devised a method for controlling the trapdepth without sacrificing its frequencies by only varying wire currents and external magnetic fields. By havingmultiples of these wires on different levels integrated into an atom chip, it is possible to attain Bose-Einsteincondensation without the conventional forced evaporation technique.DOI: 10.1103/PhysRevA.79.013407 PACS number s : 37.10.Gh, 37.10.De, 03.75.Be, 85.85. j