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Adjustable microchip ringtraps for cold atoms and molecules.

Paul Baker, Air Force Research Laboratory

(Session : Thursday from )

Abstract. A description of the design and function of a circular magnetic waveguide for deBroglie waves on a microchip are discussed. The guide is a two-dimensional magnetic minimum for trapping weak-field seeking states of atoms or molecules with a magnetic dipole moment. The waveguide is created entirely by current carrying wires lithographically patterned on a single layer chip with or without vias. The design consists of overlapping three and four wire waveguides in a circle; about a common radius. We describe the geometry and time-dependent currents of the wires and show that it is possible to form a circular waveguide while minimizing perturbation resulting from leads or wire crossings. This maximal area geometry is suited for rotation sensing with atom interferometry via the Sagnac effect using either cold thermal atoms and molecules or Bose-condensed systems.