Hannover 2003 – wissenschaftliches Programm
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Q: Quantenoptik
Q 20: Teilchenoptik
Q 20.4: Vortrag
Dienstag, 25. März 2003, 15:00–15:15, F107
Two-wire guides and electrostatic fields on atom chips — •X. Luo1, K. Brugger1, P. Krüger1, M. Klein1, S. Wildermuth1, H. Gimpel1, R. Folman1, S. Groth1,2, I. Bar-Joseph2, and J. Schmiedmayer1 — 1Physikalisches Institut, Universität Heidelberg — 2Weizmann Institute of Science, Rehovot, Israel
Atom chips provide a great variety of potential configurations to trap and guide neutral atoms. Here, we report on recent results obtained with thermal 7Li atoms: In a first series of experiments, we loaded a spiral shaped magnetic two-wire guide. In contrast to the regularly used single-wire side guide, the potential minimum is formed by two counter-propagating currents together with a homogeneous bias field in the direction perpendicular to the chip surface. The symmetry of this configuration allows guiding in arbitrary directions on the chip.
In a second experiment, electrostatic fields were employed to modulate the potential of a side guide in the longitudinal direction in order to form three-dimensional traps. The additional degree of freedom provided by electric fields opens up a variety of new possibilities, ranging from pushing atoms in a desired direction in a guide to state selective qubit operation.