Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 10: Quantum Gases: Bosons II

Q 10.7: Talk

Monday, March 8, 2010, 18:00–18:15, E 001

Emergence of semifluxons in 0-π-0 junctions as a topological state change — •Reinhold Walser¹, Michael Grupp², Wolfgang Schleich², Oliver Crasser², Reinhold Kleiner³, and Edward Goldobin³ — ¹Institut für Angewandte Physik, TU Darmstadt — ²Institut für Quantenphysik, Universität Ulm — ³Physikalisches Institut, Universität Tübingen

By continuously increasing the spatial extend of the π-region in a long 0-π-0 Josephson junction, one can dynamically induce the appearance of semifluxons starting with a flat-phase state. Thus, we can control the topological nature of a quantum system with an external parameter. This interesting topological quantum state is related to ordinary quantized magnetic flux in superconductors or vortices in superfluid systems, however it has accrued only π-phase winding. In here, we present a generic, analytical model of the phenomenon and demonstrate its implementation in the context of ultra-cold matter waves using optical junctions.