Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 31: SC: Tunnelling, Josephson Junctions

TT 31.7: Vortrag

Donnerstag, 25. März 2010, 11:00–11:15, H21

Spectroscopy of fractional Josephson vortex molecules — •Edward Goldobin, Tobias Gaber, Kai Buckenmaier, Uta Kienzle, Hanna Sickinger, Dieter Koelle, and Reinhold Kleiner — Physikalisches Institut – Experimentalphysik II and Center for Collective Quantum Phenomena, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany

Using tiny current injectors we create κ discontinuities of the Josephson phase in a long Josephson junction. The junction reacts at the discontinuities by creating fractional Josephson vortices of size λ_J pinned at them. Such vortices carry the flux Φ, which is a fraction of the magnetic flux quantum Φ₀≈2.07×10⁻¹⁵ Wb. Being pinned, a fractional vortex has an eigenfrequency (localized mode), which depends on κ and applied bias current, and which lays within the plasma gap. If one considers a molecule consisting of several coupled fractional vortices, the eigenfrequency will split into several modes. We report on spectroscopy of a fractional vortex molecule performed in the thermal regime.