Quantensysteme

Advanced Seminar on Condensed Matter Physics

Wintersemester 2014/2015

gehe zu Sommersemester 2014   gehe zu Sommersemester 2015

KIP SR 01.404
freitags 11:15

31.10.2014 11:15
Dr. Susanne Mertens, Lawrence Berkeley National Laboratory
KIP SR 01.404
14.11.2014 11:15
Dr. Sebastian Kempf, Kirchhoff-Institute for Physics, Heidelberg University
KIP SR 01.404
21.11.2014 11:15
Dr. Hannes Rotzinger, Physikalische Institute, KIT
KIP SR 01.404

At temperatures well below the superconducting transition temperature, thin superconducting wires respond in transport measurements quite similar to Josephson junctions. This behavior can be explained by the occurrence of superconducting quantum phase slips (QPS), which is conceptually dual to the dynamics of Josephson junctions. While in a Josephson junction the superconducting phase difference across a tunnel barrier drives the tunneling of Cooper pairs, the passing of a Cooper pair through a QPS wire is associated with the tunneling of the superconducting phase.
This duality can be studied using the QPS wire as a weak coupling element between two superconductors, e.g. by transport or microwave measurements. We have explored a new possibility of using metallic aluminium-oxide for obtaining a high kinetic inductance, a mandatory ingredient for the QPS effect in wires.
In the talk DC and microwave measurements of aluminium-oxide circuits will be presented.

28.11.2014 11:15
Prof. Dr. Georg Weiß, Physikalisches Institut, KIT
KIP SR 01.404
9.1.2015 11:15
Dr. Werner Rodejohann, Max-Planck Institute for Nuclear Physics, Heidelberg
KIP SR 01.404
23.1.2015 11:15
Prof. Alois Würger, LOMA, Université de Bordeaux
KIP SR 01.404
30.1.2015 11:15
  geplanter Vortrag ist abgesagt
Dr. Michael Willers, Physik-Department E15, Technische Universität München
KIP SR 01.404
6.2.2015 11:15
Prof. Dr. Ludwig Schultz, IFW Dresden, Institute of Metallic Materials
KIP SR 01.404

New means of urban transportation and logistics will become realistic with superconducting magnetic bearings using bulk high temperature superconductors. The advantage of superconducting magnetic levitation is that it works passively stable without any electronic control but with attracting and repelling forces to suspend a vehicle pendant or standing upright from zero to high speed - perfect conditions for the idea of rail-bound individual transport with cabins for 4 - 5 passengers requested call by call. They will levitate noiseless over the track made of RE permanent magnets saving energy and travel time. A big step forward to this vision has been made in Dresden. The world largest research and test facility for transport systems using HTS bulk material in the levitation and guidance system in combination with a permanent magnet track was put into operation. A vehicle for 2 passengers, equipped with linear drive propulsion, non-contact energy supply, second braking system and various test and measurement systems is running on an 80 m long oval driveway. In the presentation the principle of superconducting levitation by flux pinning in high temperature supercon¬ductors will be described. Based on this an overview of the SupraTrans II research facility and future directions of superconductivity-based magnetic levitation and bearing for automation technology, transportation and medical treatment under enhanced gravity will be given.

20.2.2015 11:15
Dr. Michael Willers, Physik-Department E15 Technische Universität München
KIP SR 01.404