Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 49: Poster Session: Superconductivity
TT 49.42: Poster
Mittwoch, 3. April 2019, 15:00–18:30, Poster D
Vortex dynamics in nanoscale Josephson junction parallel arrays — •Micha Wildermuth1, Amadeus Dieter1, Lukas Powalla1, Jan Nicolas Voss1, Yannick Schön1, Hannes Rotzinger1, and Alexey V. Ustinov1,2 — 1Physikalisches Institut, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany — 2Russian Quantum Center, National University of Science and Technology MISIS, Moscow 119049, Russia
A periodic arrangement of Josephson junctions is a toy model to experimentally study topological excitations in spatially modulated systems, e.g., dislocations in crystals, domain walls in various condensed matter systems, and dynamics of nonlinear lattices. Quantum limit for such lattices can be achieved by using ultra-small junctions, with their charging energy being on the order of Josephson energy. Using both ultra-small Josephson tunnel junctions and additional kinetic inductances in the array loops, we approach the quantum regime for both plasma oscillations and Josephson vortices and accompanied the interplay of charges and fluxoids in the array. Here, charge and magnetic flux become quantum-mechanical conjugated variables, wherefore the dynamics of spatially localized fluxoids entail local phase slips and concomitant charge quantum transfer across the junctions.
We present transport measurement of discrete parallel arrays of nanoscale Josephson junctions, observe appealing novel features in the current-voltage characteristics and compare them with the theoretical models.