Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 3: Transport: Quantum Dots, Quantum Wires, Point Contacts
TT 3.11: Vortrag
Montag, 20. März 2017, 12:15–12:30, HSZ 201
Dynamic response functions, helical gaps, and fractional charges in quantum wires — •Christopher Pedder1, Tobias Meng2, Rakesh P. Tiwari3, and Thomas L. Schmidt2 — 1Physics and Materials Science Research Unit, University of Luxembourg, L-1511 Luxembourg — 2Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany — 3Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
We show how experimentally accessible dynamic response functions can discriminate between helical gaps due to magnetic field, and helical gaps driven by electron-electron interactions (“umklapp gaps”). The latter are interesting since they feature gapped quasiparticles of fractional charge e/2, and - when coupled to a standard superconductor - an 8π-Josephson effect and topological zero energy states bound to interfaces.