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TT: Fachverband Tiefe Temperaturen

TT 3: Transport: Quantum Dots, Quantum Wires, Point Contacts

TT 3.11: Talk

Monday, March 20, 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.