Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 75: Transport: Majorana fermions (organized by TT)

HL 75.8: Vortrag

Mittwoch, 2. April 2014, 17:15–17:30, HSZ 03

Majorana Fermions in Antiferromagnetically doped Superconductors — •Andreas Heimes, Panagiotis Kotetes, and Gerd Schön — Institut für Theoretische Festkörperphysik and DFG-Center for Functional Nanostructures, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany

Recently the field of Majorana fermions (MFs) in solid state physics has attracted great attention. Among the many existing proposals for their experimental realization and detection, one can distinguish a class of self-tuned MF systems, consisting of spiral spin chains on s-wave superconductors. We propose an alternative MF platform based on a chain of antiferromagnetically (AFM) ordered magnetic impurities on top of a conventional superconductor, which has the advantage that it allows for an external tunability by experimental parameters: The transition to the MF regime is achieved and controlled by the combination of a supercurrent flow and a Zeeman field. In fact, the latter can be considerably weak since the presence of the AFM order relaxes the requirement of a large Zeeman energy. Evenmore, the currently existing STM technology renders our proposal directly experimentally accessible.