Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 28: Poster Session: Topological Topics

TT 28.11: Poster

Montag, 12. März 2018, 15:00–19:00, Poster B

Majorana bound states in monoatomic Fe-nanowires on superconducting Pb — •Carl Drechsel, Rémy Pawlak, Marcin Kisiel, Jelena Klinowaja, Tobias Meier, Shigeki Kawai, Thilo Glatzel, Daniel Loss, and Ernst Meyer — Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland

Motivated by their potential use as topological qubits, Majorana bound states (MBS) have attracted an utmost interest. Theoretical calculations predict their occurrence in the combination of quasi-one-dimensional nanowire systems onto s-wave superconductors.

Here, we measure the spatial and electronic characteristics of topological, superconducting chains of iron atoms on Pb(110) to investigate the wave function and the localization length as fingerprint for MBSs [1]. After first observations by scanning tunneling microscopy (STM) [2,3], we demonstrate by combining STM and atomic force microscopy (AFM) at low temperature (< 5 K) that the Fe chains are mono-atomic, structured in a linear fashion, and exhibit zero-bias conductance peaks at their ends [4]. This can be interpreted as signature for a Majorana bound state [5]. From these observations, we strongly support the idea of using MBSs in Fe chains on superconducting Pb as qubits for quantum computing devices.
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M. Ruby et al., Phys. Rev. Lett. 115, 197 (2015)
R. Pawlak et al., npj Quantum Information, 16035 (2016)
V.Mourik et al., Science 336, 1003 (2012)