Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 102: Topology: Majorana Fermions

TT 102.6: Talk

Thursday, March 15, 2018, 17:30–17:45, A 053

Synthetic spin orbit interaction for Majorana devices — •Lauriane Contamin¹, Matthieu Desjardins¹, Matthieu Dartiailh¹, Laure Bruhat¹, Tino Cubaynes¹, Jeremie Viennot², François Mallet¹, Stanislas Rohart³, André Thiaville³, Audrey Cottet¹, and Takis Kontos¹ — ¹Laboratoire Pierre Aigrain, Ecole Normale Supérieure-PSL Research University, CNRS, Université Pierre et Marie Curie-Sorbonne Universités, Université Paris Diderot-Sorbonne Paris Cité, Paris, France — ²JILA and Department of Physics, University of Colorado, Boulder, Colorado, USA — ³3Laboratoire de Physique des Solides, Université Paris-Sud et CNRS, Orsay, France

The engineering of Majorana modes in condensed matter systems could allow one to study excitations with particle/antiparticle duality and non-abelian statistics. Most of the experimental setups with nanoscale circuits use nanowires with strong spin-orbit interaction connected to superconductors. Theoretical proposals have suggested inducing a spin-orbit coupling through a magnetic texture. In this work, we demonstrate experimentally such a platform using a single wall carbon nanotube as a conductor, which naturally exhibit few conduction channels. It is stamped over a magnetic gate and coupled to two superconducting electrodes. We observe subgap states in the conductance. A detailed study of their magnetic field evolution reveals a large synthetic spin-orbit energy. Furthermore, a robust zero energy state, the hallmark of localized Majorana modes, emerges at zero magnetic field.