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Special CMTC Seminar

Mon, Mar 21, 2016 2:00 pm - 3:30 pm
2205 Toll Physics Building


Speaker: Panagiotis Kotetes (NBI, Copenhagen)

Title: Signatures of Majorana fermions in Shiba chains with or without spin-orbit interaction

Abstract: Recent spin polarized scanning tunneling microscopy (SPSTM) experiments in magnetic chains [1] opened new routes for detecting the elusive Majorana fermions (MFs). Within the deep Shiba limit we calculate [2] the spatially resolved tunneling conductance of topological ferromagnetic chains [1,3] measurable by means of SPSTM. Our analysis reveals novel signatures of MFs arising from the interplay of their strongly anisotropic spin-polarization and the magnetization content of the tip. We investigate the occurrence and evolution of zero/finite bias peaks for a single or two coupled chains forming a Josephson junction, when a preexisting chiral symmetry controlling the number of MFs per chain edge is preserved or weakly broken. We also reveal alternative routes for engineering MFs without spin-orbit interaction (SOI). On one hand, we highlight that antiferromagnetic Shiba chains become topological by inducing an artificial SOI using external fields [4], while on the other, we pursue mechanisms for stabilizing magnetic textures and topological Shiba lattices following the self-organization principle for topological spiral chains [5].

[1] S. Nadj-Perge et al., Science 346, 602 (2014).
[2] P. Kotetes et al., Physica E 74, 614 (2015).
[3] A. Heimes, D. Mendler, and P. Kotetes, New J. Phys. 17 023051 (2015).
[4] A. Heimes, P. Kotetes, and G. Schön, PRB 90, 060507(R) (2014).
[5] M. Schecter et al., arXiv:1509.07399.

Host: Jay Sau


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