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Incorporating relativistic physics into quantum tunneling can lead to exoticbehavior such as perfect transmission via Klein tunneling. Here, we probe thetunneling properties of spin-momentum locked relativistic fermions by designingand implementing a tunneling geometry that utilizes nanowires of thetopological Kondo insulator candidate, SmB6. The nanowires are attached to theend of scanning tunneling microscope tips, and used to image the bicollinearstripe spin-order in the antiferromagnet Fe1.03Te with a Neel temperature of~50 K. The antiferromagnetic stripes become invisible above 10 K concomitantwith the suppression of the topological surface states. We further demonstratethat the direction of spin-polarization is tied to the tunneling direction. Ourtechnique establishes SmB6 nanowires as ideal conduits for spin-polarizedcurrents.

Spin-selective tunneling from nanowires of the candidate topological Kondo insulator SmB6