Anindya Das, Yuval Ronen, Yonatan Most, Yuval Oreg, Moty Heiblum, Hadas Shtrikman
Majorana fermions are the only fermionic particles that are expected to be their own antiparticles. While elementary particles of the Majorana type were not identified yet, quasi-particles, born from interacting electrons in the solid were predicted to form with Majorana like properties. Here, we present a thorough experimental and theoretical study of such a system, composed of an aluminum superconductor in contact with an indium arsenide nanowire, which possesses strong spin-orbit coupling - hence, an induced topological superconductor - having the necessary characteristics to support Majorana fermions at its end points. In particular, a distinct zero energy conductance peak appears with an applied small magnetic field (perpendicular to the spin-orbit effective field), which splits and later fades at higher fields. The peak is robustly tied to the Fermi energy over a wide range of system parameters. The peak is temperature broadened and disappears at ~100mK. We backup our assertions with numerical simulations based on measured parameters employing a scattering theory.
View original:
http://arxiv.org/abs/1205.7073
No comments:
Post a Comment