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Evidence of Majorana fermions in an Al - InAs nanowire topological superconductor | | Anindya Das
; Yuval Ronen
; Yonatan Most
; Yuval Oreg
; Moty Heiblum
; Hadas Shtrikman
; | | Date: |
31 May 2012 | | Abstract: | 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. | | Source: | arXiv, 1205.7073 | | Services: | Forum | Review | PDF | Favorites | |
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