Parity independence of the zerobias conductance peak in a nanowire based topological superconductorquantum dot hybrid device
Abstract
We explore the signatures of Majorana fermions in a nanowire based topological superconductorquantum dottopological superconductor hybrid device by charge transport measurements. At zero magnetic field, welldefined Coulomb diamonds and the Kondo effect are observed. Under the application of a finite, sufficiently strong magnetic field, a zerobias conductance peak structure is observed. It is found that the zerobias conductance peak is present in many consecutive Coulomb diamonds, irrespective of the evenodd parity of the quasiparticle occupation number in the quantum dot. In addition, we find that the zerobias conductance peak is in most cases accompanied by two differential conductance peaks, forming a triplepeak structure, and the separation between the two side peaks in bias voltage shows oscillations closely correlated to the background Coulomb conductance oscillations of the device. The observed zerobias conductance peak and the associated triplepeak structure are in line with Majorana fermion physics in such a hybrid topological system.
 Publication:

Scientific Reports
 Pub Date:
 December 2014
 DOI:
 10.1038/srep07261
 arXiv:
 arXiv:1406.4435
 Bibcode:
 2014NatSR...4E7261D
 Keywords:

 Condensed Matter  Superconductivity;
 Condensed Matter  Mesoscale and Nanoscale Physics
 EPrint:
 6 pages, 4 figures