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Sci Rep. 2014 Dec 1;4:7261. doi: 10.1038/srep07261.

Parity independence of the zero-bias conductance peak in a nanowire based topological superconductor-quantum dot hybrid device.

Author information

1
Division of Solid State Physics, Lund University, Box 118, S-221 00 Lund, Sweden.
2
1] Division of Solid State Physics, Lund University, Box 118, S-221 00 Lund, Sweden [2] Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, China.

Abstract

We explore the signatures of Majorana fermions in a nanowire based topological superconductor-quantum dot-topological superconductor hybrid device by charge transport measurements. At zero magnetic field, well-defined Coulomb diamonds and the Kondo effect are observed. Under the application of a finite, sufficiently strong magnetic field, a zero-bias conductance peak structure is observed. It is found that the zero-bias conductance peak is present in many consecutive Coulomb diamonds, irrespective of the even-odd parity of the quasi-particle occupation number in the quantum dot. In addition, we find that the zero-bias conductance peak is in most cases accompanied by two differential conductance peaks, forming a triple-peak 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 zero-bias conductance peak and the associated triple-peak structure are in line with Majorana fermion physics in such a hybrid topological system.

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