title: Parity independence of the zero-bias conductance peak in a nanowire based topological superconductor-quantum dot hybrid device.
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.
authors.affiliation: Division of Solid State Physics, Lund University, Box 118, S-221 00 Lund, Sweden.
authors.forename: M T
authors.initials: MT
authors.lastname: Deng
authors.affiliation: Division of Solid State Physics, Lund University, Box 118, S-221 00 Lund, Sweden.
authors.forename: C L
authors.initials: CL
authors.lastname: Yu
authors.affiliation: Division of Solid State Physics, Lund University, Box 118, S-221 00 Lund, Sweden.
authors.forename: G Y
authors.initials: GY
authors.lastname: Huang
authors.affiliation: Division of Solid State Physics, Lund University, Box 118, S-221 00 Lund, Sweden.
authors.forename: M
authors.initials: M
authors.lastname: Larsson
authors.affiliation: Division of Solid State Physics, Lund University, Box 118, S-221 00 Lund, Sweden.
authors.forename: P
authors.initials: P
authors.lastname: Caroff
authors.affiliation: 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.
authors.forename: H Q
authors.initials: HQ
authors.lastname: Xu