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Current noises in a topological Josephson junction

  • Yu-Hang Li
  • Jie Liu
  • JunTao Song
  • Hua JiangEmail author
  • Qing-Feng Sun
  • XinCheng XieEmail author
Article

Abstract

We study the transport properties of a superconductor-quantum spin Hall insulator-superconductor Josephson junction both in the absence and in the presence of a DC bias voltage. As the system is predicted to host Majorana fermions at its interfaces, the Andreev bond states are supposed to exhibit a distinct 4π periodicity in the superconducting phase difference, namely the fractional Josephson effect. Using the non-equilibrium Green’s function method, we calculate the current and the related current noise based on a tight-binding Hamiltonian. Our direct results show that the fractional Josephson effect can not be seen in equilibrium junctions. While in non-equilibrium junctions, this effect can be confirmed by the multiple Andreev reflections induced peaks of the non-equilibrium noise, which appear at discrete frequencies ω = neV with n being an integer number.

Keywords

Majorana fermions Josephson junction current noise non-equilibrium Green’s function 

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.International Center for Quantum Materials, School of PhysicsPeking UniversityBeijingChina
  2. 2.Department of Applied Physics, School of ScienceXi’an Jiaotong UniversityXi’anChina
  3. 3.Department of Physics and Hebei Advanced Thin Film LaboratoryHebei Normal UniversityShijiazhuangChina
  4. 4.College of Physics, Optoelectronics and EnergySoochow UniversitySuzhouChina
  5. 5.Collaborative Innovation Center of Quantum MatterBeijingChina
  6. 6.CAS Center for Excellence in Topological Quantum ComputationUniversity of Chinese Academy of SciencesBeijingChina

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