1/2 (e[superscript 2]/h) Conductance Plateau without 1D Chiral Majorana Fermions
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PhysRevLett.120.107002.pdf
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Author(s)
Ji, Wenjie
Wen, Xiao-Gang
Date Issued
March 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Ji, Wenjie, and Xiao-Gang Wen. “1/2 (e[superscript 2]/h) Conductance Plateau without 1D Chiral Majorana Fermions.” Physical Review Letters, vol. 120, no. 10, Mar. 2018. © 2018 American Physical Society
Version
Final published version
Abstract
We address the question about the origin of the 1/2(e[superscript 2]/h) conductance plateau observed in a recent experiment on an integer quantum Hall (IQH) film covered by a superconducting (SC) film. Since one-dimensional (1D) chiral Majorana fermions on the edge of the above device can give rise to the half quantized plateau, such a plateau is regarded as conclusive evidence for the chiral Majorana fermions. However, in this Letter we give another mechanism for the 1/2(e[superscript 2]/h) conductance plateau. We find the 1/2(e[superscript 2]/h) conductance plateau to be a general feature of a good electric contact between the IQH film and the SC film, and cannot distinguish the existence or the nonexistence of 1D chiral Majorana fermions. We also find that the contact conductance between a superconductor and an IQH edge channel has a non-Ohmic form σ[subscript SC-Hall]∝V[superscript 2] in the k[subscript B]T≪eV limit, if the SC and IQH bulks are fully gapped.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.120.107002
