2017/08/31 by Wenjie Ji, Xiao-Gang Wen · 2 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics #Quantum many-body systems #Topological Materials and Phenomena #cond-mat.mes-hall #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.120.107002
published as Phys. Rev. Lett. 120, 107002 (2018) · 6 pages, 4 figures. The T=0 calculation is updated for a more general situation (k_F=/=0). The results are not affected
openalex created_date 2017/08/31 · arxiv created 2017/10/24 · openalex publication_date 2018/03/09 · arxiv updated 2018/03/13 · openalex updated_date 2026/08/06
We address the question about the origin of the 1/2(e2/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(e2/h) conductance plateau. We find the 1/2(e2/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 σSC-Hall∝V2 in the kBT≪eV limit, if the SC and IQH bulks are fully gapped.