1/2 (e[superscript 2]/h) Conductance Plateau without 1D Chiral Majorana Fermions
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...
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| Format: | Article |
| Language: | English |
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American Physical Society
2018
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| Online Access: | http://hdl.handle.net/1721.1/117366 https://orcid.org/0000-0002-1979-6710 https://orcid.org/0000-0002-5874-581X |
| _version_ | 1826189671630110720 |
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| author | Ji, Wenjie Wen, Xiao-Gang |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Ji, Wenjie Wen, Xiao-Gang |
| author_sort | Ji, Wenjie |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T08:19:36Z |
| format | Article |
| id | mit-1721.1/117366 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:19:36Z |
| publishDate | 2018 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1173662022-09-23T12:20:25Z 1/2 (e[superscript 2]/h) Conductance Plateau without 1D Chiral Majorana Fermions Ji, Wenjie Wen, Xiao-Gang Massachusetts Institute of Technology. Department of Physics Ji, Wenjie Wen, Xiao-Gang 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. National Science Foundation (U.S.) (Grant DMR1506475) National Natural Science Foundation (China) (Grant 11274192) 2018-08-14T19:39:06Z 2018-08-14T19:39:06Z 2018-03 2017-08 2018-03-15T18:00:53Z Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/117366 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 https://orcid.org/0000-0002-1979-6710 https://orcid.org/0000-0002-5874-581X en http://dx.doi.org/10.1103/PhysRevLett.120.107002 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Ji, Wenjie Wen, Xiao-Gang 1/2 (e[superscript 2]/h) Conductance Plateau without 1D Chiral Majorana Fermions |
| title | 1/2 (e[superscript 2]/h) Conductance Plateau without 1D Chiral Majorana Fermions |
| title_full | 1/2 (e[superscript 2]/h) Conductance Plateau without 1D Chiral Majorana Fermions |
| title_fullStr | 1/2 (e[superscript 2]/h) Conductance Plateau without 1D Chiral Majorana Fermions |
| title_full_unstemmed | 1/2 (e[superscript 2]/h) Conductance Plateau without 1D Chiral Majorana Fermions |
| title_short | 1/2 (e[superscript 2]/h) Conductance Plateau without 1D Chiral Majorana Fermions |
| title_sort | 1 2 e superscript 2 h conductance plateau without 1d chiral majorana fermions |
| url | http://hdl.handle.net/1721.1/117366 https://orcid.org/0000-0002-1979-6710 https://orcid.org/0000-0002-5874-581X |
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