Interfacial Superconductivity and Zero Bias Peak in Quasi‐One‐Dimensional Bi2Te3/Fe1+yTe Heterostructure Nanostructures
Abstract Bismuth telluride/iron telluride (Bi2Te3/Fe1+yTe) heterostructures are known to exhibit interfacial superconductivity between two non‐superconducting materials: Fe1+yTe as the parent compound of Fe‐based superconducting materials and the topological insulator Bi2Te3. Here, a top‐down approa...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2023-04-01
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| Series: | Advanced Electronic Materials |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/aelm.202200943 |
| _version_ | 1827893396500381696 |
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| author | Man Kit Cheng Cheuk Yin Ng Sui Lun Ho Omargeldi Atanov Wai Ting Tai Jing Liang Rolf Lortz Iam Keong Sou |
| author_facet | Man Kit Cheng Cheuk Yin Ng Sui Lun Ho Omargeldi Atanov Wai Ting Tai Jing Liang Rolf Lortz Iam Keong Sou |
| author_sort | Man Kit Cheng |
| collection | DOAJ |
| description | Abstract Bismuth telluride/iron telluride (Bi2Te3/Fe1+yTe) heterostructures are known to exhibit interfacial superconductivity between two non‐superconducting materials: Fe1+yTe as the parent compound of Fe‐based superconducting materials and the topological insulator Bi2Te3. Here, a top‐down approach is presented starting from 2D heterostructures to fabricate 1D Bi2Te3/Fe1+yTe nanowires or narrow nanoribbons. It is demonstrated that the Bi2Te3/Fe1+yTe heterostructure remains intact in nanostructures of widths on the order of 100 nm and the interfacial superconductivity is preserved, as evidenced by electrical transport and Andreev reflection point contact spectroscopy experiments measured at the end of the nanowire. The differential conductance shows a similar superconducting twin‐gap structure as in 2D heterostructures, but with enhanced fluctuation effects due to the lower dimensionality. A zero‐bias conductance peak indicates the presence of an Andreev bound state and, given the involvement of the topological Bi2Te3 surface state, a possible topological nature of superconductivity is discussed with strong interplay with an emerging ferromagnetism due to the interstitial excess iron (Fe) in the Fe1+yTe layer, developing in parallel with superconductivity at low temperatures. |
| first_indexed | 2024-03-12T21:53:29Z |
| format | Article |
| id | doaj.art-c2ea5091773a401f8f29652f937444d8 |
| institution | Directory Open Access Journal |
| issn | 2199-160X |
| language | English |
| last_indexed | 2024-03-12T21:53:29Z |
| publishDate | 2023-04-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Advanced Electronic Materials |
| spelling | doaj.art-c2ea5091773a401f8f29652f937444d82023-07-26T01:35:24ZengWiley-VCHAdvanced Electronic Materials2199-160X2023-04-0194n/an/a10.1002/aelm.202200943Interfacial Superconductivity and Zero Bias Peak in Quasi‐One‐Dimensional Bi2Te3/Fe1+yTe Heterostructure NanostructuresMan Kit Cheng0Cheuk Yin Ng1Sui Lun Ho2Omargeldi Atanov3Wai Ting Tai4Jing Liang5Rolf Lortz6Iam Keong Sou7Department of Physics The Hong Kong University of Science and Technology Clear Water Bay Hong Kong ChinaDepartment of Physics The Hong Kong University of Science and Technology Clear Water Bay Hong Kong ChinaDepartment of Physics The Hong Kong University of Science and Technology Clear Water Bay Hong Kong ChinaDepartment of Physics The Hong Kong University of Science and Technology Clear Water Bay Hong Kong ChinaDepartment of Physics The Hong Kong University of Science and Technology Clear Water Bay Hong Kong ChinaDepartment of Physics The Hong Kong University of Science and Technology Clear Water Bay Hong Kong ChinaDepartment of Physics The Hong Kong University of Science and Technology Clear Water Bay Hong Kong ChinaDepartment of Physics The Hong Kong University of Science and Technology Clear Water Bay Hong Kong ChinaAbstract Bismuth telluride/iron telluride (Bi2Te3/Fe1+yTe) heterostructures are known to exhibit interfacial superconductivity between two non‐superconducting materials: Fe1+yTe as the parent compound of Fe‐based superconducting materials and the topological insulator Bi2Te3. Here, a top‐down approach is presented starting from 2D heterostructures to fabricate 1D Bi2Te3/Fe1+yTe nanowires or narrow nanoribbons. It is demonstrated that the Bi2Te3/Fe1+yTe heterostructure remains intact in nanostructures of widths on the order of 100 nm and the interfacial superconductivity is preserved, as evidenced by electrical transport and Andreev reflection point contact spectroscopy experiments measured at the end of the nanowire. The differential conductance shows a similar superconducting twin‐gap structure as in 2D heterostructures, but with enhanced fluctuation effects due to the lower dimensionality. A zero‐bias conductance peak indicates the presence of an Andreev bound state and, given the involvement of the topological Bi2Te3 surface state, a possible topological nature of superconductivity is discussed with strong interplay with an emerging ferromagnetism due to the interstitial excess iron (Fe) in the Fe1+yTe layer, developing in parallel with superconductivity at low temperatures.https://doi.org/10.1002/aelm.202200943Andreev reflection point contact spectroscopyinterfacial superconductivityMajorana zero modesquasi‐one‐dimensional superconductivitytopological superconductivity |
| spellingShingle | Man Kit Cheng Cheuk Yin Ng Sui Lun Ho Omargeldi Atanov Wai Ting Tai Jing Liang Rolf Lortz Iam Keong Sou Interfacial Superconductivity and Zero Bias Peak in Quasi‐One‐Dimensional Bi2Te3/Fe1+yTe Heterostructure Nanostructures Advanced Electronic Materials Andreev reflection point contact spectroscopy interfacial superconductivity Majorana zero modes quasi‐one‐dimensional superconductivity topological superconductivity |
| title | Interfacial Superconductivity and Zero Bias Peak in Quasi‐One‐Dimensional Bi2Te3/Fe1+yTe Heterostructure Nanostructures |
| title_full | Interfacial Superconductivity and Zero Bias Peak in Quasi‐One‐Dimensional Bi2Te3/Fe1+yTe Heterostructure Nanostructures |
| title_fullStr | Interfacial Superconductivity and Zero Bias Peak in Quasi‐One‐Dimensional Bi2Te3/Fe1+yTe Heterostructure Nanostructures |
| title_full_unstemmed | Interfacial Superconductivity and Zero Bias Peak in Quasi‐One‐Dimensional Bi2Te3/Fe1+yTe Heterostructure Nanostructures |
| title_short | Interfacial Superconductivity and Zero Bias Peak in Quasi‐One‐Dimensional Bi2Te3/Fe1+yTe Heterostructure Nanostructures |
| title_sort | interfacial superconductivity and zero bias peak in quasi one dimensional bi2te3 fe1 yte heterostructure nanostructures |
| topic | Andreev reflection point contact spectroscopy interfacial superconductivity Majorana zero modes quasi‐one‐dimensional superconductivity topological superconductivity |
| url | https://doi.org/10.1002/aelm.202200943 |
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