Development of a Nb-based semiconductor-superconductor hybrid platform
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866908578461253632 |
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| author | Telkamp, Sjoerd Antonelli, Tommaso Todt, Clemens Hinderling, Manuel Coraiola, Marco Haxell, Daniel Kate, Sofieke C. ten Sabonis, Deividas Zeng, Peng Schott, Rüdiger Cheah, Erik Reichl, Christian Nichele, Fabrizio Krizek, Filip Wegscheider, Werner |
| author_facet | Telkamp, Sjoerd Antonelli, Tommaso Todt, Clemens Hinderling, Manuel Coraiola, Marco Haxell, Daniel Kate, Sofieke C. ten Sabonis, Deividas Zeng, Peng Schott, Rüdiger Cheah, Erik Reichl, Christian Nichele, Fabrizio Krizek, Filip Wegscheider, Werner |
| contents | Semiconductor-superconductor hybrid materials are used as a platform to realise Andreev bound states, which hold great promise for quantum applications. These states require transparent interfaces between the semiconductor and superconductor, which are typically realised by in-situ deposition of an Al superconducting layer. Here we present a hybrid material based on an InAs two-dimensional electron gas (2DEG) combined with in-situ deposited Nb and NbTi superconductors, which offer a larger operating range in temperature and magnetic field due to their larger superconducting gap. We overcome the inherent difficulty associated with the formation of an amorphous interface between III-V semiconductors and Nb-based superconductors by introducing a 7 nm Al interlayer. The Al interlayer provides an epitaxial connection between an in-situ magnetron sputtered Nb or NbTi thin film and a shallow InAs 2DEG. This metal-to-metal epitaxy is achieved by optimization of the material stack and results in an induced superconducting gap of approximately 1 meV, determined from transport measurements of superconductor-semiconductor Josephson junctions. This induced gap is approximately five times larger than the values reported for Al-based hybrid materials and indicates the formation of highly-transparent interfaces that are required in high-quality hybrid material platforms. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_10719 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Development of a Nb-based semiconductor-superconductor hybrid platform Telkamp, Sjoerd Antonelli, Tommaso Todt, Clemens Hinderling, Manuel Coraiola, Marco Haxell, Daniel Kate, Sofieke C. ten Sabonis, Deividas Zeng, Peng Schott, Rüdiger Cheah, Erik Reichl, Christian Nichele, Fabrizio Krizek, Filip Wegscheider, Werner Superconductivity Mesoscale and Nanoscale Physics Semiconductor-superconductor hybrid materials are used as a platform to realise Andreev bound states, which hold great promise for quantum applications. These states require transparent interfaces between the semiconductor and superconductor, which are typically realised by in-situ deposition of an Al superconducting layer. Here we present a hybrid material based on an InAs two-dimensional electron gas (2DEG) combined with in-situ deposited Nb and NbTi superconductors, which offer a larger operating range in temperature and magnetic field due to their larger superconducting gap. We overcome the inherent difficulty associated with the formation of an amorphous interface between III-V semiconductors and Nb-based superconductors by introducing a 7 nm Al interlayer. The Al interlayer provides an epitaxial connection between an in-situ magnetron sputtered Nb or NbTi thin film and a shallow InAs 2DEG. This metal-to-metal epitaxy is achieved by optimization of the material stack and results in an induced superconducting gap of approximately 1 meV, determined from transport measurements of superconductor-semiconductor Josephson junctions. This induced gap is approximately five times larger than the values reported for Al-based hybrid materials and indicates the formation of highly-transparent interfaces that are required in high-quality hybrid material platforms. |
| title | Development of a Nb-based semiconductor-superconductor hybrid platform |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2408.10719 |