Implementing Josephson Junction spectroscopy in a scanning tunneling microscope
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arXiv
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| Format: | Preprint |
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2024
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| author | Fortman, Margaret A. Harrison, David C. Rodriguez, Ramiro H. Krebs, Zachary J. Han, Sangjun Jang, Min Seok McDermott, Robert Girit, Caglar O. Brar, Victor W. |
| author_facet | Fortman, Margaret A. Harrison, David C. Rodriguez, Ramiro H. Krebs, Zachary J. Han, Sangjun Jang, Min Seok McDermott, Robert Girit, Caglar O. Brar, Victor W. |
| contents | Josephson junction spectroscopy is a powerful local microwave spectroscopy technique that has promising potential as a diagnostic tool to probe the microscopic origins of noise in superconducting qubits. We present advancements toward realizing Josephson junction spectroscopy in a scanning geometry, where the Josephson junction is formed between a superconducting sample and a high capacitance superconducting STM tip. Data from planar Nb-based Josephson junction devices first demonstrate the benefits of including a high capacitance shunt across the junction, which decreases linewidth and improves performance at elevated temperatures. We show how an equivalent circuit can be implemented by utilizing a planarized STM tip with local prominences, which are fabricated via electron beam lithography and reactive ion etching, followed by coating with a superconducting layer. Differential conductance measurements on a superconducting NbN surface demonstrate the ability of these high capacitance tips to decrease both thermal noise and P(E)-broadening in comparison to typical wire tips. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_03009 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Implementing Josephson Junction spectroscopy in a scanning tunneling microscope Fortman, Margaret A. Harrison, David C. Rodriguez, Ramiro H. Krebs, Zachary J. Han, Sangjun Jang, Min Seok McDermott, Robert Girit, Caglar O. Brar, Victor W. Superconductivity Mesoscale and Nanoscale Physics Josephson junction spectroscopy is a powerful local microwave spectroscopy technique that has promising potential as a diagnostic tool to probe the microscopic origins of noise in superconducting qubits. We present advancements toward realizing Josephson junction spectroscopy in a scanning geometry, where the Josephson junction is formed between a superconducting sample and a high capacitance superconducting STM tip. Data from planar Nb-based Josephson junction devices first demonstrate the benefits of including a high capacitance shunt across the junction, which decreases linewidth and improves performance at elevated temperatures. We show how an equivalent circuit can be implemented by utilizing a planarized STM tip with local prominences, which are fabricated via electron beam lithography and reactive ion etching, followed by coating with a superconducting layer. Differential conductance measurements on a superconducting NbN surface demonstrate the ability of these high capacitance tips to decrease both thermal noise and P(E)-broadening in comparison to typical wire tips. |
| title | Implementing Josephson Junction spectroscopy in a scanning tunneling microscope |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2410.03009 |