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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2602.24157 |
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| _version_ | 1866914357967847424 |
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| author | Lu, Weikang Xu, Ziyi Zhang, Hewan Biehs, Svend Age Kittel, Achim Qin, Ludi Gong, Xue Xue, Huanyi Song, Yanru Zhong, Zhengyang Chen, Shiyou Ding, Kun Lu, Wei An, Zhenghua |
| author_facet | Lu, Weikang Xu, Ziyi Zhang, Hewan Biehs, Svend Age Kittel, Achim Qin, Ludi Gong, Xue Xue, Huanyi Song, Yanru Zhong, Zhengyang Chen, Shiyou Ding, Kun Lu, Wei An, Zhenghua |
| contents | The thermal Casimir effect, arising from fluctuating electromagnetic fields of thermally agitated charges, induces thermosensitive forces and presents a novel approach to detecting nanoscale hot electrons, elusive yet ubiquitous in modern miniaturized transistors. However, detecting thermal Casimir forces at the nanoscale remains extremely challenging due to background forces such as electrostatic force and quantum Casimir force. In this study, we present the first non-contact force measurement of hot electrons based on the thermal Casimir effect. Using an atomic force microscope (AFM) with a dual-resonant tip, we achieve thermosensitive force detection of nonequilibrium hot electrons while effectively suppressing background thermo-insensitive forces, thereby distinguishing them from cold electrons. In silicon nanoconstriction devices, the measured thermal Casimir pressure reaches approximately 3 bar at a separation of 5 nm at an electron temperature of about 10^3 K. Our work introduces a novel methodology for hot electron nanothermometry and provides critical insights into the thermo-mechanical properties of post-Moore nanoelectronics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_24157 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Thermal Casimir Force Imaging of Nonequilibrium Hot Electrons Lu, Weikang Xu, Ziyi Zhang, Hewan Biehs, Svend Age Kittel, Achim Qin, Ludi Gong, Xue Xue, Huanyi Song, Yanru Zhong, Zhengyang Chen, Shiyou Ding, Kun Lu, Wei An, Zhenghua Mesoscale and Nanoscale Physics The thermal Casimir effect, arising from fluctuating electromagnetic fields of thermally agitated charges, induces thermosensitive forces and presents a novel approach to detecting nanoscale hot electrons, elusive yet ubiquitous in modern miniaturized transistors. However, detecting thermal Casimir forces at the nanoscale remains extremely challenging due to background forces such as electrostatic force and quantum Casimir force. In this study, we present the first non-contact force measurement of hot electrons based on the thermal Casimir effect. Using an atomic force microscope (AFM) with a dual-resonant tip, we achieve thermosensitive force detection of nonequilibrium hot electrons while effectively suppressing background thermo-insensitive forces, thereby distinguishing them from cold electrons. In silicon nanoconstriction devices, the measured thermal Casimir pressure reaches approximately 3 bar at a separation of 5 nm at an electron temperature of about 10^3 K. Our work introduces a novel methodology for hot electron nanothermometry and provides critical insights into the thermo-mechanical properties of post-Moore nanoelectronics. |
| title | Thermal Casimir Force Imaging of Nonequilibrium Hot Electrons |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2602.24157 |