Theory of atomic-scale direct thermometry using ESR-STM
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866909342040588288 |
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| author | del Castillo, Y. Fernández-Rossier, J. |
| author_facet | del Castillo, Y. Fernández-Rossier, J. |
| contents | Knowledge of the occupation ratio and the energy splitting of a two-level system yields a direct readout of its temperature. Based on this principle, the determination of the temperature of an individual two-level magnetic atom was demonstrated using Electron Spin Resonance (ESR) via Scanning Tunneling Microscopy (ESR-STM). The temperature determination proceeds in two steps. First, energy splitting is determined using ESR-STM. Second, the equilibrium occupation of the two-level atom is determined in a resonance experiment of a second nearby atom, that has now two different resonant peaks, associated to the two states of the magnetic two-level atom. The ratio of the heights of its resonance peaks yields the occupation ratio. Here we present theory work to address three key aspects: first, we find how shot-noise and back-action limit the precision of this thermometry method; second, we study how the geometry of the nearby spins can be used to enhance signal-to-noise ratio. We predict ESR-STM thermometry can achieve a resolution of 10 mK using temperatures in the T= 1K range. Third, we show how ESR-STM thermometry can be used to detect thermal gradients as small as 5 mK/nm. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_02404 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Theory of atomic-scale direct thermometry using ESR-STM del Castillo, Y. Fernández-Rossier, J. Mesoscale and Nanoscale Physics Knowledge of the occupation ratio and the energy splitting of a two-level system yields a direct readout of its temperature. Based on this principle, the determination of the temperature of an individual two-level magnetic atom was demonstrated using Electron Spin Resonance (ESR) via Scanning Tunneling Microscopy (ESR-STM). The temperature determination proceeds in two steps. First, energy splitting is determined using ESR-STM. Second, the equilibrium occupation of the two-level atom is determined in a resonance experiment of a second nearby atom, that has now two different resonant peaks, associated to the two states of the magnetic two-level atom. The ratio of the heights of its resonance peaks yields the occupation ratio. Here we present theory work to address three key aspects: first, we find how shot-noise and back-action limit the precision of this thermometry method; second, we study how the geometry of the nearby spins can be used to enhance signal-to-noise ratio. We predict ESR-STM thermometry can achieve a resolution of 10 mK using temperatures in the T= 1K range. Third, we show how ESR-STM thermometry can be used to detect thermal gradients as small as 5 mK/nm. |
| title | Theory of atomic-scale direct thermometry using ESR-STM |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2410.02404 |