Modulation of sub-optical cycle photocurrents in an ultrafast near-infrared scanning tunnelling microscope
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866918101603319808 |
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| author | Rossetti, Andrea Pagnini, Florian Assaid, Majdi Schoenfeld, Christoph Leitenstorfer, Alfred Ludwig, Markus Brida, Daniele |
| author_facet | Rossetti, Andrea Pagnini, Florian Assaid, Majdi Schoenfeld, Christoph Leitenstorfer, Alfred Ludwig, Markus Brida, Daniele |
| contents | Lightwave-driven scanning tunnelling microscopy (STM) at near-IR frequencies promises an unprecedented combination of atomic spatial resolution and temporal resolution approaching the attosecond range. To achieve this goal, high-sensitivity optical control and detection of sub-cycle tunnelling currents must be achieved at the STM junction. Here, we demonstrate the generation and detection of coherent ultrafast currents across the junction of an STM illuminated by near-infrared single-cycle pulses. We introduce a novel modulation scheme that avoids time-dependent thermal loading while selectively isolating carrier-envelope phase (CEP)-dependent photocurrents. All artifacts arising from periodic modulation of laser power and thermal coupling are efficiently suppressed, enabling a clean readout of the coherent portion of the ultrafast tunneling current. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_16357 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Modulation of sub-optical cycle photocurrents in an ultrafast near-infrared scanning tunnelling microscope Rossetti, Andrea Pagnini, Florian Assaid, Majdi Schoenfeld, Christoph Leitenstorfer, Alfred Ludwig, Markus Brida, Daniele Optics Applied Physics Lightwave-driven scanning tunnelling microscopy (STM) at near-IR frequencies promises an unprecedented combination of atomic spatial resolution and temporal resolution approaching the attosecond range. To achieve this goal, high-sensitivity optical control and detection of sub-cycle tunnelling currents must be achieved at the STM junction. Here, we demonstrate the generation and detection of coherent ultrafast currents across the junction of an STM illuminated by near-infrared single-cycle pulses. We introduce a novel modulation scheme that avoids time-dependent thermal loading while selectively isolating carrier-envelope phase (CEP)-dependent photocurrents. All artifacts arising from periodic modulation of laser power and thermal coupling are efficiently suppressed, enabling a clean readout of the coherent portion of the ultrafast tunneling current. |
| title | Modulation of sub-optical cycle photocurrents in an ultrafast near-infrared scanning tunnelling microscope |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2507.16357 |