Unconventional Electromechanical Response in Ferrocene Assisted Gold Atomic Chain
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866918134340911104 |
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| author | Pabi, Biswajit Marek, Štěpán Klein, Tal Thakur, Arunabha Korytár, Richard Pal, Atindra Nath |
| author_facet | Pabi, Biswajit Marek, Štěpán Klein, Tal Thakur, Arunabha Korytár, Richard Pal, Atindra Nath |
| contents | Atomically thin metallic chains serve as pivotal systems for studying quantum transport, with their conductance strongly linked to the orbital picture. Here, we report a non-monotonic electro-mechanical response in a gold-ferrocene junction, characterized by an unexpected conductance increase over a factor of ten upon stretching. This response is detected in the formation of ferrocene-assisted atomic gold chain in a mechanically controllable break junction at a cryogenic temperature. DFT based calculations show that tilting of molecules inside the chain modifies the orbital overlap and the transmission spectra, leading to such non-monotonic conductance evolution with stretching. This behavior, unlike typical flat conductance plateaus observed in metal atomic chains, pinpoints the unique role of conformational rearrangements during chain elongation. Our findings provide a deeper understanding of the role of orbital hybridization in transport properties and offer new opportunities for designing nanoscale devices with tailored electro-mechanical characteristics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_02264 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Unconventional Electromechanical Response in Ferrocene Assisted Gold Atomic Chain Pabi, Biswajit Marek, Štěpán Klein, Tal Thakur, Arunabha Korytár, Richard Pal, Atindra Nath Mesoscale and Nanoscale Physics Atomically thin metallic chains serve as pivotal systems for studying quantum transport, with their conductance strongly linked to the orbital picture. Here, we report a non-monotonic electro-mechanical response in a gold-ferrocene junction, characterized by an unexpected conductance increase over a factor of ten upon stretching. This response is detected in the formation of ferrocene-assisted atomic gold chain in a mechanically controllable break junction at a cryogenic temperature. DFT based calculations show that tilting of molecules inside the chain modifies the orbital overlap and the transmission spectra, leading to such non-monotonic conductance evolution with stretching. This behavior, unlike typical flat conductance plateaus observed in metal atomic chains, pinpoints the unique role of conformational rearrangements during chain elongation. Our findings provide a deeper understanding of the role of orbital hybridization in transport properties and offer new opportunities for designing nanoscale devices with tailored electro-mechanical characteristics. |
| title | Unconventional Electromechanical Response in Ferrocene Assisted Gold Atomic Chain |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2509.02264 |