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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2603.05030 |
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| _version_ | 1866908868210065408 |
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| author | Bylinkin, Andrei Roelli, Philippe Shetty, Naveen Yakimova, Rositsa Starke, Ulrich Coletti, Camilla Forti, Stiven Zakharov, Alexei Silkin, Vyacheslav M. Lara-Avila, Samuel Hillenbrand, Rainer |
| author_facet | Bylinkin, Andrei Roelli, Philippe Shetty, Naveen Yakimova, Rositsa Starke, Ulrich Coletti, Camilla Forti, Stiven Zakharov, Alexei Silkin, Vyacheslav M. Lara-Avila, Samuel Hillenbrand, Rainer |
| contents | Atomically thin materials exhibit electronic and optical properties distinct from their three-dimensional counterparts. For metals, particularly gold, monolayer studies remain largely unexplored due to fabrication and characterisation challenges. Here we report the first optical study of a stable quasi-freestanding gold monolayer formed by Au intercalation between graphene and SiC. Mid-infrared nanoimaging reveals plasmon-polaritons with wavelengths nearly an order of magnitude shorter than free-space light. Analysis of their dispersion using a Drude model yields a relaxation time of $τ= 18\,$fs, comparable to bulk gold, and a Drude weight of $D = 1.3\,$mS$\cdot$eV, nearly twice the bulk expectation. These results establish monolayer gold as a two-dimensional metal, opening opportunities for nanoscale photonics, plasmonics and ultra-thin electronics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_05030 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Real-Space Plasmon Imaging Reveals Modified Electronic Structure of Gold at the Monolayer Limit Bylinkin, Andrei Roelli, Philippe Shetty, Naveen Yakimova, Rositsa Starke, Ulrich Coletti, Camilla Forti, Stiven Zakharov, Alexei Silkin, Vyacheslav M. Lara-Avila, Samuel Hillenbrand, Rainer Optics Materials Science Atomically thin materials exhibit electronic and optical properties distinct from their three-dimensional counterparts. For metals, particularly gold, monolayer studies remain largely unexplored due to fabrication and characterisation challenges. Here we report the first optical study of a stable quasi-freestanding gold monolayer formed by Au intercalation between graphene and SiC. Mid-infrared nanoimaging reveals plasmon-polaritons with wavelengths nearly an order of magnitude shorter than free-space light. Analysis of their dispersion using a Drude model yields a relaxation time of $τ= 18\,$fs, comparable to bulk gold, and a Drude weight of $D = 1.3\,$mS$\cdot$eV, nearly twice the bulk expectation. These results establish monolayer gold as a two-dimensional metal, opening opportunities for nanoscale photonics, plasmonics and ultra-thin electronics. |
| title | Real-Space Plasmon Imaging Reveals Modified Electronic Structure of Gold at the Monolayer Limit |
| topic | Optics Materials Science |
| url | https://arxiv.org/abs/2603.05030 |