Residual quantum coherent electron transport in doped graphene leads
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866909406316199936 |
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| author | Delagrange, Raphaëlle Breton, Gaëlle Le Watanabe, Kenji Taniguchi, Takashi Roulleau, Preden Roche, Patrice Parmentier, François D |
| author_facet | Delagrange, Raphaëlle Breton, Gaëlle Le Watanabe, Kenji Taniguchi, Takashi Roulleau, Preden Roche, Patrice Parmentier, François D |
| contents | Recent low-temperature electron transport experiments in high-quality graphene rely on a technique of doped graphene leads, where the coupling between the graphene flake and its metallic contacts is increased by locally tuning graphene to high doping near the contacts. While this technique is widely used and has demonstrated its usefulness numerous times, little is known about the actual transport properties of the doped graphene leads. Here, we present an experiment probing those properties in the quantum Hall regime at low temperature and high magnetic field, showing that electronic phase coherence and transport chirality are preserved, despite the significant charge equilibration occurring at the edges of the leads. Our work yields a finer understanding of the properties of the doped graphene leads, allowing for improvements of the contact quality that can be applied to other two-dimensional materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_17264 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Residual quantum coherent electron transport in doped graphene leads Delagrange, Raphaëlle Breton, Gaëlle Le Watanabe, Kenji Taniguchi, Takashi Roulleau, Preden Roche, Patrice Parmentier, François D Mesoscale and Nanoscale Physics Recent low-temperature electron transport experiments in high-quality graphene rely on a technique of doped graphene leads, where the coupling between the graphene flake and its metallic contacts is increased by locally tuning graphene to high doping near the contacts. While this technique is widely used and has demonstrated its usefulness numerous times, little is known about the actual transport properties of the doped graphene leads. Here, we present an experiment probing those properties in the quantum Hall regime at low temperature and high magnetic field, showing that electronic phase coherence and transport chirality are preserved, despite the significant charge equilibration occurring at the edges of the leads. Our work yields a finer understanding of the properties of the doped graphene leads, allowing for improvements of the contact quality that can be applied to other two-dimensional materials. |
| title | Residual quantum coherent electron transport in doped graphene leads |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2408.17264 |