Modification of the scattering mechanisms in bilayer graphene in proximity to a molecular thin film probed in the mesoscopic regime
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Mansour, Anise Diaz, Deanna Dissanayake, Movindu Kawshan Henkhaus, Erin Cho, Jungyoun Tran, Vinh Ramirez, Francisco Corona-Oceguera, Eric Luna, Joshua Kodama, Kenta Chen, Yueyun Chan, Ho Weber, Jacob Koford, Blake Barfield, Patrick Martinez, Maya Watanabe, Kenji Taniguchi, Takashi Regan, B. C. Mecklenburg, Matthew Gredig, Thomas Ojeda-Aristizabal, Claudia |
| author_facet | Mansour, Anise Diaz, Deanna Dissanayake, Movindu Kawshan Henkhaus, Erin Cho, Jungyoun Tran, Vinh Ramirez, Francisco Corona-Oceguera, Eric Luna, Joshua Kodama, Kenta Chen, Yueyun Chan, Ho Weber, Jacob Koford, Blake Barfield, Patrick Martinez, Maya Watanabe, Kenji Taniguchi, Takashi Regan, B. C. Mecklenburg, Matthew Gredig, Thomas Ojeda-Aristizabal, Claudia |
| contents | Quantum coherent effects can be probed in multilayer graphene through electronic transport measurements at low temperatures. In particular, bilayer graphene is known to be susceptible to quantum interference corrections of the conductivity, presenting weak localization at all electronic densities, and dependent on different scattering mechanisms as well as on the trigonal warping of the electron dispersion near the K and K' valleys. Proximity effects with a molecular thin film influence these scattering mechanisms, which can be quantified through the known theory of magnetoconductance for bilayer graphene. Here, we present weak localization measurements in a copper-phthalocyanine / bilayer graphene / h-BN heterostructure that suggest an important suppression of trigonal warping effects in bilayer graphene (BLG), restoring the manifestation of the chirality of the charge carriers in the localization properties of BLG. Additionally, we observe a charge transfer of 3.6$\times$10$^{12}$cm$^{-2}$ from the BLG to the molecules, as well as a very small degradation of the mobility of the BLG/h-BN heterostructure upon the deposition of copper phthalocyanine (CuPc). The molecular arrangement of the CuPc thin film is characterized in a control sample through transmission electron microscopy, that we relate to the electronic transport results. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_20990 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Modification of the scattering mechanisms in bilayer graphene in proximity to a molecular thin film probed in the mesoscopic regime Mansour, Anise Diaz, Deanna Dissanayake, Movindu Kawshan Henkhaus, Erin Cho, Jungyoun Tran, Vinh Ramirez, Francisco Corona-Oceguera, Eric Luna, Joshua Kodama, Kenta Chen, Yueyun Chan, Ho Weber, Jacob Koford, Blake Barfield, Patrick Martinez, Maya Watanabe, Kenji Taniguchi, Takashi Regan, B. C. Mecklenburg, Matthew Gredig, Thomas Ojeda-Aristizabal, Claudia Mesoscale and Nanoscale Physics Quantum coherent effects can be probed in multilayer graphene through electronic transport measurements at low temperatures. In particular, bilayer graphene is known to be susceptible to quantum interference corrections of the conductivity, presenting weak localization at all electronic densities, and dependent on different scattering mechanisms as well as on the trigonal warping of the electron dispersion near the K and K' valleys. Proximity effects with a molecular thin film influence these scattering mechanisms, which can be quantified through the known theory of magnetoconductance for bilayer graphene. Here, we present weak localization measurements in a copper-phthalocyanine / bilayer graphene / h-BN heterostructure that suggest an important suppression of trigonal warping effects in bilayer graphene (BLG), restoring the manifestation of the chirality of the charge carriers in the localization properties of BLG. Additionally, we observe a charge transfer of 3.6$\times$10$^{12}$cm$^{-2}$ from the BLG to the molecules, as well as a very small degradation of the mobility of the BLG/h-BN heterostructure upon the deposition of copper phthalocyanine (CuPc). The molecular arrangement of the CuPc thin film is characterized in a control sample through transmission electron microscopy, that we relate to the electronic transport results. |
| title | Modification of the scattering mechanisms in bilayer graphene in proximity to a molecular thin film probed in the mesoscopic regime |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2504.20990 |