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Doctoral Thesis
unige:114899 
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Infared magneto-optical spectroscopy of boron nitride encapsulated graphene |
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| Defense | Thèse de doctorat : Univ. Genève, 2018 - Sc. 5274 - 2018/10/09 | |
| Abstract | The goal of this work is measuring magneto-optical spectra of high quality graphene crystals in the terahertz and infrared regions in order to understand magneto-optical phenomena in graphene unperturbed by defects, impurities, inhomogeneities of chemical potential, etc. For this purpose we used scotch-tape exfoliated hBN-encapsulated graphene membranes suspended over circular apertures of a few dozens of microns in diameter. In order to enable measurements on such small samples, we developed a compact superconducting magnet compatible with commercial FTIR spectrometers and infrared microscopes. Our experiments revealed large magnitudes of the magneto-optical effects: magneto-absorption of circularly polarized light approaching the 50% limit valid for ultrathin conducting films, full magnetic circular dichroism, Faraday rotation angle up to 9°, as well as efficient tunability of these effects with the help of the external magnetic field. Apart form that, we also registered a number of subtle puzzling effects incompatible with a simple single-electron theory. | |
| Keywords | Graphene — HBN-encapsulation — Hexagonal boron nitride — Magneto-optics — FTIR — Faraday rotation — Magnetic circular dichroims — Superconducting magnet — Kramers-Kronig analysis — Landau levels | |
| Identifiers | URN: urn:nbn:ch:unige-1148995 | |
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| Projects | FNS: 200020-140710 FNS: 200020-156615 | |
| Citation (ISO format) | NEDOLIUK, Ievgeniia. Infared magneto-optical spectroscopy of boron nitride encapsulated graphene. Université de Genève. Thèse, 2018. doi: 10.13097/archive-ouverte/unige:114899 https://archive-ouverte.unige.ch/unige:114899 |
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