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Infared magneto-optical spectroscopy of boron nitride encapsulated graphene

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 GrapheneHBN-encapsulationHexagonal boron nitrideMagneto-opticsFTIRFaraday rotationMagnetic circular dichroimsSuperconducting magnetKramers-Kronig analysisLandau levels
URN: urn:nbn:ch:unige-1148995
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Projects FNS: 200020-140710
FNS: 200020-156615
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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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Deposited on : 2019-03-11

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