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Aperiodic quantum oscillations of particle-hole asymmetric Dirac cones
Abstract : We report experimental measurements and theoretical analysis of Shubnikov-de Haas (SdH) oscillations in a Dirac cone system: the α-(BEDT-TTF)2I3 organic metal under hydrostatic pressure. The measured SdH oscillations reveal anomalies at high magnetic fields B where the 1/B oscillations periodicity is lost above 7 T. We interpret these unusual results within a theoretical model that takes into account intrinsic distortions of the α-(BEDT-TTF)2I3 Dirac cones such as a parabolic particle-hole asymmetric correction. Others possible causes, such as a cone tilting or a Zeeman effect, are carefully ruled out. The observations are consistent among α-(BEDT-TTF)2I3 samples with different Fermi levels.
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https://hal.univ-angers.fr/hal-02564492
Contributeur : Okina Univ Angers Connectez-vous pour contacter le contributeur
Soumis le : mardi 5 mai 2020 - 21:24:32
Dernière modification le : vendredi 7 janvier 2022 - 03:50:11
Contributeur : Okina Univ Angers Connectez-vous pour contacter le contributeur
Soumis le : mardi 5 mai 2020 - 21:24:32
Dernière modification le : vendredi 7 janvier 2022 - 03:50:11
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