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arXiv · 1711.00039

Aperiodic quantum oscillations of particle-hole asymmetric Dirac cones

E. Tisserond·J. N. Fuchs·M. O. Goerbig·P. Auban-Senzier·C. Meziere·P. Batail·Y. Kawasugi·M. Suda·H. M. Yamamoto·R. Kato·N. Tajima·M. Monteverde
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Abstract

We report experimental measurements and theoretical analysis of Shubnikov-de Haas (SdH) oscillations in a Dirac cone system: the a-(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 a-(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 a-(BEDT-TTF)2I3 samples with different Fermi levels.

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E. Tisserond, J. N. Fuchs, M. O. Goerbig, P. Auban-Senzier, C. Meziere, P. Batail, Y. Kawasugi, M. Suda, H. M. Yamamoto, R. Kato, N. Tajima, M. Monteverde. 2017-10-31. Aperiodic quantum oscillations of particle-hole asymmetric Dirac cones. https://doi.org/10.1209/0295-5075%2F119%2F67001

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