Volume 119, Number 6, September 2017
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||29 November 2017|
Aperiodic quantum oscillations of particle-hole asymmetric Dirac cones
1 Laboratoire de Physique des Solides, CNRS UMR 8502 - Université Paris-Sud - 91405 Orsay Cedex, France
2 Laboratoire de Physique Théorique de la Matière Condensée, CNRS UMR 7600 - Université Pierre et Marie Curie 4 Place Jussieu, 75252 Paris Cedex 05, France
3 MOLTECH-Anjou, CNRS UMR 6200 - Université d'Angers - Bâtiment K, 49045 Angers Cedex, France
4 RIKEN - Hirosawa 2-1, Wako, Saitama 351-0198, Japan
5 Institute for Molecular Science - Okazaki, Aichi 444-8585, Japan
6 Department of Physics, Toho University - Miyama 2-2-1, Funabashi, Chiba 274-8510, Japan
Received: 31 October 2017
Accepted: 7 November 2017
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.
PACS: 75.47.-m – Magnetotransport phenomena; materials for magnetotransport / 73.43.Qt – Magnetoresistance / 72.80.Le – Polymers; organic compounds (including organic semiconductors)
© EPLA, 2017
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