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2013/08/26

Press Release

Quantum Hall effect in multilayered massless Dirac fermion systems with tilted cones

A massless Dirac fermion system was realized in α-(BEDT-TTF)2I3 under high pressure. In contrast to graphene, this is the first bulk (multilayered) massless Dirac fermion material. Another important difference from graphene is that this system has highly tilted Dirac cones. In this case, conventional chiral symmetry is broken under a magnetic field. Here we experimentally addressed the question: Is the Landau level structure of the system with tilted Dirac cones the same as that of graphene (conventional two-dimensional (2D) Dirac fermion system) under a magnetic field? The answer is "YES". We succeeded in injecting holes into α-(BEDT-TTF)2I3 under high pressure for the first time.
The detection of Shubnikov-de Haas (SdH) oscillations whose phase was modified by Berry's phase π is direct evidence that this system is truly a 2D Dirac fermion system. In addition, we revealed the energy diagram of this device and characterized the multilayered quantum Hall effect (QHE).

Paper Reference:
Journal: Physical Review B

Title of the paper: Quantum Hall effect in multilayered massless Dirac fermion systems with tilted cones

Authors: Naoya Tajima, Takahiro Yamauchi, Tatsuya Yamaguchi, Masayuki Suda, Yoshitaka Kawasugi, Hiroshi M. Yamamoto, Reizo Kato, Yutaka Nishio and Koji Kajita

Date: Published online 27 August 2013 doi:10.1103/PhysRevB.88.075315

Hiroshi M. Yamamoto
Professor, Institute for Molecular Science
Home page: http://yamamoto-tokyo.jp/ims/english/

　　　　　　　

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