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Spin and valley splittings in multilayered massless Dirac fermion system

Naoya Tajima, Mitsuyuki Sato, Shigeharu Sugawara, Reizo Kato, Yutaka Nishio, and Koji Kajita
Phys. Rev. B 82, 121420(R) – Published 28 September 2010

Abstract

The interlayer magnetoresistance in a multilayered massless Dirac fermion system, α(BEDT-TTF)2I3, under hydrostatic pressure was investigated. We succeeded in detecting the zero-mode (n=0) Landau level and its spin splitting in the magnetic field normal to the two-dimensional plane. We demonstrated that the effective Coulomb interaction in the magnetic field intensifies the spin splitting of zero-mode Landau carriers. At temperatures below 2 K, magnetic fields above several Tesla break the twofold valley degeneracy.

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  • Received 20 July 2010

DOI:https://doi.org/10.1103/PhysRevB.82.121420

©2010 American Physical Society

Authors & Affiliations

Naoya Tajima1, Mitsuyuki Sato2, Shigeharu Sugawara3, Reizo Kato1, Yutaka Nishio2, and Koji Kajita2

  • 1RIKEN, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan
  • 2Department of Physics, Toho University, Miyama 2-2-1, Funabashi-shi, Chiba 274-8510, Japan
  • 3Department of Physics, Faculty of Science and Technology, Tokyo University of Science, Yamazaki 2641, Noda, Chiba 278-8510, Japan

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Issue

Vol. 82, Iss. 12 — 15 September 2010

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