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2012 Fiscal Year Final Research Report

Thermal transport of Dirac fermions in multiband system

Research Project

  • PDF
Project/Area Number 23740257
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Condensed matter physics II
Research InstitutionThe University of Tokyo

Principal Investigator

KONOIKE Takako  東京大学, 物性研究所, 助教 (70447316)

Project Period (FY) 2011 – 2012
Keywords分子性固体・有機導体 / ディラック電子系 / 圧力 / 熱起電力測定
Research Abstract

The purpose of this work is to clarify the thermal transport of Dirac fermions in multiband system. The target material is the organic conductor θ-(BEDT-TTF)_2I_3, which has both Dirac-cone band and usual parabolic band under pressure. To begin with, we study the thermal transport of α-(BEDT-TTF)_2I_3 in which only Dirac-cone band exists.We have measured the thermopower and Nernst effect of α-(BEDT-TTF)_2I_3 under pressure. Because we obtained surprisingly interesting results in this system, we concentrated our research on this material. In the quantum limit region, the extremely large Nernst effect (>1mV/K) rather than the Seebeck effect was observed. This unusual behavior results from the intrinsic nature of the zero-mode (N=0) Landau level characteristic of the Dirac fermion system. The possible origin of the giant Nernst signal compared with that of graphene is the sharp width of the Landau level and the Zeeman gap in high-puritygα-(BEDT-TTF)_2I_3 crystal.

  • Research Products

    (11 results)

All 2013 2012 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (6 results) Book (3 results) Remarks (1 results)

  • [Journal Article] Anomalous Thermoelectric Transport and Giant Nernst Effect in Multilayered Massless DiracFermion System, J

    • Author(s)
      Takako Konoike, Mitsuyuki Sato, Kazuhito
    • Journal Title

      Phys. Soc. Jpn.

    • Peer Reviewed
  • [Presentation] 圧力下α-(BEDT-TTF)2I3のディラック電子系における熱起電力・ネルンスト効果2013

    • Author(s)
      鴻池貴子,佐藤光幸,内田和人,長田俊人
    • Organizer
      日本物理学会
    • Place of Presentation
      広島大学
    • Year and Date
      20130326-29
  • [Presentation] 有機導体を用いたディラック電子系の熱物性測定2013

    • Author(s)
      鴻池貴子
    • Organizer
      日本物理学会,JPSJフレンドシップミーティング
    • Place of Presentation
      広島大学
    • Year and Date
      2013-03-27
  • [Presentation] Thermopower and Nernt effect of Massless Dirac Fermion System α-(BEDT-TTF)2I3 Under Pressure2012

    • Author(s)
      T. Konoike, K. Uchida, M. Sato, T. Osada
    • Organizer
      International Symposium on Materials Science Openes by Molecular Degrees of Freedom (MDF2012)
    • Place of Presentation
      Miyazaki, Japan
    • Year and Date
      20121201-04
  • [Presentation] (BEDT-TTF)2I3の圧力・磁場下熱電効果測定2012

    • Author(s)
      鴻池貴子,内田和人,長田俊人
    • Organizer
      日本物理学会
    • Place of Presentation
      横浜国立大学
    • Year and Date
      20120918-21
  • [Presentation] Thermodynamic Properties of Massless Dirac Fermion System α-(BEDT-TTF)2I3 Under Pressure2012

    • Author(s)
      T. Konoike, K. Uchida, T. Osada
    • Organizer
      International Conference on Science and Technology of Synthetic Metals 2012 (ICSM2012)
    • Place of Presentation
      Atlanta, USA.
    • Year and Date
      20120708-13
  • [Presentation] α-(BEDT-TTF)2I3の圧力下熱測定2012

    • Author(s)
      鴻池貴子,内田和人,長田俊人
    • Organizer
      日本物理学会
    • Place of Presentation
      関西学院大学
    • Year and Date
      20120324-27
  • [Book] 角度依存シュタルク・サイク ロトロン共鳴とその応用2013

    • Author(s)
      鴻池貴子
    • Total Pages
      42-45
    • Publisher
      パリティ28
  • [Book] 強磁場下電気伝導に現れるサイクロトロ ン共鳴2013

    • Author(s)
      長田俊人,熊谷篤,内田和人,鴻池貴子
    • Total Pages
      65-73
    • Publisher
      固体物理48
  • [Book] α-(BEDT-TTF)2I3におけるディラック電子系の比熱とその磁場効果2012

    • Author(s)
      鴻池貴子,内田和人,長田俊人
    • Total Pages
      301-307
    • Publisher
      固体物理47
  • [Remarks]

    • URL

      http://osada.issp.u-tokyo.ac.jp/

URL: 

Published: 2014-09-25  

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