Search for massive Dirac state by NMR and transport measurements

2015 Fiscal Year Final Research Report

• Project/Area Number: 24654101
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: Miyagawa Kazuya 東京大学, 工学(系)研究科(研究院), 助教 (90302760)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: ディラック電子系 / 有機導体 / 核磁気共鳴 / 輸送現象測定

Outline of Final Research Achievements

Due to linear dispersion in band structure, a mass of carrier in Dirac Fermion state is expected to be zero. However, theoretical studies predict carrier get mass in some special cases. We investigate the electronic state of organic bulk masless Dirac Fermion system, a,q-(BEDT-TTF)2I3 by transport and NMR measurements.
We found the different temperature dependence between lower pressure and higher pressure Dirac states in transport and NMR properties of a-(BEDT-TTF)2I3.
We obtained the new information of Dirac state where it is believed that there is no pressure dependence of character of carrier.

Free Research Field

物性物理