Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session L10: Strong Interactions in Topological Semimetals
11:15 AM–2:03 PM,
Wednesday, March 7, 2018
LACC Room: 301B
Sponsoring Unit: DMP
Chair: Vidya Madhavan, University of Illinois at Urbana-Champaign
Abstract: L10.00008 : Organic diamond lattice Mott insulator: three dimensional Dirac semimetal candidate*
1:03 PM–1:15 PM
A half-filled Diamond lattice is a promising candidate of three-dimensional (3D) topological Dirac semimetal. We report the model material in a molecular compound (ET)Ag4(CN)5 with a S=1/2 diamond lattice. The DFT calculation shows Dirac nodal lines with the vanishing density of states at the Fermi energy. Owing to the strong electron correlations, the system exhibits a Mott insulating ground state with antiferromagnet order below 102 K. The weak ferromagnetism indicate the significant spin-orbit coupling and inversioin symmetry breaking, which can lift the degeneracy of the nodal line. We report the possible Mott transition into 3D Dirac semimetal under high pressures.
*This work was supported by JSPS KAKENHI Grant Number JP16K13836, JP17H05151, and JP16H04012, 16H04139, and JP26288035.
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