Anisotropic Conductivity of Nodal Line Semimetal in Single-Component Molecular Conductor [Pd(dddt)${}_2$]

Abstract

Using a tight-binding model, we theoretically examine the anisotropic conductivity of the nodal line semimetal of a three-dimensional Dirac electron in a single-component molecular conductor [Pd(dddt)${}_2$], which consists of four molecules with HOMO and LUMO orbitals per unit cell. The conductivity shows an anisotropy given by ${\sigma }_y>{\sigma }_x>{\sigma }_z$ in accordance with that of the velocity of the Dirac cone where $z$ is the interlayer direction and $y$ is the molecular stacking direction. With increasing pressure, the nodal line semimetal emerges, followed by a loop of the Dirac point where ${\sigma }_x$ takes its maximum at a pressure. Such a pressure dependence is studied by calculating the density of states and chemical potential. The temperature dependence of anisotropic conductivity is examined at low temperatures to obtain a constant behavior, which is ascribed to the Dirac electron. The relevance of the present calculation to the experiment is discussed.

7 pages, 8 figures

References in corpus (1)

• Phase transition between the quantum spin Hall and insulator phases in 3D: emergence of a topological gapless phase

Cited by in corpus (8)

• Effective Hamiltonian of Topological Nodal Line Semimetal in Single-Component Molecular Conductor [Pd(dddt)${}_2$] from First-Principles
• Conductivity and Resistivity of Dirac Electrons in Single-Component Molecular Conductor [Pd(dddt)_2]
• Berry Phase of Dirac Nodal Line Semimetal in Single-Component Molecular Conductor
• Role of Velocity Field and Principal Axis of Tilted Dirac Cones in Effective Hamlitonan of Non-Coplanar Nodal Loop
• Tight-Binding Model and Electronic Property of Dirac Nodal Line in Single-Component Molecular Conductor [Pt(dmdt)${}_2$]
• Electric Transport of Nodal Line Semimetal in Single-Component Molecular Conductor
• Possible Spin-Density Wave on Fermi Arc of Edge State in Single-Component Molecular Conductors [Pt(dmdt)${}_2$] and [Ni(dmdt)${}_2$]
• Fragment-orbital-dependent spin fluctuations in the single-component molecular conductor [Ni(dmdt)${}_2$]