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Nodal line in single-component molecular conductor [Pd(dddt)_2] has beenexamined to understand the tilted Dirac cone on the non-coplanar loop. In theprevious work [J. Phys. Soc. Jpn. 87, 113701 (2018)], the velocity of the conewas calculated at respective Dirac points on the nodal loop based on ourfirst-principles band structure calculations, which was a new method to derivean effective Hamiltonian with a 2 x 2 matrix. However, the Dirac cones on thenodal line are fully reproduced only at symmetric points. In the present paper,we show that our improved method well reproduces reasonable behaviors of allthe Dirac cones and a very small energy dispersion of 6~meV among the Diracpoints. The variation of velocities along the nodal line are shown by usingprincipal axes of the gap function between the conduction and valence bands.Further, the density of states close to the chemical potential and orbitalmagnetic susceptibility are calculated using such an effective Hamiltonian.

Role of Velocity Field and Principal Axis of Tilted Dirac Cones in Effective Hamlitonan of Non-Coplanar Nodal Loop