Anisotropic Optical Conductivity of the N -Doped Type-Ii Three-Dimensional Dirac Semimetal PtTe2
PHYSICAL REVIEW B（2024）
Yunnan Univ
Abstract
We analyze theoretically the anisotropic optical conductivity of the n-doped type-II three-dimensional (3D) Dirac semimetal (DSM) PtTe2. With the effective Hamiltonian, which describes the anisotropic and tilted 3D Dirac cone in bulk PtTe2, the optical conductivities induced by the linearly polarized light are evaluated using the energy-balance equation derived from the Boltzmann equation. The in-plane optical conductivity crxx(w) is similar to that of isotropic and nontilted Dirac systems, whereas a unique out-of-plane optical conductivity crzz(w) has been found due to the tilt of the Dirac cone of PtTe2 along the kz direction. Both crxx(w) and crzz(w) are contributed by intraband and interband electronic transitions, where the interband transitions show more distinct anisotropic properties. We show that both crxx(w) and crzz(w) depend sensitively on energy relaxation times, temperature, and electron density, which enables their broad tunability in PtTe2, and promotes tailored applications of this and similar type-II 3D DSMs.
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