Many-body exchange-correlation effects in MoS$_2$ monolayer: The key role of nonlocal dielectric screening

TL;DR

This study investigates the quasiparticle properties of MoS₂ monolayer considering many-body exchange-correlation effects and nonlocal dielectric screening, revealing how these factors influence Fermi velocity and spectral features.

Contribution

It introduces a comprehensive calculation of quasiparticle properties in MoS₂ monolayer incorporating dynamical electron-electron interactions and nonlocal dielectric screening effects.

Findings

Nonlocal dielectric screening stabilizes the Fermi liquid in MoS₂.

Effective Fermi velocity behaves differently when solved self-consistently versus on-shell.

Interaction strength depends on multiple variables including screening length and carrier density.

Abstract

We calculate the quasiparticle properties of $\rm{MoS_2}$ monolayer at $T=0$ considering the dynamical electron-electron interaction effect within random-phase-approximation (RPA). The calculations are carried out for an electron-doped slab of $\rm{MoS_2}$ monolayer using a minimal massive Dirac Hamiltonian and the quasi-two-dimensional nature of the Coulomb interaction in this system is taken into account considering a modified interaction of Keldysh type. Having calculated the real and imaginary parts of the retarded self-energy, we find the spectral function and discuss the impact of extrinsic variables such as the dielectric medium and the charge carrier density on the appearance and position of the quasiparticle peaks. We also report the results of the renormalization constant and the effective Fermi velocity calculations in a broad range of the coupling constant and carrier density. We show that the effective Fermi velocity obtained solving the self-consistent Dyson equation has an absolutely different behavior from the one found from the on-shell approximation. Our results show that the nonlocal dielectric screening of the monolayer tends to stabilize the Fermi liquid picture in $\rm{MoS_2}$ monolayer and that the interaction strength parameter of this system is a multivariable function of the coupling constant, carrier density, and also the screening length.