D. A. Shohonov

Raman scattering in a MoS₂ monolayer on a quartz substrate is studied using density functional theory. We have considered several types of MoS₂/SiO₂ interfaces that can be implemented. The first type of interface corresponds to the case of a “dense” SiO₂ surface. Interfaces with various defects and roughness on the surface of quartz are considered, as is an interface with S–O chemical bonds. Calculations show that, in the case of van der Waals interaction, the substrate in general weakly affects Raman scattering in MoS₂. The influence of the substrate in the presence of S–O chemical bonds is much stronger, leading to a noticeable splitting and shift of the E and A Raman peaks in the MoS₂ monolayer.

In our letter we establish coupling of the effective Heisenberg–Euler Lagrangian on the order of 1/m⁴ and the Chiral Magnetic Effect known for a massless particles. We consider a generalization of the effective Heisenberg–Euler Lagrangian from QED to QCD and then calculate the induced vector current. Further, considering the vector current, we establish a method to connect the perturbative result with the Chiral Magnetic Effect. We formulate the rule of transit from perturbation to nonperturbation (formula (5)) and obtain the well-known result for a massless particles.