论文标题
MOS $ _2 $单层中的多体交换相关效应：非本地介电筛选的关键作用
Many-body exchange-correlation effects in MoS$_2$ monolayer: The key role of nonlocal dielectric screening
论文作者
论文摘要
我们计算$ \ rm {mos_2} $单层$ t = 0 $的准粒子属性，考虑到随机相位 - 估计性（RPA）内的动态电子 - 电子相互作用效果。对$ \ rm {mos_2} $单层的电子掺杂的平板进行了计算，该计算使用最小的大型狄拉克汉密尔顿（Dirac Hamiltonian）以及该系统中库仑相互作用的quasi-two二维性质，考虑考虑了Keldysh类型的修改相互作用。在计算了智障自能力的真实和虚构部分之后，我们找到了光谱函数，并讨论了外部变量（例如介电介质）和电荷载体密度对准粒子峰外观和位置的影响。我们还报告了重新归一化常数的结果和有效的费米速度计算，以耦合常数和载体密度范围广泛。我们表明，获得的有效的费米速度求解了自洽的戴森方程与从壳上近似中发现的行为绝对不同。我们的结果表明，单层的非局部介电筛选倾向于以$ \ rm {mos_2} $单层稳定费米液体图片，并且该系统的相互作用强度参数是耦合常数，载波密度的多变量函数，也是筛选长度。
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.
