论文标题
电子相关性对COSI非平凡拓扑费的影响
Electronic correlations effect on nontrivial topological fermions in CoSi
论文作者
论文摘要
已经进行了本研究，以了解电子相关性对COSI最近发现的费米子的影响。为此，通过使用DFT+DMFT Advanced方法在T = 100 K时使用和不包括自旋轨道耦合（SOC）的DFT+DMFT Advanced方法来研究了COSI的体光函数和（001）。与其他理论和实验报告相似，所有新发现的费米子都以$γ$和$ r $ $ $的积分观察到。我们对批量状态的DFT+DMFT计算以$ m $点显示了一个额外的孔口袋。在散装COSI的光谱中都观察到了相干和不连贯的特征。这表明存在Quasiparticle-Quasiparticle（QP-QP）相互作用，最终影响了外来费米金QP的寿命（$τ$）。例如，发现不考虑SOC时，发现QPS的计算$τ$分别为$ω\ SIM \ SIM $ -30和-186 MEV，分别为$ \ sim 10^{ - 9} $ s和$ \ sim 10^{ - 12} $ S，当不考虑SOC时。但是，$ g_0w_0 $校正已显示为$γ$的spin-1 fermionic Qp $τ$是无限的，而对于$ r $ $ r $ point的双weyl fermionic qp at $ \ sim 10^{ - 12} $ s。他们的有效质量（$ m^*$）也分别计算为$ \ sim $ 1.60和1.64，分别为$γ$和$ r $ $。此外，t = 100 k（001）表面的光谱函数也显示出相干和不连贯的特征。因此，在$ω$ = 0的表面状态下，已经计算出没有SOC和SOC包含的订单$ \ sim 10^{ - 8} $ s的顺序。
The present study has been carried out to understand the effect of electronic correlations on the recently found fermions in CoSi. For which the spectral functions of bulk and (001) surface of CoSi have been investigated by using DFT+DMFT advanced methodology at T = 100 K with and without inclusion of spin-orbit coupling (SOC). All the newly found fermions are observed at $Γ$ and $R$ points similar to other theoretical and experimental reports. Our DFT+DMFT calculations for the bulk states have shown one extra hole pocket at $M$ point. Both coherent and incoherent features have been observed in the spectra of bulk CoSi. This indicates the presence of quasiparticle-quasiparticle (QP-QP) interactions which is eventually affecting the lifetime ($τ$) of exotic fermionic QPs. For instance, the calculated $τ$ for QPs at $ω\sim $ -30 and -186 mev are found to be $\sim 10^{-9}$ s and $\sim 10^{-12}$ s, respectively when SOC is not considered. However, $G_0W_0$ corrections have shown $τ$ for spin-1 fermionic QP at $Γ$ to be infinite while for double Weyl fermionic QP at $R$ point to be $\sim 10^{-12}$ s. Their effective masses ($m^*$) have also been calculated as $\sim$ 1.60 and 1.64 at $Γ$ and $R$ points, respectively. Furthermore, the spectral functions at T = 100 K of (001) surface have also shown both coherent and incoherent features. Consequently, at $ω$ = 0 for surface states $τ$ has been calculated of the order $\sim 10^{-8}$s for both without SOC and with SOC inclusions.
