Broadening and sharpening of the Drude peak through antiferromagnetic fluctuations

Article

关键词: QUANTUM MONTE-CARLO;    ELECTRON THEORY;    SPIN;    BOUNDS;   

DOI  :  10.1103/PhysRevB.104.115153

来源: SCIE

【 摘 要 】

Antiferromagnetic or charge density wave fluctuations couple with light through the recently discovered pi-ton contribution to the optical conductivity, and quite generically constitute the dominant vertex corrections in low-dimensional correlated electron systems. Here we study the arguably simplest version of these pi-tons based on the semianalytical random phase approximation (RPA) ladder in the transversal particle-hole channel. The vertex corrections to the optical conductivity are calculated directly for real frequencies. We validate that the RPA qualitatively reproduces the pi-ton vertex corrections to the Drude peak in the Hubbard model. Depending on the temperature we find vertex corrections to broaden or sharpen the Drude peak.

【 授权许可】

Free