Conductivity of interacting spinless fermion systems via the high-dimensional approach

✍ Scribed by Götz S. Uhrig

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 232 KB
• Volume: 206-207
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(94)00560-i

✦ Synopsis

Spinless fermions with repulsion are treated non-perturbatively by classifying the diagrams of the generating functional q~ in powers of the inverse lattice dimension l/d. The equations derived from the first two orders are evaluated on the one-and on the two-particle level. The order parameter of the AB-charge density wave (AB-CDW) occurring at larger interaction is calculated at d = 3. The Bethe-Salpeter equation is evaluated for the conductivity ~r(w) which is found to have two peaks within the energy gap 2/I in the AB-CDW: a remnant of the Drude peak and an excitonic resonance. Unexpectedly, CrDC does not vanish for T---~0