Charge- and spin-susceptibilities in the one-dimensional hubbard model with long-range interaction

✍ Scribed by S. Yunoki; K. Tsutsui; Y. Ohta; S. Maekawa

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 203 KB
• Volume: 235-240
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)92373-6

✦ Synopsis

Effects of long-range Coulomb interaction in one-dimensional electron systems are studied. By using a quantum Monte Carlo method, we obtain that the zero-frequency wave-number dependent charge susceptibility at quarterfilling shows both 2kF and 4kF singularities, kF being the Fermi wave munber, in contrast with the Hubbard model with the on-site and nearest-neighbor interactions. The results are in accord with the X-ray exl)eriments in (NMP)~(Phen)t-~(TCNQ). The power-law exponent a in the spectral function p(w) ,-, [,z [" observed in the high-resolution photoemission experiments is calculated by using the exact diagonalization nwthod and found to increase with increasing the range of the interaction.

In the low-dimensional electron systems, the charge screening is less complete. Actually, several experiments in quasi-one-dimensional conductors suggest that the long-range Coulomb interaction between electrons is of crucial importance.

Epstein etal. [1] have shown in