Two interacting particles at the metal-insulator transition

Дата и время публикации : 1998-08-18T10:46:22Z

Авторы публикации и институты :
Andrzej Eilmes
Uwe Grimm
Rudolf A. Roemer
Michael Schreiber

Ссылка на журнал-издание: Eur. Phys. J. B 8, 547-554 (1999)
Коментарии к cтатье: 26 RevTeX 3.0 pages with 10 EPS-figures included
Первичная категория: cond-mat.dis-nn

Все категории : cond-mat.dis-nn, cond-mat.str-el

Краткий обзор статьи: To investigate the influence of electronic interaction on the metal-insulator transition (MIT), we consider the Aubry-Andr’{e} (or Harper) model which describes a quasiperiodic one-dimensional quantum system of non-interacting electrons and exhibits an MIT. For a two-particle system, we study the effect of a Hubbard interaction on the transition by means of the transfer-matrix method and finite-size scaling. In agreement with previous studies we find that the interaction localizes some states in the otherwise metallic phase of the system. Nevertheless, the MIT remains unaffected by the interaction. For a long-range interaction, many more states become localized for sufficiently large interaction strength and the MIT appears to shift towards smaller quasiperiodic potential strength.

Category: Physics