Shift of the SDW Wave Vector in the Transient Region in the Anisotropic 2D Hubbard Model

Abstract

A variational procedure shows that two new types of spin density wave (SDW) ground states appear successively in the titled system modeling the Bechgaard salts, when the transverse transfer energy increases around its upper bound imposed for the usual SDW state having the so far known best nesting wave vector. From this value the wave vectors of the new states are appreciably shifted, entailing uncompensated carrier pockets of the size found in the Shubnikov-de Haas experiments. An analytic expression clarifying the situation of the starting-point of the shift shows that the shift is sensitive to details of the system.