Detection of Pairing from the Extended Aharonov-Bohm Period in Strongly Correlated Electron Systems

抄録

Inspired by Sutherland's work [Phys. Rev. Lett. 74 (1995) 816] on the detection of bound spin waves, we propose that bound electron states can be detected from the dependence of interacting electron systems on the Aharonov-Bohm flux in the `extended zone' scheme, where the electron pairing halves the original period of N_a flux quanta in a system of linear size N_a. Along with the Bethe ansatz analysis, a numerical implementation for keeping track of the adiabatic flow of energy levels is applied to the attractive/repulsive Hubbard model and the t-J ladder.