Physics – Condensed Matter
Scientific paper
1996-10-29
Physics
Condensed Matter
26 pages, RevTex, 16 figures available on request from arita@cms.phys.s.u-tokyo.ac.jp, to be published in J. Phys. Soc. Jpn 66
Scientific paper
10.1143/JPSJ.66.2086
The `extended Aharonov-Bohm (AB) period' recently proposed by Kusakabe and Aoki [J. Phys. Soc. Jpn (65), 2772 (1996)] is extensively studied numerically for finite size systems of strongly correlated electrons. While the extended AB period is the system length times the flux quantum for noninteracting systems, we have found the existence of the boundary across which the period is halved or another boundary into an even shorter period on the phase diagram for these models. If we compare this result with the phase diagram predicted from the Tomonaga-Luttinger theory, devised for low-energy physics, the halved period (or shorter periods) has a one-to-one correspondence to the existence of the pairing (phase separation or metal-insulator transition) in these models. We have also found for the t-J model that the extended AB period does not change across the integrable-nonintegrable boundary despite the totally different level statistics.
Aoki Hideo
Arita Ryotaro
Kuroki Kazuhiko
Kusakabe Koichi
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