Doping-dependent magnetization plateaux in p-merized Hubbard chains

Details Doping-dependent magnetization plateaux in p-merized Hubbard chains Doping-dependent magnetization plateaux in p-merized Hubbard chains

1999-08-27

arxiv.org/abs/cond-mat/9908398v2

Phys. Lett. A268 (2000) 418-423

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages REVTeX, 3 PostScript figures included using psfig.sty; this is the final version to appear in Phys. Lett. A; substanti

Scientific paper

10.1016/S0375-9601(00)00210-3

We study zero-temperature Hubbard chains with periodically modulated hopping at arbitrary filling n and magnetization m. We show that the magnetization curves have plateaux at certain values of m which depend on the periodicity p and the filling. At commensurate filling n a charge gap opens and then magnetization plateaux correspond to fully gapped situations. However, plateaux also arise in the magnetization curves at fixed n between the commensurate values and then the plateau-value of of m depends continuously on n and can thus also become irrational. In particular for the case of dimerized hopping (p=2) and fixed doping we find that a plateau appears at m=1-n. In this case, there is still a gapless mode on the plateau leading to thermodynamic behavior which is different from a completely gapped situation.

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