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20 April 2024

» arxiv » cond-mat/9712134

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DMRG study of the spin gap in a one dimensional Hubbard model: effect of the distant transfer and exchange coupling
Ryotaro Arita ; Kazuhiko Kuroki ; Hideo Aoki ; Michele Fabrizio ;
Date:	12 Dec 1997
Subject:	cond-mat
Abstract:	The spin gap of a one-dimensional repulsive Hubbard model is numerically calculated with the density matrix renormalization group, with a special emphasis on the effect of a next-nearest neighbor hopping (t’) and the nearest-neighbor ferromagnetic exchange (J) interaction. At half-filling, a significant spin gap opens if \|t’\| simeq \|t\| and J=0, in agreement with the weak coupling theory, while the gap is strongly suppressed by the introduction of J. On the other hand, the quarter-filled system has very small spin gaps regardless of the values of t’ and J. Implications for the CuO_2 chain in Sr_{14}Cu_{24}O_{41} and related materials are discussed.
Source:	arXiv, cond-mat/9712134
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