Author:
Ding Hanqin,Xu Yan,Chen Weiting
Abstract
AbstractThe one-dimensional antiferromagnetic correlated electron system described by the unusual t–U–J model with alternating on-site interactions at odd ($$U_o$$
U
o
) and even ($$U_e$$
U
e
) sites is studied analytically. At weak coupling, the use of bosonization and renormalization-group techniques helps to obtain ground-state phase diagram. At quarter filling, the unequal on-site repulsion ($$U_e\ne U_o$$
U
e
≠
U
o
) causes the occurrence of umklapp processes and the generation of a charge excitation gap. Contrary to the usual case ($$U_e=U_o$$
U
e
=
U
o
), the system is not metallic but insulating. For $$U_e+U_o<2J$$
U
e
+
U
o
<
2
J
, the system is in a spin-gapped phase with charge-density-wave (CDW) instability; for $$U_e+U_o\ge 2J$$
U
e
+
U
o
≥
2
J
, the system is in a spin-gapless phase characterized by the coexistence of both CDW and spin-density-wave (SDW) instabilities, where the SDW correlation dominates over the CDW one.
Publisher
Springer Science and Business Media LLC
Cited by
2 articles.
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