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Updated: Nov 4, 2025

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Published on: August 2, 2019
Unequal on-site interaction effects in the one-dimensional electron system at quarter filling
Hanqin Ding1,2, Yan Xu3, Weiting Chen3
1School of Physical Science and Technology, Xinjiang University, Urumqi, 830046, China. dinghq@xju.edu.cn.
Abstract:
The one-dimensional antiferromagnetic correlated electron system described by the unusual t-U-J model with alternating on-site interactions at odd ([Formula: see text]) and even ([Formula: see text]) 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 ([Formula: see text]) causes the occurrence of umklapp processes and the generation of a charge excitation gap. Contrary to the usual case ([Formula: see text]), the system is not metallic but insulating. For [Formula: see text], the system is in a spin-gapped phase with charge-density-wave (CDW) instability; for [Formula: see text], 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.
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