Unequal on-site interaction effects in the one-dimensional electron system at quarter filling

Abstract The 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 tech...

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Autores principales:	Hanqin Ding, Yan Xu, Weiting Chen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/405602b46f6148028a922df29b2aa711
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spelling	oai:doaj.org-article:405602b46f6148028a922df29b2aa7112021-12-02T15:00:19ZUnequal on-site interaction effects in the one-dimensional electron system at quarter filling10.1038/s41598-021-90336-x2045-2322https://doaj.org/article/405602b46f6148028a922df29b2aa7112021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90336-xhttps://doaj.org/toc/2045-2322Abstract The 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.Hanqin DingYan XuWeiting ChenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hanqin Ding Yan Xu Weiting Chen Unequal on-site interaction effects in the one-dimensional electron system at quarter filling
description	Abstract The 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.
format	article
author	Hanqin Ding Yan Xu Weiting Chen
author_facet	Hanqin Ding Yan Xu Weiting Chen
author_sort	Hanqin Ding
title	Unequal on-site interaction effects in the one-dimensional electron system at quarter filling
title_short	Unequal on-site interaction effects in the one-dimensional electron system at quarter filling
title_full	Unequal on-site interaction effects in the one-dimensional electron system at quarter filling
title_fullStr	Unequal on-site interaction effects in the one-dimensional electron system at quarter filling
title_full_unstemmed	Unequal on-site interaction effects in the one-dimensional electron system at quarter filling
title_sort	unequal on-site interaction effects in the one-dimensional electron system at quarter filling
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/405602b46f6148028a922df29b2aa711
work_keys_str_mv	AT hanqinding unequalonsiteinteractioneffectsintheonedimensionalelectronsystematquarterfilling AT yanxu unequalonsiteinteractioneffectsintheonedimensionalelectronsystematquarterfilling AT weitingchen unequalonsiteinteractioneffectsintheonedimensionalelectronsystematquarterfilling
_version_	1718389195048747008

Unequal on-site interaction effects in the one-dimensional electron system at quarter filling

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