Interaction-Driven Metal-Insulator Transition with Charge Fractionalization

It has been proposed that an extended version of the Hubbard model which potentially hosts rich correlated physics may be well simulated by the transition metal dichalcogenide (TMD) moiré heterostructures. Motivated by recent reports of continuous metal-insulator transition (MIT) at half filling, as...

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Bibliographic Details
Published inPhysical review. X Vol. 12; no. 2; p. 021067
Main Authors Xu, Yichen, Wu, Xiao-Chuan, Ye, Mengxing, Luo, Zhu-Xi, Jian, Chao-Ming, Xu, Cenke
Format Journal Article
LanguageEnglish
Published College Park American Physical Society 01.06.2022
Subjects
Chalcogenides
Correlation
Critical point
Current carriers
Electric charge
Electrical resistivity
Heterostructures
Insulators
Kinetic energy
Metal-insulator transition
Phase transitions
Physics
Transition metal compounds
Transport properties
Unit cell
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Summary:It has been proposed that an extended version of the Hubbard model which potentially hosts rich correlated physics may be well simulated by the transition metal dichalcogenide (TMD) moiré heterostructures. Motivated by recent reports of continuous metal-insulator transition (MIT) at half filling, as well as correlated insulators at various fractional fillings in TMD moiré heterostructures, we propose a theory for the potentially continuous MIT with fractionalized electric charges. The charge fractionalization at the MIT will lead to various experimental observable effects, such as a large resistivity as well as large universal resistivity jump at the continuous MIT. These predictions are different from previously proposed theory for interaction-driven continuous MIT. Physics in phases near the MIT will also be discussed.
ISSN:2160-3308
2160-3308
DOI:10.1103/PhysRevX.12.021067