Interaction enhanced inter-site hoppings for holons and interlayer exciton insulators in moiré correlated insulators

doi:10.1088/1674-1056/adcb9b

中国物理B ›› 2025, Vol. 34 ›› Issue (9): 97303-097303.doi: 10.1088/1674-1056/adcb9b

所属专题： SPECIAL TOPIC — Moiré physics in two-dimensional materials

Interaction enhanced inter-site hoppings for holons and interlayer exciton insulators in moiré correlated insulators

Zijian Ma(马子健)¹ and Hongyi Yu(俞弘毅)^1,2,†

1 Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing & School of Physics and Astronomy, Sun Yat-Sen University (Zhuhai Campus), Zhuhai 519082, China;
2 State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University (Guangzhou Campus), Guangzhou 510275, China

收稿日期:2025-02-10 修回日期:2025-03-20 接受日期:2025-04-11 出版日期:2025-08-21 发布日期:2025-08-28
通讯作者: Hongyi Yu E-mail:yuhy33@mail.sysu.edu.cn
基金资助:
H.Y. acknowledges support by the National Natural Science Foundation of China (Grant No. 12274477) and the Department of Science and Technology of Guangdong Province in China (Grant No. 2019QN01X061).

Interaction enhanced inter-site hoppings for holons and interlayer exciton insulators in moiré correlated insulators

Zijian Ma(马子健)¹ and Hongyi Yu(俞弘毅)^1,2,†

1 Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing & School of Physics and Astronomy, Sun Yat-Sen University (Zhuhai Campus), Zhuhai 519082, China;
2 State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University (Guangzhou Campus), Guangzhou 510275, China

Received:2025-02-10 Revised:2025-03-20 Accepted:2025-04-11 Online:2025-08-21 Published:2025-08-28
Contact: Hongyi Yu E-mail:yuhy33@mail.sysu.edu.cn
Supported by:
H.Y. acknowledges support by the National Natural Science Foundation of China (Grant No. 12274477) and the Department of Science and Technology of Guangdong Province in China (Grant No. 2019QN01X061).

摘要/Abstract

摘要： In moiré-patterned van der Waals structures of transition metal dichalcogenides, correlated insulators can form under integer and fractional fillings, whose transport properties are governed by various quasiparticle excitations including holons, doublons and interlayer exciton insulators. Here we theoretically investigate the nearest-neighbor inter-site hoppings of holons and interlayer exciton insulators. Our analysis indicates that these hopping strengths are significantly enhanced compared to that of a single carrier. The underlying mechanism can be attributed to the strong Coulomb interaction between carriers at different sites. For the interlayer exciton insulator consisting of a holon and a carrier in different layers, we have also obtained its effective Bohr radius and energy splitting between the ground and the first-excited states.

Abstract: In moiré-patterned van der Waals structures of transition metal dichalcogenides, correlated insulators can form under integer and fractional fillings, whose transport properties are governed by various quasiparticle excitations including holons, doublons and interlayer exciton insulators. Here we theoretically investigate the nearest-neighbor inter-site hoppings of holons and interlayer exciton insulators. Our analysis indicates that these hopping strengths are significantly enhanced compared to that of a single carrier. The underlying mechanism can be attributed to the strong Coulomb interaction between carriers at different sites. For the interlayer exciton insulator consisting of a holon and a carrier in different layers, we have also obtained its effective Bohr radius and energy splitting between the ground and the first-excited states.

Key words: correlated insulator, holon, interlayer exciton insulator, moiré, pattern

中图分类号: (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

73.20.Mf

73.20.Qt (Electron solids) 73.21.Ac (Multilayers) 73.21.Cd (Superlattices)

Zijian Ma(马子健) and Hongyi Yu(俞弘毅). Interaction enhanced inter-site hoppings for holons and interlayer exciton insulators in moiré correlated insulators[J]. 中国物理B, 2025, 34(9): 97303-097303.

Zijian Ma(马子健) and Hongyi Yu(俞弘毅). Interaction enhanced inter-site hoppings for holons and interlayer exciton insulators in moiré correlated insulators[J]. Chin. Phys. B, 2025, 34(9): 97303-097303.

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Interaction enhanced inter-site hoppings for holons and interlayer exciton insulators in moiré correlated insulators

Interaction enhanced inter-site hoppings for holons and interlayer exciton insulators in moiré correlated insulators

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