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

doi:10.1088/1674-1056/adcb9b

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.

Keywords: correlated insulator holon interlayer exciton insulator moiré pattern

Received: 10 February 2025
Revised: 20 March 2025
Accepted manuscript online: 11 April 2025

PACS:	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
	73.20.Qt	(Electron solids)
	73.21.Ac	(Multilayers)
	73.21.Cd	(Superlattices)

Fund: 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).

Corresponding Authors: Hongyi Yu
E-mail: yuhy33@mail.sysu.edu.cn

Cite this article:

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 2025 Chin. Phys. B 34 097303

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

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