Exploring the regulatory effect of stacked layers on moiré excitons in twisted WSe2/WSe2/WSe2 homotrilayer

Zheng, Haihong; Wu, Biao; Wang, Changtian; Li, Shaofei; He, Jun; Liu, Zongwen; Wang, Jiantao; Duan, Ji-an; Liu, Yanping

doi:10.1007/s12274-023-5822-8

Cited by 6 publications

(4 citation statements)

References 37 publications

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“…In addition to interlayer twist and temperature, various factors in twisted vdW heterostructures have shown the ability to modulate the localization of moiré excitons in recent researches. Cai and co-workers [161] focused on the formation mechanism of numerous PL peaks from localized interlayer excitons in moiré superlattices. They constructed an interlayer donor-acceptor pair exciton (DAP IX) dynamic model to explain the origins of these narrow excitonic peaks, where the localized DAP exciton has an electron trapped in the donor site and a hole trapped in the acceptor site.…”

Section: Localization and Modulation Of Excitons By Moiré Superlatticementioning

confidence: 99%

“…Therefore, this method requires a tip made from stronger materials to achieve a higher limit [168]. Cai et al [161] utilized a nanopillar array placed under the hBN-encapsulated MoSe 2 /WSe 2 heterostructures to introduce strain-enhanced coupling and strain gradientinduced funneling, which helped them to corroborate and develop the DAP IX dynamic model for understanding the primary origin of moiré localized interlayer excitons.…”

Section: ĉ3mentioning

confidence: 99%

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Twistronics and moiré excitonic physics in van der Waals heterostructures

Li,

Wei,

Liu

et al. 2024

Front. Phys.

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Heterostructures composed of two-dimensional van der Waals (vdW) materials allow highly controllable stacking, where interlayer twist angles introduce a continuous degree of freedom to alter the electronic band structures and excitonic physics. Motivated by the discovery of Mott insulating states and superconductivity in magic-angle bilayer graphene, the emerging research fields of “twistronics” and moiré physics have aroused great academic interests in the engineering of optoelectronic properties and the exploration of new quantum phenomena, in which moiré superlattice provides a pathway for the realization of artificial excitonic crystals. Here we systematically summarize the current achievements in twistronics and moiré excitonic physics, with emphasis on the roles of lattice rotational mismatches and atomic registries. Firstly, we review the effects of the interlayer twist on electronic and photonic physics, particularly on exciton properties such as dipole moment and spin-valley polarization, through interlayer interactions and electronic band structures. We also discuss the exciton dynamics in vdW heterostructures with different twist angles, like formation, transport and relaxation processes, whose mechanisms are complicated and still need further investigations. Subsequently, we review the theoretical analysis and experimental observations of moiré superlattice and moiré modulated excitons. Various exotic moiré effects are also shown, including periodic potential, moiré miniband, and varying wave function symmetry, which result in exciton localization, emergent exciton peaks and spatially alternating optical selection rule. We further introduce the expanded properties of moiré systems with external modulation factors such as electric field, doping and strain, showing that moiré lattice is a promising platform with high tunability for optoelectronic applications and in-depth study on frontier physics. Lastly, we focus on the rapidly developing field of correlated electron physics based on the moiré system, which is potentially related to the emerging quantum phenomena.

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Section: Localization and Modulation Of Excitons By Moiré Superlatticementioning

confidence: 99%

Section: ĉ3mentioning

confidence: 99%

Twistronics and moiré excitonic physics in van der Waals heterostructures

Li,

Wei,

Liu

et al. 2024

Front. Phys.

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“…Due to its unique photoelectric properties [1][2][3][4][5][6][7][8] , including layer-modulated bandgaps, moderate mobility 2 , a high on-off ratio 9 , and a noticeable spin-orbit coupling effect 1 , the monolayer transition-metal dichalcogenide (TMDC) WSe 2 has recently garnered signi cant interest in the elds of atomically thin electronics and optoelectronics [10][11][12][13] . The utilization of monolayer WSe 2 , whether in its intrinsic form or as part of tailored heterostructures hybridized with other materials, substantially enhances the performance of related optoelectronic devices and imparts a range of unique features to them 9 .…”

Section: Introductionmentioning

confidence: 99%

Temperature Dependence of the Dielectric Function and Critical Points of Monolayer WSe2

Nguyen,

Le,

Kim

et al. 2024

Preprint

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Monolayer materials typically display intriguing temperature-dependent dielectric and optical properties, which are crucial for improving the structure and functionality of associated devices. Due to its unique photoelectric capabilities, monolayer WSe2 has recently received a lot of attention in the fields of atomically thin electronics and optoelectronics. In this work, we focus on the evolution of the temperature-dependent dielectric and optical properties of 2D WSe2 over energies from 0.74 to 6.40 eV and temperatures from 40 K to 350 K. We analyze second derivatives with respect to energy to locate the critical points (CP). The dependence of the observed CP energies on temperature is consistent with the alternative domination of the declining exciton binding energy as the temperature increases.

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“…Due to its unique photoelectric properties 1 – 8 , including layer-modulated bandgaps, moderate mobility 2 , a high on–off ratio 9 , and a noticeable spin–orbit coupling effect 1 , the monolayer WSe 2 , a two-dimensional transition-metal dichalcogenide (2D-TMDC) has recently garnered significant interest in the fields of atomically thin electronics and optoelectronics 10 – 13 . The low dimensional materials have strong Coulomb interaction by reducing dielectric screening and confining electron motion spatially, leading to the formation of highly stable, tightly bound electron–hole pairs known as excitons, characterized by substantial binding energy 14 , 15 .…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of the dielectric function and critical points of monolayer WSe2

Nguyen,

Le,

Kim

et al. 2024

Sci Rep

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Monolayer materials typically display intriguing temperature-dependent dielectric and optical properties, which are crucial for improving the structure and functionality of associated devices. Due to its unique photoelectric capabilities, monolayer WSe2 has recently received a lot of attention in the fields of atomically thin electronics and optoelectronics. In this work, we focus on the evolution of the temperature-dependent dielectric function (ε = ε1 + i ε2) of monolayer WSe2 over energies from 0.74 to 6.40 eV and temperatures from 40 to 350 K. We analyze the second derivatives of ε with respect to energy to accurately locate the critical points (CP). The dependence of the observed CP energies on temperature is consistent with the alternative domination of the declining exciton binding energy as the temperature increases.

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Exploring the regulatory effect of stacked layers on moiré excitons in twisted WSe2/WSe2/WSe2 homotrilayer

Cited by 6 publications

References 37 publications

Twistronics and moiré excitonic physics in van der Waals heterostructures

Twistronics and moiré excitonic physics in van der Waals heterostructures

Temperature Dependence of the Dielectric Function and Critical Points of Monolayer WSe2

Temperature dependence of the dielectric function and critical points of monolayer WSe2

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