Twist-angle-dependent interlayer exciton diffusion in WS2–WSe2 heterobilayers

Yuan, Long; Zheng, Biyuan; Kunstmann, Jens; Brumme, Thomas; Kuc, Agnieszka; Ma, Chao; Deng, Shibin; Blach, Daria D.; Pan, Anlian; Huang, Libai

doi:10.1038/s41563-020-0670-3

Cited by 222 publications

(281 citation statements)

References 44 publications

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“…The lifetime of the exciton is estimated on the basis of the spontaneous emission rate, and the exciton hopping rates are determined by the Förster theory (details in Materials and Methods). Using Monte Carlo (MC) simulations, we estimate that the lifetime of the moiré exciton is ~1 ns, similar to the experimental results of 1.8 ns in the MoSe 2 /WSe 2 heterostructure (26) and 970 ± 180 ps in WS 2 / WSe 2 heterostructures (52). Note that other experiments have reported much longer lifetimes (8, 55).…”

Section: Diffusion Of Moiré Excitonssupporting

confidence: 83%

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Shedding light on moiré excitons: A first-principles perspective

2020

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Moiré superlattices in van der Waals (vdW) heterostructures could trap long-lived interlayer excitons. These moiré excitons could form ordered quantum dot arrays, paving the way for unprecedented optoelectronic and quantum information applications. Here, we perform first-principles simulations to shed light on moiré excitons in twisted MoS2/WS2 heterostructures. We provide direct evidence of localized interlayer moiré excitons in vdW heterostructures. The interlayer and intralayer moiré potentials are mapped out based on spatial modulations of energy gaps. Nearly flat valence bands are observed in the heterostructures. The dependence of spatial localization and binding energy of the moiré excitons on the twist angle of the heterostructures is examined. We explore how vertical electric field can be tuned to control the position, polarity, emission energy, and hybridization strength of the moiré excitons. We predict that alternating electric fields could modulate the dipole moments of hybridized moiré excitons and suppress their diffusion in moiré lattices.

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Section: Diffusion Of Moiré Excitonssupporting

confidence: 83%

“…Although the moiré excitons are localized, they can nonetheless tunnel through the moiré potentials and diffuse over long distances (52). Thus, the ability to control exciton diffusion-either enhancement or suppression-is of substantial interest.…”

Section: Diffusion Of Moiré Excitonsmentioning

confidence: 99%

Shedding light on moiré excitons: A first-principles perspective

2020

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“…These effects are now actively studied in TMDC-based and other layered nanosystems. [52][53][54][55][56] Finally, we discuss collective properties of these polaronic systems. First, lattice deformation and phonon clouds surrounding the exciton, will influence the interactions between two excitons.…”

Section: Discussion: Experimental Consequences and Related Effectsmentioning

confidence: 99%

Interlayer Exciton–Polaron in Atomically Thin Semiconductors

2020

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A novel type of exciton-phonon bound state-interlayer polaron-in a double-layer 2D semiconductor with transition metal dichalcogenides as an example, is predicted. In these systems, the interaction of the interlayer exciton with the soft modes of out-of-plane lattice vibrations caused by van der Waals forces and flexural rigidity gives rise to a bound quasiparticle. The energy and effective mass of the formed polaron for weak and strong exciton-phonon coupling regimes are calculated and analyzed. Possible manifestations of these effects in transport-and spectroscopy-related experiments are discussed.

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“…Morie design principle can be applied to epitaxially grown thin films on dielectric substrates [303]. Recent experiments on interlayer excitons in TMDC heterobilayers have revealed the trapping of these excitons on the moire potential landscape [304][305][306][307]. When placed in an optical cavity, such moire trapped excitons may form an exciton polariton lattice and serve as analog quantum simulators (QSs) (see polaritonic lattices and quantum simulators).…”

Section: Dn Basov Et Al: Polariton Panoramamentioning

confidence: 99%

Polariton panorama

et al. 2020

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In this brief review, we summarize and elaborate on some of the nomenclature of polaritonic phenomena and systems as they appear in the literature on quantum materials and quantum optics. Our summary includes at least 70 different types of polaritonic light–matter dressing effects. This summary also unravels a broad panorama of the physics and applications of polaritons. A constantly updated version of this review is available at https://infrared.cni.columbia.edu.

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Twist-angle-dependent interlayer exciton diffusion in WS2–WSe2 heterobilayers

Cited by 222 publications

References 44 publications

Shedding light on moiré excitons: A first-principles perspective

Shedding light on moiré excitons: A first-principles perspective

Interlayer Exciton–Polaron in Atomically Thin Semiconductors

Polariton panorama

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