What question did this study set out to answer?

To elucidate the physical mechanisms underlying ultrafast, stacking-independent charge transfer across transition metal dichalcogenide van der Waals heterojunctions despite strong exciton binding and momentum mismatch.

May 20, 2020Nano Letters

Excitonic Effect Drives Ultrafast Dynamics in van der Waals Heterostructures

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Authors

JLJunyi LiuCalifornia State University, Northridge XZXu ZhangCalifornia State University, Northridge GLGang LüCalifornia State University, Northridge

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Implication

First-principles modeling reveals that excitonic effects accelerate ultrafast charge transfer in van der Waals heterostructures, highlighting the role of many-body electron-hole interactions.

Key Points

To elucidate the physical mechanisms underlying ultrafast, stacking-independent charge transfer across transition metal dichalcogenide van der Waals heterojunctions despite strong exciton binding and momentum mismatch.
Developed a first-principles theoretical framework to simulate exciton-phonon interactions in extended condensed-matter systems.
Modeled many-body electron-hole interactions and interfacial exciton dynamics across van der Waals heterostructures.
Demonstrated that many-body excitonic effects drive rather than impede ultrafast charge transfer by relaxing momentum conservation constraints and reducing interfacial energy gaps.
Identified a distinct two-step dynamic pathway involving ultrafast hole transfer followed by the prolonged relaxation of intermediate hot excitons.

Cite This Study

Liu et al. (2020) studied this question.

synapsesocial.com/papers/6a704fcb75498292b709b8f8 https://doi.org/10.1021/acs.nanolett.0c01519

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Implication

First-principles modeling reveals that excitonic effects accelerate ultrafast charge transfer in van der Waals heterostructures, highlighting the role of many-body electron-hole interactions.

Excitonic Effect Drives Ultrafast Dynamics in van der Waals Heterostructures

Discussion

Member takes

Implication

Key Points

Cite This Study

Excitonic Effect Drives Ultrafast Dynamics in van der Waals Heterostructures

Discussion

Member takes

Implication

Key Points

Cite This Study

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