Bidirectional phonon emission in two-dimensional heterostructures triggered by ultrafast charge transfer

Sood, Aditya; Haber, Jonah B.; Carlström, Johan; Peterson, Elizabeth A.; Barré, Elyse; Georgaras, Johnathan D; Reid, Alexander H.; Shen, Xiaozhe; Zajac, Marc; Regan, Emma C.; Yang, Jie; Taniguchi, Takashi; Watanabe, Kenji; Wang, Feng; Wang, X. J.; Neaton, Jeffrey B.; Heinz, Tony F.; Lindenberg, Aaron M.; Jornada, Felipe H. da; Raja, Archana

doi:10.1038/s41565-022-01253-7

Cited by 23 publications

(24 citation statements)

References 48 publications

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“…The upper and lower bounds in G 1 and G 2 are determined by their variations that correspond to a 15% increase in the SSE from its global-minimal value (the global minimum point in SSE is achieved at 5.6 MW·m –2 ·K –1 for G 1 and 9 MW·m –2 ·K –1 for G 2 ). We note that these values are in good alignment with previous reports of the values for G ( h -BN/WS 2 ) and G (WS 2 /SiO 2 ) measured from time-resolved ultrafast electron diffraction or the optothermal Raman technique. − Comparisons of the experimental and fitted results are displayed in Figure c (for the short timescale) and Figure d (for the longer timescale) in conjunction with the determined SSE values.…”

Section: Resultssupporting

confidence: 87%

“…Furthermore, upgrading the reported spectroscopy setup to a wide-field microscopy configuration may allow for the imaging of interfaces in spatially inhomogeneous 2D heterostructures. The impulsive phonon excitation can also be exploited as a tuning knob of the electronic and optical properties of 2D heterostructures via interfacial electron–phonon interactions. ,, …”

Section: Discussionmentioning

confidence: 99%

“…The impulsive phonon excitation can also be exploited as a tuning knob of the electronic and optical properties of 2D heterostructures via interfacial electron− phonon interactions. 61,64,65 ■ ASSOCIATED CONTENT…”

Section: ■ Conclusionmentioning

confidence: 99%

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Direct Spectroscopic Observation of Cross-Plane Heat Transfer in a Two-Dimensional Van der Waals Heterostructure

Fortin-Deschênes

Lou

et al. 2023

J. Phys. Chem. C

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Two-dimensional (2D) transition metal chalcogenides (TMDs) have drawn significant attention in recent years due to their extraordinary optical and electronic properties. As heat transfer plays an important role in device performance, various methods such as optothermal Raman spectroscopy and time-domain thermoreflectance have been developed to measure the thermal conductivity and interfacial thermal conductance in 2D van der Waals (vdW) heterostructures. Here, we employ the vibrational-pump-visible-probe (VPVP) spectroscopy to directly visualize the heat transfer process in a heterostructure of multilayer h-BN and monolayer WS2. Following an impulsive vibrational excitation of h-BN in the mid-infrared, we probe the heat transfer from h-BN through WS2 and finally to the substrate from the subpicosecond to the submicrosecond timescale. The interfacial thermal conductance of the h-BN/WS2 and WS2/SiO2 interfaces is obtained by corroborating the experiments with heat transfer calculations based on the Fourier’s law of heat conduction. Our study demonstrates an alternative, time-resolved optical method to measure cross-plane heat dissipation and opens up a new pathway to investigate the interlayer electron–phonon and phonon–phonon interactions in vdW heterostructures.

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Section: Resultssupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

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Direct Spectroscopic Observation of Cross-Plane Heat Transfer in a Two-Dimensional Van der Waals Heterostructure

Fortin-Deschênes

Lou

et al. 2023

J. Phys. Chem. C

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“…[23][24][25][26] Due to the robust type-II band alignment, WSe 2 /WS 2 vdW heterostructure has attracted considerable attention. [27][28][29][30][31][32][33][34][35][36][37][38] In vertical heterostructures, the vdW gap between monolayer components offers space for the intercalation of ions and molecules, thereby giving rise to new opportunities for property modulation. It has been evidenced that ion intercalation into TMD heterostructures has a significant impact on the chemical and physical properties and leads to broad applications in energy storage.…”

Section: Introductionmentioning

confidence: 99%

“…23–26 Due to the robust type-II band alignment, WSe 2 /WS 2 vdW heterostructure has attracted considerable attention. 27–38…”

Section: Introductionmentioning

confidence: 99%

The effects of intercalated environmental gas molecules on carrier dynamics in WSe₂/WS₂heterostructures

et al. 2023

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Transient Nanoscopy of Exciton Dynamics in 2D Transition Metal Dichalcogenides

Li,

Yang,

Higashitarumizu

et al. 2024

Advanced Materials

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The electronic and optical properties of two‐dimensional (2D) transition metal dichalcogenides are dominated by strong excitonic resonances. Exciton dynamics plays a critical role in the functionality and performance of many miniaturized 2D optoelectronic devices; however, the measurement of nanoscale excitonic responses remains challenging. Here, a near‐field transient nanoscopy is reported to probe exciton dynamics beyond the diffraction limit. Exciton recombination and exciton‐exciton annihilation processes in monolayer and bilayer MoS2 are studied as the proof‐of‐concept demonstration. Moreover, with the capability to access local sites, intriguing exciton dynamics near the monolayer‐bilayer interface and at the MoS2 nano‐wrinkles are resolved. Such nanoscale resolution highlights the potential of this transient nanoscopy for fundamental investigation of exciton physics and further optimization of functional devices.This article is protected by copyright. All rights reserved

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Bidirectional phonon emission in two-dimensional heterostructures triggered by ultrafast charge transfer

Cited by 23 publications

References 48 publications

Direct Spectroscopic Observation of Cross-Plane Heat Transfer in a Two-Dimensional Van der Waals Heterostructure

Direct Spectroscopic Observation of Cross-Plane Heat Transfer in a Two-Dimensional Van der Waals Heterostructure

The effects of intercalated environmental gas molecules on carrier dynamics in WSe₂/WS₂heterostructures

Transient Nanoscopy of Exciton Dynamics in 2D Transition Metal Dichalcogenides

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Bidirectional phonon emission in two-dimensional heterostructures triggered by ultrafast charge transfer

Cited by 23 publications

References 48 publications

Direct Spectroscopic Observation of Cross-Plane Heat Transfer in a Two-Dimensional Van der Waals Heterostructure

Direct Spectroscopic Observation of Cross-Plane Heat Transfer in a Two-Dimensional Van der Waals Heterostructure

The effects of intercalated environmental gas molecules on carrier dynamics in WSe2/WS2heterostructures

Transient Nanoscopy of Exciton Dynamics in 2D Transition Metal Dichalcogenides

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Product

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The effects of intercalated environmental gas molecules on carrier dynamics in WSe₂/WS₂heterostructures