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Anomalous enhancement of thermal conduction across twisted van der Waals heterointerfaces.

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Title: Anomalous enhancement of thermal conduction across twisted van der Waals heterointerfaces.
Authors: Zhang, Yufeng1, Du, Yanzheng1, Wan, Xiao1, An, Meng1, Fan, Aoran1, Li, Fengyi1, Ma, Weigang1 maweigang@tsinghua.edu.cn, Zhang, Xing1 x-zhang@tsinghua.edu.cn
Source: Proceedings of the National Academy of Sciences of the United States of America. 3/3/2026, Vol. 123 Issue 9, p1-8. 8p.
Subjects: Inelastic scattering, Van der Waals forces, Phonon-phonon interactions, Thermal analysis, Thermal conductivity
Abstract: The advent of interlayer twist has introduced a groundbreaking paradigm, unveiling novel physical phenomena spanning from correlated insulating states to superconductivity. This unprecedented platform facilitates the manipulation of electrons and extends its capabilities to the effective control of bosons. For phonons, a consensus has been reached that interlayer twist greatly suppresses phonon transport as it breaks the symmetry of the lattice. Here, we report a counterintuitive experimental observation in which the interlayer twist can significantly promote the transportation of phonons across an intrinsically asymmetric heterointerface. Employing the time-domain thermoreflectance mapping technique, our results show a 2.5-fold increase in interfacial thermal conductance (ITC) in twisted bilayer MoS2/WS2 heterostructures relative to initial commensurate configurations. Combined experimental and atomic simulation results reveal the inelastic scattering-dominated nature of thermal transport at MoS2/ WS2 heterointerfaces. The introduction of interlayer twist amplifies this effect, triggering a reconstruction of nonequilibrium phonon temperature distributions at the interface. This phenomenon activates efficient optical-to-acoustic phonon conversion through inelastic scattering and creates additional transport channels that overcome the intrinsic phonon mismatch in heterostructures. Our work establishes a paradigm for enhancing ITC by strategically introducing interlayer perturbations to amplify inelastic scattering effects. This breakthrough opens broad avenues for advanced thermal management in integrated circuits. [ABSTRACT FROM AUTHOR]
Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 192086316
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Anomalous enhancement of thermal conduction across twisted van der Waals heterointerfaces.
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  Data: <searchLink fieldCode="DE" term="%22Inelastic+scattering%22">Inelastic scattering</searchLink><br /><searchLink fieldCode="DE" term="%22Van+der+Waals+forces%22">Van der Waals forces</searchLink><br /><searchLink fieldCode="DE" term="%22Phonon-phonon+interactions%22">Phonon-phonon interactions</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+analysis%22">Thermal analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+conductivity%22">Thermal conductivity</searchLink>
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  Data: The advent of interlayer twist has introduced a groundbreaking paradigm, unveiling novel physical phenomena spanning from correlated insulating states to superconductivity. This unprecedented platform facilitates the manipulation of electrons and extends its capabilities to the effective control of bosons. For phonons, a consensus has been reached that interlayer twist greatly suppresses phonon transport as it breaks the symmetry of the lattice. Here, we report a counterintuitive experimental observation in which the interlayer twist can significantly promote the transportation of phonons across an intrinsically asymmetric heterointerface. Employing the time-domain thermoreflectance mapping technique, our results show a 2.5-fold increase in interfacial thermal conductance (ITC) in twisted bilayer MoS2/WS2 heterostructures relative to initial commensurate configurations. Combined experimental and atomic simulation results reveal the inelastic scattering-dominated nature of thermal transport at MoS2/ WS2 heterointerfaces. The introduction of interlayer twist amplifies this effect, triggering a reconstruction of nonequilibrium phonon temperature distributions at the interface. This phenomenon activates efficient optical-to-acoustic phonon conversion through inelastic scattering and creates additional transport channels that overcome the intrinsic phonon mismatch in heterostructures. Our work establishes a paradigm for enhancing ITC by strategically introducing interlayer perturbations to amplify inelastic scattering effects. This breakthrough opens broad avenues for advanced thermal management in integrated circuits. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1073/pnas.2531049123
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        Text: English
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      – SubjectFull: Van der Waals forces
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      – SubjectFull: Phonon-phonon interactions
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              Text: 3/3/2026
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              Y: 2026
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