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Van Hove Singularity Modulation of Phonon Transport in Twisted Bilayer Graphene
Tsinghua Univ, Dept Mech Engn, State Key Lab Tribol Adv Equipment, Beijing 100084, Peoples R China..
Tsinghua Univ, Dept Mech Engn, State Key Lab Tribol Adv Equipment, Beijing 100084, Peoples R China..
KTH, School of Engineering Sciences (SCI), Engineering Mechanics. Tsinghua Univ, Dept Mech Engn, State Key Lab Tribol Adv Equipment, Beijing 100084, Peoples R China.ORCID iD: 0000-0002-7547-6535
Tsinghua Univ, Dept Mech Engn, State Key Lab Tribol Adv Equipment, Beijing 100084, Peoples R China..
2023 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 127, no 49, p. 23752-23759Article in journal (Refereed) Published
Abstract [en]

Twisted bilayer graphene (tBLG) exhibits remarkable optical and electrical properties, rendering it a promising material for future micro/nano devices. Nonetheless, efficient heat transport poses a critical challenge, and comprehending the influence of the twist angle on phonon properties is vital. In this study, we present the first analysis of the effects of the twist angle on phonon scattering near the Van Hove singularity. Our investigation reveals an extended lifetime of the G mode phonon due to electron-hole pair excitation near the critical angle accompanied by a substantial enhancement response. This phenomenon occurs when electron-phonon scattering is suppressed, leading to the dominance of phonon-phonon scattering in the transport process. Our study unveils the predominant control of the phonon-phonon scattering process by three-phonon scattering with the proportion directly influenced by the twist angle. This effect arises from the alteration in the phonon band structure, aligning with theoretical predictions acquired via molecular dynamics simulations. These findings contribute significant scientific insights into the phonon scattering behavior of tBLG, thereby informing the development of advanced micro/nano devices with enhanced performance. Furthermore, our study may open avenues for investigating the potential practical applications of tBLG and other twisted materials.

Place, publisher, year, edition, pages
American Chemical Society (ACS) , 2023. Vol. 127, no 49, p. 23752-23759
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-342855DOI: 10.1021/acs.jpcc.3c05942ISI: 001143014700001Scopus ID: 2-s2.0-85179606055OAI: oai:DiVA.org:kth-342855DiVA, id: diva2:1833591
Note

QC 20240201

Available from: 2024-02-01 Created: 2024-02-01 Last updated: 2024-02-01Bibliographically approved

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Liu, Zibo

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