Magic angle in thermal conductivity of twisted bilayer graphene

Bibliographic Details
Title:	Magic angle in thermal conductivity of twisted bilayer graphene
Authors:	Cheng, Yajuan, Fan, Zheyong, Zhang, Tao, Nomura, Masahiro, Volz, Sebastian, Zhu, Guimei, Li, Baowen, Xiong, Shiyun
Source:	Materials Today Physics, 35 (2023) 101093
Publication Year:	2022
Collection:	Condensed Matter
Subject Terms:	Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
More Details:	We report a local minimum in thermal conductivity in twisted bilayer graphene (TBG) at the angle of 1.08$^\circ$, which corresponds to the 'magic angle' in the transition of several other reported properties. Within the supercell of a moir\'e lattice, different stacking modes generate phonon scattering sites which reduce the thermal conductivity of TBG. The thermal magic angle arises from the competition between the delocalization of atomic vibrational amplitudes and stresses on one hand, and the increased AA stacking density on the other hand. The former effect weakens the scattering strength of a single scatterer while the latter one increases the density of scatterers. The combination of these two effects eventually leads to the apparition of the highlighted irregularity in heat conduction. The manifestation of a magic angle, disclosing new thermal mechanisms at nanoscale, further uncovers the unique physics of two-dimensional materials. Comment: 15 pages, 5 figures
Document Type:	Working Paper
DOI:	10.1016/j.mtphys.2023.101093
Access URL:	http://arxiv.org/abs/2301.00323
Accession Number:	edsarx.2301.00323
Database:	arXiv

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Items	– Name: Title Label: Title Group: Ti Data: Magic angle in thermal conductivity of twisted bilayer graphene – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Cheng%2C+Yajuan%22">Cheng, Yajuan</searchLink><br /><searchLink fieldCode="AR" term="%22Fan%2C+Zheyong%22">Fan, Zheyong</searchLink><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Tao%22">Zhang, Tao</searchLink><br /><searchLink fieldCode="AR" term="%22Nomura%2C+Masahiro%22">Nomura, Masahiro</searchLink><br /><searchLink fieldCode="AR" term="%22Volz%2C+Sebastian%22">Volz, Sebastian</searchLink><br /><searchLink fieldCode="AR" term="%22Zhu%2C+Guimei%22">Zhu, Guimei</searchLink><br /><searchLink fieldCode="AR" term="%22Li%2C+Baowen%22">Li, Baowen</searchLink><br /><searchLink fieldCode="AR" term="%22Xiong%2C+Shiyun%22">Xiong, Shiyun</searchLink> – Name: TitleSource Label: Source Group: Src Data: Materials Today Physics, 35 (2023) 101093 – Name: DatePubCY Label: Publication Year Group: Date Data: 2022 – Name: Subset Label: Collection Group: HoldingsInfo Data: Condensed Matter – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Condensed+Matter+-+Mesoscale+and+Nanoscale+Physics%22">Condensed Matter - Mesoscale and Nanoscale Physics</searchLink><br /><searchLink fieldCode="DE" term="%22Condensed+Matter+-+Materials+Science%22">Condensed Matter - Materials Science</searchLink> – Name: Abstract Label: Description Group: Ab Data: We report a local minimum in thermal conductivity in twisted bilayer graphene (TBG) at the angle of 1.08$^\circ$, which corresponds to the 'magic angle' in the transition of several other reported properties. Within the supercell of a moir\'e lattice, different stacking modes generate phonon scattering sites which reduce the thermal conductivity of TBG. The thermal magic angle arises from the competition between the delocalization of atomic vibrational amplitudes and stresses on one hand, and the increased AA stacking density on the other hand. The former effect weakens the scattering strength of a single scatterer while the latter one increases the density of scatterers. The combination of these two effects eventually leads to the apparition of the highlighted irregularity in heat conduction. The manifestation of a magic angle, disclosing new thermal mechanisms at nanoscale, further uncovers the unique physics of two-dimensional materials.<br />Comment: 15 pages, 5 figures – Name: TypeDocument Label: Document Type Group: TypDoc Data: Working Paper – Name: DOI Label: DOI Group: ID Data: 10.1016/j.mtphys.2023.101093 – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="http://arxiv.org/abs/2301.00323" linkWindow="_blank">http://arxiv.org/abs/2301.00323</link> – Name: AN Label: Accession Number Group: ID Data: edsarx.2301.00323
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RecordInfo	BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.mtphys.2023.101093 Subjects: – SubjectFull: Condensed Matter - Mesoscale and Nanoscale Physics Type: general – SubjectFull: Condensed Matter - Materials Science Type: general Titles: – TitleFull: Magic angle in thermal conductivity of twisted bilayer graphene Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Cheng, Yajuan – PersonEntity: Name: NameFull: Fan, Zheyong – PersonEntity: Name: NameFull: Zhang, Tao – PersonEntity: Name: NameFull: Nomura, Masahiro – PersonEntity: Name: NameFull: Volz, Sebastian – PersonEntity: Name: NameFull: Zhu, Guimei – PersonEntity: Name: NameFull: Li, Baowen – PersonEntity: Name: NameFull: Xiong, Shiyun IsPartOfRelationships: – BibEntity: Dates: – D: 31 M: 12 Type: published Y: 2022
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