Magic angle in thermal conductivity of twisted bilayer graphene

Cheng, Yajuan; Fan, Zheyong; Zhang, Tao; Nomura, Masahiro; Volz, Sébastian; Zhu, Guimei; Li, Baowen; Xiong, Shiyun

doi:10.1016/j.mtphys.2023.101093

Cited by 27 publications

(14 citation statements)

References 48 publications

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“…This effect can be attributed to the weaker coupling between layers, which affects the flexural modes and thereby the LTC. This effect is also apparent in the larger in-plane LTC of graphene sheets compared to graphite. − …”

Section: Resultsmentioning

confidence: 98%

Tuning the Through-Plane Lattice Thermal Conductivity in van der Waals Structures through Rotational (Dis)ordering

Eriksson,

Fransson,

Linderälv

et al. 2023

ACS Nano

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It has recently been demonstrated that MoS 2 with irregular interlayer rotations can achieve an extreme anisotropy in the lattice thermal conductivity (LTC), which is, for example, of interest for applications in waste heat management in integrated circuits. Here, we show by atomic-scale simulations based on machine-learned potentials that this principle extends to other two-dimensional materials, including C and BN. In all three materials, introducing rotational disorder drives the through-plane LTC to the glass limit, while the in-plane LTC remains almost unchanged compared to those of the ideal bulk materials. We demonstrate that the ultralow through-plane LTC is connected to the collapse of their transverse acoustic modes in the through-plane direction. Furthermore, we find that the twist angle in periodic moiré structures representing rotational order provides an efficient means for tuning the through-plane LTC that operates for all chemistries considered here. The minimal through-plane LTC is obtained for angles between 1 and 4° depending on the material, with the biggest effect in MoS 2 . The angular dependence is correlated with the degree of stacking disorder in the materials, which in turn is connected to the slip surface. This provides a simple descriptor for predicting the optimal conditions at which the LTC is expected to become minimal.

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Section: Resultsmentioning

confidence: 98%

Tuning the Through-Plane Lattice Thermal Conductivity in van der Waals Structures through Rotational (Dis)ordering

Eriksson,

Fransson,

Linderälv

et al. 2023

ACS Nano

Self Cite

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“…S5 (ESI†). 51 The phonon mean free path (MFP) is an important reference for the modulation of thermal transport by nanostructuring. 52 We calculate the phonon MFP based on the results of phonon relaxation time and group velocity.…”

Section: Resultsmentioning

confidence: 99%

Thermal conductivity of sliding bilayer h-BN and its manipulation with strain and layer confinement

et al. 2023

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“…In the field of micro–nano device fabrication, 1 two-dimensional nanomaterials 2 such as graphene 3 and hexagonal boron nitride (h-BN) 4 have been gaining significant attention because of their extraordinary mechanical, 5–8 electrical, 9–12 and thermal characteristics. 13–28 Particularly, these materials show broad application prospects when they form vertically stacked van der Waals heterostructures 29 or planar heterostructures. 30–32 The graphene/h-BN heterostructure possesses exceptional thermal transport properties, making it a promising candidate for various applications such as thermal rectifiers, 33,34 thermal transistors, 35,36 thermal diode circuits 37 and thermal memory devices.…”

Section: Introductionmentioning

confidence: 99%

Unexpected reduction in thermal conductivity observed in graphene/h-BN heterostructures

Wu,

Liu,

Wei

et al. 2024

Phys. Chem. Chem. Phys.

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Magic angle in thermal conductivity of twisted bilayer graphene

Cited by 27 publications

References 48 publications

Tuning the Through-Plane Lattice Thermal Conductivity in van der Waals Structures through Rotational (Dis)ordering

Tuning the Through-Plane Lattice Thermal Conductivity in van der Waals Structures through Rotational (Dis)ordering

Thermal conductivity of sliding bilayer h-BN and its manipulation with strain and layer confinement

Unexpected reduction in thermal conductivity observed in graphene/h-BN heterostructures

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