Related references
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Article
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Kai Ren et al.
Summary: This work reports on the interfacial thermal conduction (ITC) behavior in 2D heterostructures constructed using MoSSe and WSSe. It was found that the ITC in the normally connected heterostructure is almost twice as much as that in the inversely connected heterostructure. This unusual change in ITC is attributed to the bending curvature and additional discontinuity in the inversely connected heterostructure.
ADVANCED FUNCTIONAL MATERIALS
(2022)
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Summary: By using moire patterns in van der Waals materials, we have successfully achieved a topological superconducting state. The magnetic moire pattern gives rise to Yu-Shiba-Rusinov minibands and periodic modulation of the Majorana edge modes.
Article
Chemistry, Physical
Yan Yin et al.
Summary: The study reveals that the bilayer beta(12) borophene, a new member of two-dimensional materials, exhibits significantly higher in-plane thermal conductivity compared to its monolayer counterpart. This abnormal enhancement is attributed to the suppressed phonon scattering possibility and elongation of phonon lifetime after forming the bilayer through interlayer covalent bonding. Furthermore, the dominated phonon branch to thermal conductivity was found to change to transverse acoustic phonons from out-of-plane flexural acoustic phonons in the monolayer borophene.
Article
Chemistry, Physical
Jia He et al.
Summary: The study shows that fluorination and chlorination can stabilize alpha'-borophene and maintain its semiconductor nature. When hydrogen is replaced with fluorine or chlorine, a significant reduction in thermal conductivity is observed, attributed to the weakening of B-B bonds and softening of phonon modes. As a result, chlorinated alpha'-borophene exhibits a high thermoelectric figure of merit along the armchair direction at 300 K.
Article
Nanoscience & Nanotechnology
Xiaoyi Peng et al.
Summary: This study investigates the effect of interfacial superlattice structures on the Kapitza resistance between a graphene/water interface through molecular dynamics simulations. The results show that introducing interfacial superlattices can significantly reduce the Kapitza resistance. The analysis suggests that this improvement is mainly due to the enhanced phonon scattering rate in the interfacial graphene layer, which increases the thermal resistance between the graphene layer and its neighboring layer.
Article
Chemistry, Physical
Wei-Min Zhao et al.
Summary: The study reveals that moire patterns formed at specific twist angles can trap charge density wave (CDW) states, which persist at room temperature, indicating potential applications in CDW-based technologies.
Article
Physics, Multidisciplinary
Hongchao Xie et al.
Summary: This study demonstrates successful twist engineering of 2D magnetism by fabricating twisted double bilayers of a 2D magnet, chromium triiodide (CrI3). It identifies a new magnetic ground state that differs from natural two-layer and four-layer CrI3 structures, and shows that the emergent magnetism for small and large twist angles resemble different configurations, while an intermediate twist angle introduces net magnetization due to spin frustrations.
Article
Physics, Multidisciplinary
Zhongwei Zhang et al.
Summary: Understanding and quantifying the coherence of thermal excitations is an important problem in physics. The traditional phonon gas model fails to capture this coherence. In this study, a new heat conduction formalism is proposed that combines the phonon gas model and the wave nature of thermal phonons. The theory and simulations reveal two types of coherence in different temperature ranges.
PHYSICAL REVIEW LETTERS
(2022)
Article
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Cheng Hu et al.
Summary: This study demonstrates the construction of in-situ twistable bilayer graphene, which allows for the continuous and precise tuning of the twist angle. The controlled tuning is confirmed by various characterizations, and the developed devices enable systematic investigation of the twist angle effects in a single device, thus advancing twistronics research.
SCIENTIFIC REPORTS
(2022)
Article
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Cuiqian Yu et al.
Summary: Recently, the important role of high-order anharmonic phonon-phonon interactions has been revealed in several materials. By solving the Boltzmann transport equation, the significant impact of four-phonon scattering on thermal transport in honeycomb structured monolayer BAs and its hydrogenated bilayer counterparts has been shown. After considering four-phonon scattering, the lattice thermal conductivity of all these structures is reduced, especially for monolayer BAs, which shows a huge drop of 80% mainly due to the suppression of phonon lifetimes. In contrast to graphene, the thermal conductivity of monolayer BAs is abnormally lower than its bilayer counterparts, attributed to the much larger phonon scattering rate. The contribution of flexural acoustic phonon exhibits the most significant reduction in both monolayer and bilayer BAs with horizontal mirror symmetry after including four-phonon scattering.
APPLIED PHYSICS LETTERS
(2022)
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Mengzhou Liao et al.
Summary: MoS2/graphite and MoS2/h-BN interfaces exhibit ultra-low friction coefficients, with edges and interface steps being the main contributors to friction forces; two-dimensional heterostructures offer twist-angle-independent ultra-low friction due to weak interlayer van der Waals interactions and natural lattice mismatch, but the effects of domain edges on friction processes in finite-size interfaces remain unclear.
Review
Physics, Multidisciplinary
Jie Chen et al.
Summary: Interfacial thermal resistance (ITR) is a major obstacle for heat transfer between materials, and understanding it is crucial for efficient heat dissipation in electronic and photonic devices, batteries, etc. This comprehensive review examines ITR, focusing on theoretical, computational, and experimental developments over the past 30 years. It covers fundamental theories, computational methods, and experimental tools for probing ITR, as well as challenges and opportunities in studying nanoscale and atomic scale interfaces.
REVIEWS OF MODERN PHYSICS
(2022)
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Yinong Liu et al.
Summary: Efforts have been made to control phonon transport through introducing disorder, while materials informatics has shown accurate prediction ability in studying new materials. However, expanding the design space with disorder makes global optimization nearly impossible. This study investigates the effect of different types of disorders on phonon transport in a two-dimensional heterostructure and finds that introducing disorder significantly reduces thermal conductivity.
FRONTIERS IN MATERIALS
(2022)
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Miao-Ling Lin et al.
Summary: The Moir?? pattern in twisted multilayers induces various emergent phenomena, and the patterned interfacial coupling plays a crucial role in these systems. This study determines the quantitative relationship between the lattice dynamics of out-of-plane optical phonons and patterned interfacial coupling in multilayer graphene Moir?? superlattices using a proposed perturbation model, revealing the modulation effects on phonon frequency and wavefunction.
Article
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Cuiqian Yu et al.
Summary: The study demonstrates that specific structural configurations and mechanism designs in multilayer structures can significantly enhance thermal transport, including the influence of coherent and incoherent phonon transport synergistic effects. Tuning the wave-particle duality of phonons can improve effective thermal conductivity, providing a new approach for enhancing thermal management in devices with densely packed interfaces.
FRONTIERS OF PHYSICS
(2022)
Article
Thermodynamics
Xianhua Nie et al.
Summary: This study investigates the effects of twist angles on the lattice thermal conductivity of molybdenum disulfide in twisted bilayer and trilayer configurations. The results show that in the twisted bilayer sample, the thermal conductivity exhibits a W-shaped relationship with the twist angle, and the minimum thermal conductivity is achieved at a twist angle of 15 degrees. For the twisted trilayer sample, the minimum thermal conductivity is obtained when the sum of the two twist angles is an odd multiple of 15 degrees. These findings provide valuable insights for the design of thermoelectric materials.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Review
Physics, Multidisciplinary
Jie Chen et al.
Summary: This review article presents the recent advances in emerging phonon phenomena, including the wave nature and particle nature of phonons. The article summarizes the effects of phonon coherence on thermal conductivity and the topological properties of phonons, as well as the weak coupling and high-order anharmonicity of phonons. Additionally, the article provides a brief outlook for future research directions.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
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Qiang Gao et al.
Summary: Lattice dynamics plays a crucial role in the physics of moire systems, and this study elucidates the origin and properties of moire phonons by identifying the mismatch symmetry for different twist angles. Furthermore, the analysis is generalized to twisted multilayer graphene, identifying higher-order mismatches and counting the number of gapless modes.
Article
Materials Science, Multidisciplinary
Shuang Lu et al.
Summary: Introduced the importance of crystal symmetry in thermal transport in solids, focusing on the case of inversion symmetry breaking in monolayer Ta2CS2 that abnormally enhances lattice thermal conductivity in 2D functionalized MXenes.
Article
Materials Science, Multidisciplinary
Yulou Ouyang et al.
Summary: In this study, the machine learning potential (MLP) and molecular dynamics simulations were used to predict the thermal conductivity (kappa) and assess the effect of anharmonicity on thermal transport properties of cubic boron arsenide (BAs) and diamond. The MLP based on the matrix tensor algorithm accurately described the lattice dynamics behaviors in both materials. The phonon spectral energy density analysis showed that MLP effectively captured the anharmonicity-induced phonon mode softening and linewidth broadening. Results demonstrated that the accuracy of MLP in predicting kappa was comparable to that of density-functional theory calculations for diamond and BAs. However, high-order phonon scattering process had a significant impact on BAs, leading to the overestimation of kappa compared to experimental results. Equilibrium molecular dynamics simulations combined with MLP provided accurate predictions of kappa for both BAs and diamond. The study suggested that molecular dynamics simulation combined with MLP is a reliable and computationally efficient tool for predicting material's thermal conductivity.
Review
Materials Science, Multidisciplinary
Sanjay K. Behura et al.
Summary: Artificial moire superlattices created by vertically stacking and rotating two monolayers of 2D materials exhibit a moire pattern that controls interlayer hybridization and gives rise to various quantum phenomena. Notable advances include flat bands, exciton superlattices, and interlayer magnetism in twisted bilayer heterostructures of 2D crystals. This field of moire physics in twisted van der Waals heterostructures shows promise for applications in quantum nanoelectronics, optoelectronics, and quantum computing.
EMERGENT MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Wenyu Yuan et al.
Summary: Our study demonstrates that interfacial engineering is an efficient strategy to tune thermal transport, and the vertically stacked MoSe2-MoS2-MoSe2-MoS2 heterostructure shows the lowest thermal conductance. The roles of various interfacial effects on heat flow are revealed, highlighting the importance of interfacial mismatch and coupling effects in thermal transport. The design principle also has promising applications in other areas such as electrical and thermoelectric tuning.
Article
Chemistry, Physical
Lishu Wu et al.
Summary: In twisted WS2/MoS2 heterostructures, the shifts and linewidths of E-2g(Gamma) and A(1g)(Gamma) phonon modes are found to be twist angle dependent, primarily due to spacing-related repulsion between sulfur atoms. Additionally, opposite shift behaviors and broadening of A(1g)(Gamma) modes caused by charge transfer are also observed in the twisted heterostructures. The understanding and controlling of interlayer interaction through the stacking orientation are crucial for the future design of optoelectronic devices based on 2D heterostructures.
Review
Chemistry, Multidisciplinary
Le Cai et al.
Summary: Twisted bilayer graphene (tBLG) exhibits innovative physical phenomena due to the formation of a moiré superlattice, with the discovery of superconducting behavior sparking new interest in graphene. The focus of research is on the physical properties, and high-quality tBLG fabrication is essential for achieving desired properties. Various fabrication methods and characterization techniques have been analyzed, highlighting the unique physicochemical properties and potential applications of tBLG.
ADVANCED MATERIALS
(2021)
Article
Multidisciplinary Sciences
Shi En Kim et al.
Summary: This study reports extremely anisotropic thermal conductors based on large-area van der Waals thin films with random interlayer rotations, achieving high thermal conductivity ratios.
Article
Chemistry, Multidisciplinary
Weijun Ren et al.
Summary: This study explores the influence of interlayer rotation angle theta on interfacial thermal transport across graphene/h-BN heterostructure using molecular dynamics simulation. The thermal conductance at the interface decreases with increasing rotation angle, mainly due to the reduction in low-frequency phonon contribution. Rotation enhances surface fluctuation in the graphene layer, leading to a rotation angle-dependent thermal conductance.
Article
Multidisciplinary Sciences
Andreij C. Gadelha et al.
Summary: The twisted bilayer graphene undergoes self-organized lattice reconstruction, resulting in the formation of a superlattice that modulates vibrational and electronic structures, leading to phenomena such as strong correlations and superconductivity. Although experimental techniques and theoretical models face challenges in observing and describing these effects, nano-Raman spectroscopy can localize some vibrational modes and provide insights into the effects of electron-phonon coupling on the material properties.
Review
Physics, Multidisciplinary
Yulou Ouyang et al.
Summary: Traditional simulation methods have made progress in studying thermal transport properties of materials, but also face challenges such as high computational costs. Machine learning, as an emerging computational method, has the potential to accelerate research and provide new perspectives.
FRONTIERS OF PHYSICS
(2021)
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Physics, Applied
Yu-Jia Zeng et al.
Summary: Investigated the evolution of phonon structures in twisted bilayer and multilayer two-dimensional materials under out-of-plane strain and twisting, revealing different phonon behaviors and a potential method to enhance phonon anharmonic scattering in stacked multilayer graphene.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Shuo Han et al.
Summary: This study experimentally investigates the thermal conductivity of single-crystalline bilayer graphene as a function of interlayer twist angle and temperature. The results show that a slight twist angle can lead to a significant decrease in thermal conductivity. The study reveals the sensitivity of thermal conduction to the twist angle, providing insights into thermal transport in van der Waals bilayer systems.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Jiamin Quan et al.
Summary: The phonon spectra in MoS2 twisted bilayers are renormalized due to ultra-strong coupling between different phonon modes and atomic reconstructions of the moire pattern, providing new insights into moire physics. A low-energy continuum model for phonons has been developed to successfully capture experimental observations and reveal the rapid evolution of phonon spectra over a range of small twist angles. Remarkably, simple optical spectroscopy experiments can offer information on strain and lattice distortions in nanometre-size moire crystals.
Article
Materials Science, Multidisciplinary
Philipp Parzefall et al.
Summary: The study investigated twisted MoSe2 homo- and MoSe2-WSe2 heterobilayers using low-frequency Raman spectroscopy and low-temperature micro photoluminescence, revealing moiré phonons and their relationship to twist angles. By analyzing the moiré phonons in heterobilayers, relative twist angles can be determined with higher precision, and the correlation between interlayer-exciton signals and twist angles was discussed.
Article
Chemistry, Multidisciplinary
Duan Luo et al.
Summary: The study utilized ultrafast electron diffraction to simultaneously visualize charge transfer and electron-phonon coupling in MoS2-graphene heterostructures. It was found that the timescale of charge transfer and relaxation varies significantly with twist angle, indicating that twist angle can serve as an additional tuning knob for interlayer charge transfer in heterobilayers. The research deepened the understanding of fundamental photophysical processes in heterostructures, which is important for future applications in optoelectronics and light harvesting.
Article
Multidisciplinary Sciences
Yuan Cao et al.
Summary: The study of magic-angle twisted trilayer graphene has revealed unexpectedly strong superconductivity, surpassing the conventional Pauli limit. The results suggest that external magnetic fields can induce transitions between phases with potentially different order parameters.
Article
Materials Science, Multidisciplinary
Yufeng Zhang et al.
Summary: The emergence of twistronics provides a novel platform to modulate band structures, while the concept of phonon engineering is still lacking. By extending 'twistnonics' to 2D puckered materials, a 'phonon magic angle' has been discovered through molecular dynamics simulation. This novel phenomenon is attributed to confined vdW potential energy and weak phonon anharmonicity in perfectly arranged lattice structures, which can effectively regulate both in-plane and out-of-plane thermal transport properties.
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Summary: Direct atomic simulations reveal a thermally activated phonon mode with a large population of elastic wave packets, characterized by a wide distribution of lifetimes and coherence times. A generalized law for phonon number decay accounting for coherent effects was derived, introducing a delay proportional to the square of the coherence time before the conventional exponential decay due to phonon-phonon scattering. This additional regime leads to a moderate increase in relaxation times and a different dependence of phonon relaxation.
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Yu-Chen Leng et al.
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