Article
Nanoscience & Nanotechnology
Jing Zhou, Kunming Yang, Bihuan Yang, Boan Zhong, Songsong Yao, Youcao Ma, Jian Song, Tongxiang Fan, Dawei Tang, Jie Zhu, Yue Liu
Summary: Graphene has great potential for thermal management applications due to its high thermal conductivity. However, the low interface thermal conductance between graphene and metals limits its effective heat dissipation. In this study, the interfacial electron behaviors were investigated by comparing hydrogenation-treated graphene with pure graphene, and the effect of graphene layer numbers on the interfacial thermal conductance was systematically studied. The results showed that a larger interfacial thermal conductance can be obtained with lower layer numbers.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Jing Zhou, Kunming Yang, Bihuan Yang, Boan Zhong, Songsong Yao, Youcao Ma, Jian Song, Tongxiang Fan, Dawei Tang, Jie Zhu, Yue Liu
Summary: As a typical two-dimensional material, graphene has high in-plane thermal conductivity but low interface thermal conductance with metals, limiting its effectiveness in thermal management. This study investigates the interfacial electron behaviors between hydrogenation-treated graphene and nickel nanofilms. The results show that a larger interface thermal conductance can be obtained when the layer number is low, possibly reaching a peak value at a certain layer number.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Thermodynamics
Wuli Miao, Moran Wang
Summary: This study investigates thermal transport in metal/semiconductor multilayer films using the coupled electron and phonon Boltzmann transport equations combined with the phonon diffuse mismatch model. The importance of electron-phonon coupling transport and the critical thickness of the metal layer for considering this transport are demonstrated. The research findings provide insight into the manipulation of thermal conductivity in multilayers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Multidisciplinary Sciences
Qinshu Li, Fang Liu, Song Hu, Houfu Song, Susu Yang, Hailing Jiang, Tao Wang, Yee Kan Koh, Changying Zhao, Feiyu Kang, Junqiao Wu, Xiaokun Gu, Bo Sun, Xinqiang Wang
Summary: This study reveals that even for materials with similar Debye temperatures, a significant portion of phonons can transport inelastically across interfaces at high temperatures, greatly enhancing the interface thermal conductance. The sharpness of the interface strongly affects the phonon transport process. These findings provide new insights and opportunities for engineering interface thermal conductance in microelectronics materials.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Andrea Cepellotti, Jennifer Coulter, Anders Johansson, Natalya S. Fedorova, Boris Kozinsky
Summary: Understanding the electrical and thermal transport properties of materials is crucial for designing electronics, sensors, and energy conversion devices. This paper presents Phoebe, a software package that accurately predicts material properties by considering the effects of electron-phonon, phonon-phonon, boundary, and isotope scattering. Phoebe utilizes various methods and approximations to effectively compute electrical and thermal transport properties, making it a valuable tool for accelerated analysis of complex crystals.
JOURNAL OF PHYSICS-MATERIALS
(2022)
Review
Thermodynamics
Yujie Quan, Shengying Yue, Bolin Liao
Summary: Understanding the transport properties and scattering mechanisms of phonons is crucial for heat conduction in solids, while electron-phonon interactions have been found to have significant effects on phonon transport in a wide variety of technologically relevant solid-state materials. Electron-phonon interactions can modify the total phonon scattering rates and renormalize the phonon frequency under thermal equilibrium conditions, and affect the coupled transport of electrons and phonons in the bulk under nonequilibrium transport conditions.
NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Xin Liang, Hemeng Wang, Changan Wang
Summary: The study reveals a strong electron-phonon interaction in group IV and V transition metal carbides, leading to an anomalous weak temperature dependence of lattice thermal conductivity. It also shows that strong electron-phonon interaction can notably suppress lattice thermal transport without the necessity of Fermi surface nesting.
Article
Thermodynamics
Yixin Xu, Hongzhao Fan, Zhigang Li, Yanguang Zhou
Summary: Scatterings among heat carriers at metal/semiconductor heterojunctions play a crucial role in the heat dissipation process in quantum information science systems. In this study, we demonstrate that strong anharmonic phonon-phonon scatterings at the metal/semiconductor interface significantly enhance the thermal conductance, surpassing the harmonic limit. Our findings indicate that interfacial thermal transfer is dominated by extended vibrational modes, while electron-phonon coupling contributes negatively to the total interfacial thermal conductance. This research provides guidance for the thermal management design in quantum information electronics.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Xin Wu, Penghua Ying, Chunlei Li, Qiang Han
Summary: The wave-particle crossover of phonon transport in graphene/2D polyaniline lateral superlattices indicates a transition in the phonon transport mechanism from the incoherent to coherent regime. The thermal conductivity of the superlattice can be widely modulated due to the high structural similarity of polyaniline to graphene, surpassing other superlattices. The increase of interface density weakens thermal conductivity by increasing phonon-interface scattering while increasing it by lowering phonon transport barriers and allowing more long-wavelength phonons to participate in the transport.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Materials Science, Multidisciplinary
Sen Liu, Zheng Chang, Xiao-Liang Zhang, Kun-Peng Yuan, Yu-Fei Gao, Da-Wei Tang
Summary: In this work, the phonon thermal transport properties of three-dimensional (3D) and two-dimensional (2D) XB2 compounds were studied using first-principles calculations. The results showed that the thermal conductivities (TCs) of 3D MgB2 and 3D AlB2 decreased by 29% and 16% respectively after considering the electron-phonon interaction (EPI), which were consistent with experimental values. It was also found that the decrease in lattice TCs was mainly due to the decrease in phonon lifetime and heat capacity caused by the quantum confinement effect. Moreover, a correlation between quantum confinement effect and EPI was discovered.
Article
Physics, Condensed Matter
Kenta Hashimoto, Suguru Kitani, Hitoshi Kawaji
Summary: We investigated the thermal transport properties of Cu1-xZnxIr2S4 (0 < x < 0.3) and found an abrupt change in thermal conductivity during the metal-insulator transition. This is attributed to a significant decrease in the phonon thermal conductivity and mean free path, indicating the introduction of anomalous phonon scattering in the metallic phase.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Chemistry, Multidisciplinary
Chaopeng Zhao, Weishan Yan, Wangyang Zhang, Duo Liu
Summary: This study demonstrates that phonons can promote the relaxation of metastable centers in ZnO through the electron-phonon interaction. The findings provide valuable guidance for the development of novel quantum and photoactive devices.
Article
Chemistry, Multidisciplinary
Jingjing Wang, Ziyang Wang, Kunming Yang, Naiqi Chen, Jiamiao Ni, Jian Song, Quan Li, Fangyuan Sun, Yue Liu, Tongxiang Fan
Summary: Interfacial thermal resistance plays a critical role in heat dissipation. This study investigates the influence of interface defects on phonon scattering and finds that inelastic phonon scattering may greatly promote interfacial heat transport. The findings provide insights into nanoscale heat transport mechanisms at metal/nonmetal interfaces.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Thermodynamics
Chao Yang, Jian Wang, Dezhi Ma, Zhiqiang Li, Zhiyuan He, Linhua Liu, Zhiwei Fu, Jia-Yue Yang
Summary: Diamond substrate with superior thermal conductivity has been considered as a potential solution for heat dissipation in GaN-based power electronics. However, the effects of high concentration Ga/N atomic vacancies on phonon transport across the GaN-diamond interface remain largely unexplored. This study investigates the influence of vacancy-phonon scattering on the thermal resistance of the interface and provides guidance for improving the heat dissipation performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Nanoscience & Nanotechnology
Julia E. Greenwald, Joseph Cameron, Neil J. Findlay, Tianren Fu, Suman Gunasekaran, Peter J. Skabara, Latha Venkataraman
Summary: Researchers have successfully created a molecular system where the constructive quantum interference between certain molecular orbitals is suppressed, while the destructive interference between other molecular orbitals is enhanced, leading to highly nonlinear single-molecule circuits. They demonstrated the effectiveness of this strategy using fluorene oligomers containing a central benzothiadiazole unit, achieving a reproducible modulation of the conductance of a 6-nm molecule by more than 10,000 at room temperature.
NATURE NANOTECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Jiaxin Li, Ying Li, Pei-Chao Cao, Minghong Qi, Xu Zheng, Yu-Gui Peng, Baowen Li, Xue-Feng Zhu, Andrea Alu, Hongsheng Chen, Cheng-Wei Qiu
Summary: The reciprocity principle governs the symmetry in transmission of electromagnetic and acoustic waves, as well as the diffusion of heat. Recent interest in materials with time-modulated properties has shown efficient breaking of reciprocity for various forms of diffusion. However, time modulation may not be a viable approach to break thermal reciprocity. Our theoretical framework and experimental demonstration highlight the generally preserved nature of thermal reciprocity in dynamic materials.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Xin Zhu, Boyu Wang, Wan Xiong, Shuyao Zhou, Kai Qu, Jing-Tao Lu, Hongliang Chen, Chuancheng Jia, Xuefeng Guo
Summary: This study focuses on the significance of intermolecular charge transport in electronics and biochemical systems. By designing supramolecular dimer structures, the effects of charge state and energy level on charge transport under nanoconfinement are investigated. It is found that thermally-induced vibrations enhance incoherent tunneling in positively charged systems and the transition between coherent and incoherent tunneling is associated with specific molecular vibration modes.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Physics, Condensed Matter
Dengke Ma, Yuheng Xing, Lifa Zhang
Summary: This review focuses on the importance of heat dissipation and the decrease of interfacial thermal resistance (ITR) for integrated electronics and Li-ion battery-based devices. It discusses the widely used strategy of introducing interlayer to achieve this goal and the bonding effect and bridging effect as mechanisms to decrease ITR. Simulative and experimental studies are reviewed to explore the use of these effects in real materials and practical systems. The review also discusses the design rules and optimization of interlayers using machine learning algorithms, and proposes challenges and future directions in this field.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Hangbo Zhou, Gang Zhang, Jian-Sheng Wang, Yong-Wei Zhang
Summary: We investigate the anharmonic phonon scattering across a weakly interacting interface and find that the contribution from anharmonic three-phonon scatterings can be described by a temperature-dependent Landauer formula. Surprisingly, in the weak coupling limit, the transmission due to anharmonic phonon scattering increases indefinitely with temperature, which is not the case for two-phonon processes. We further reveal that anharmonic effects dominate over harmonic processes even at room temperature in real heterogeneous interfaces, emphasizing the importance of anharmonicity in weakly interacting systems.
Article
Chemistry, Multidisciplinary
Dingbo Zhang, Ke Wang, Shuai Chen, Lifa Zhang, Yuxiang Ni, Gang Zhang
Summary: Based on ab initio calculations and the phonon Boltzmann transport equation, this study found that magnetic phase transitions can significantly change the thermal conductivity of monolayer MnPS3. The study sheds light on the understanding of phonon thermal conductivity in 2D magnets and provides a practical method for the realization of 2D thermal switching devices. It has a broad range of novel applications including energy conversion and thermal management.
Editorial Material
Chemistry, Multidisciplinary
Baowen Li, Jianfang Wang, Tao Deng
Article
Chemistry, Multidisciplinary
Brendan McBennett, Albert Beardo, Emma E. Nelson, Begon Abad, Travis D. Frazer, Amitava Adak, Yuka Esashi, Baowen Li, Henry C. Kapteyn, Margaret M. Murnane, Joshua L. Knobloch
Summary: Nanostructuring allows control over heat flow in semiconductors, but bulk models are limited by boundary effects and first-principles calculations are computationally expensive. We use extreme ultraviolet beams to study phonon transport in a nanostructured silicon metalattice and observe reduced thermal conductivity. We develop a predictive theory that explains this behavior based on nanoscale confinement effects.
Review
Physics, Multidisciplinary
Jian-Sheng Wang, Jiebin Peng, Zu-Quan Zhang, Yong-Mei Zhang, Tao Zhu
Summary: This article discusses the description and modeling of transport phenomena in electron systems coupled via scalar or vector photons. It is divided into three parts: scalar photons (Coulomb interactions), transverse photons (described by vector potentials), and the phi = 0 or temporal gauge, which is a complete theory of electrodynamics. The nonequilibrium Green's function (NEGF) formalism is used as a tool to study steady-state transport, with the advantage of going beyond fluctuational electrodynamics (FE) due to its generality. Several examples are provided, including heat transfer between graphene sheets, light emission from a double quantum dot, and emission of energy, momentum, and angular momentum from a graphene nanoribbon. All calculations are based on a generalization of the Meir-Wingreen formula, with materials properties represented by photon self-energy and coupled with the Keldysh equation and the solution to the Dyson equation.
FRONTIERS OF PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Lei-Lei Nian, Bo Zheng, Jing-Tao Lue
Summary: We propose a scheme to achieve arbitrary photon statistics in a circuit quantum electrodynamics (cQED) system. By tuning inelastic electron tunneling processes, antibunched, bunched, superthermal, and coherent photon emissions can be achieved. The scheme also allows for the observation of quantum correlation between cavities and the transition from quantum to classical behavior.
Article
Materials Science, Multidisciplinary
Wen-Hao Mao, Man-Yu Shang, Jing-Tao Lue
Summary: We investigate the non-Hermitian collective dynamics of spatially separated edge carbon dimer vibrations in armchair graphene nanoribbons, which are mediated by coherent and dissipative coupling to nonequilibrium electron transport. We demonstrate that the indirect coupling between two dimers crucially depends on gating and source-drain bias. In particular, we analyze the competition between two distinct energy transfer mechanisms from nonequilibrium electrons to vibrations, namely deterministic work done by nonconservative current-induced force and stochastic Joule heating. Our findings suggest that armchair graphene nanoribbons could be promising candidates for experimental exploration of nonconservative current-induced forces in nanoconductors.
Article
Materials Science, Multidisciplinary
Shi-Ping Ding, Miao Liang, Zhen Ma, Jing-Tao Lu, Jin-Hua Gao
Summary: Due to the observed superconductivity in alternating twisted trilayer graphene, researchers have recently shown great interest in this material. By replacing one or several single-layered graphene in the trilayer structure with multilayer graphene, a double-twisted multilayer graphene is obtained. The researchers theoretically illustrate that if the double-twisted multilayer graphene possesses mirror symmetry along the z direction like the trilayer graphene, a mirror symmetry decomposition occurs, resulting in the exact decoupling of the system into two subsystems with opposite parity. This mirror symmetry decomposition provides a clear interpretation of the novel features in the moire band structures of the double-twisted multilayer graphene, and also predicts the existence of superconductivity in a specific configuration of the system.
Article
Materials Science, Multidisciplinary
Lei-Lei Nian, Shiqian Hu, Long Xiong, Jing-Tao Lu, Bo Zheng
Summary: A nonlinear QD-cQED setup is proposed to enhance photon-to-electron conversion by utilizing quantum phase transition. It is found that there is an increased energy transfer from photon to electron systems near the phase transition, leading to an enhancement in photocurrent.
Article
Materials Science, Multidisciplinary
Wen-Hao Mao, Man-Yu Shang, Jing-Tao Lu
Summary: This study investigates the nonequilibrium phonon distribution in graphene with the presence of electrical current using first-principles calculations and semiclassical transport theory. In addition to observing the hot-phonon effect, a cooling of phonon modes is also observed. Interestingly, the presence of electric current induces an opposite dipole-like temperature distribution in two valleys and at the gamma point, leading to valley polarization of phonon distribution between K and K'. Furthermore, the study examines the effect of nonequilibrium phonon distribution on lattice parameters and finds a negative current-induced expansion coefficient, which is similar to graphene's negative thermal expansion and is attributed to the dominant contribution of out-of-plane acoustic phonons.
Article
Materials Science, Multidisciplinary
Man-Yu Shang, Wen-Hao Mao, Nuo Yang, Baowen Li, Jing-Tao Lu
Summary: A unified theory for second sound in two-dimensional materials has been developed. The drifting and driftless second sound, previously studied, are two limiting cases of the theory. The presence of quadratic flexural phonons leads to the non-existence of drifting second sound in the thermodynamic limit, while the driftless mode is less affected. Tensile strain can increase the velocity of the drifting mode and also the velocity of the driftless mode.
Article
Optics
Zhongfei Xiong, Fan O. Wu, Jing-Tao Lu, Zhichao Ruan, Demetrios N. Christodoulides, Yuntian Chen
Summary: We propose a thermodynamic approach to guide light into the fundamental mode or highest-order mode in nonlinear multimode optical systems. By manipulating the temperature gradient and heat diffusion, we achieve an occupation rate of over 90% in a specific sandwich structure of optical waveguide lattices via supercooling or superheating.
