Article
Materials Science, Multidisciplinary
Yingru Song, Geoff Wehmeyer
Summary: Phonon ray tracing calculations have been used to quantify phonon boundary scattering in nanomaterials and to interpret thermal conductivity measurements. However, Landauer-based phonon ray tracing methods have not been able to access the temperature or heat flux profiles within nanomaterials, meaning that computationally intensive Boltzmann Transport Equation solvers are needed. We derive and apply phonon Monte Carlo ray tracing methods to calculate the local temperature and heat flux in semiconducting nanomaterials, focusing on the ballistic transport regime.
MATERIALS TODAY PHYSICS
(2023)
Article
Thermodynamics
Chuang Zhang, Songze Chen, Zhaoli Guo
Summary: Heat conduction in solid materials can exhibit fluid dynamics behavior when normal scattering dominates phonon transport, leading to the prediction of heat vortices with frequency-independent relaxation time in the hydrodynamic regime. This phenomenon can also appear in other regimes such as the ballistic regime, with differences in vortex sizes and critical values observed. The study provides insights into the wider window of heat vortices in different regimes and their characteristics in different material structures.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Physics, Applied
Sevil Sarikurt, Yusuf Zuntu Abdullahi, Engin Durgun, Fatih Ersan
Summary: This study investigates the thermal expansion coefficients of group III-Nitride monolayers with temperature, revealing high negative values below room temperature and a convergence to zero for certain monolayers above room temperature. The highest contribution to negative thermal expansion comes from the ZA phonon mode. These findings are important for the design of nanoscale heat devices.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Thermodynamics
Chuang Zhang, Zhaoli Guo
Summary: This study investigates transient heat propagation in a homogeneous thermal system using the phonon Boltzmann transport equation under the Callaway model. Results show that in quasi-two (three) dimensional simulations, the transient temperature can be lower than the initial temperature in the hydrodynamic regime within a certain time and space range. This phenomenon only occurs when normal scattering dominates heat conduction and distinguishes hydrodynamic phonon transport from (quasi) ballistic phonon transport.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Physics, Multidisciplinary
Theodore Maranets, Yan Wang
Summary: In this work, the authors investigate the scattering behavior of a ballistic phonon wave on a dopant nanoparticle and a dopant thin slab in a pure crystal. They find that the non-planar interfaces of the nanoparticle lead to a 'phonon lensing' effect, altering the wave propagation and resulting in mode-conversion. This phenomenon is absent in the thin slab, leading to differences in the scattering behaviors between planar and non-planar interfaces.
NEW JOURNAL OF PHYSICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Giuseppe Romano, Steven G. Johnson
Summary: In this study, a methodology for density-based topology optimization of non-Fourier thermal transport in nanostructures is introduced. It utilizes adjoint-based sensitivity analysis of the phonon Boltzmann transport equation (BTE) and a novel material interpolation technique called the transmission interpolation model (TIM). The approach is able to handle the interplay between real- and momentum-resolved material properties by parameterizing the material density with an interfacial transmission coefficient. This methodology allows for the systematic optimization of materials for heat management and conversion, as well as the design of devices where diffusive transport is not valid.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2022)
Article
Physics, Applied
Osbel Almora, Daniel Miravet, Marise Garcia-Batlle, Germa Garcia-Belmonte
Summary: The article discusses the dark current-voltage characteristics of halide perovskite materials and the different regimes of space-charge limited current, introducing models of quasi-ballistic velocity-dependent dissipation and ballistic-like voltage-dependent mobility to better describe electronic and ionic kinetics in halide perovskites.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Zhonghua Yang, Kunpeng Yuan, Nan Li, Xiaoliang Zhang, Ming Hu
Summary: Phonon hydrodynamics can efficiently flow in low-dimensional materials at room temperature. Our study reveals the manipulation of phonon hydrodynamics in layered ferroelectric materials using an external electric field, which can contribute up to 50% of the overall thermal transport.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Yidan Cao, Sophie Hans, Julia Liese, Ulrike Werner-Zwanziger, Jun Wang, J. Craig Bennett, R. A. Dunlap, M. N. Obrovac
Summary: Si(CO)(y) alloys were synthesized by reactive gas milling silicon in CO2 at room temperature, forming Si nanograins dispersed in an amorphous Si-O-C matrix. The capacity behavior suggests the formation of inactive SiC and Li4SiO4 during the first lithiation, leading to significantly greater initial coulombic efficiency (ICE) compared to SiOx.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Vaishali Taneja, Subarna Das, Kapildeb Dolui, Tanmoy Ghosh, Animesh Bhui, Usha Bhat, Dinesh Kumar Kedia, Koushik Pal, Ranjan Datta, Kanishka Biswas
Summary: This study demonstrates the PGEC-like behavior of AgSbTe2 by tuning atomic disorder through Yb doping, resulting in outstanding thermoelectric performance. Enhanced atomic ordering induced by doping decreases the overlap between hole and phonon mean free paths, leading to PGEC-like transport behavior. The formation of cation-ordered domains scatters heat-carrying phonons, resulting in a temperature-independent glass-like thermal conductivity. This strategy paves the way for achieving high thermoelectric performance in various disordered crystals.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Yi Tao, Shuang Cai, Chao Wu, Zhiyong Wei, Xi Lu, Yan Zhang, Yunfei Chen
Summary: Phonon transport in van der Waals materials exhibits strong anisotropic and size-dependent properties, especially for van der Waals nanowires. A phenomenological model has been proposed to describe the anisotropic phonon transport behavior, which deviates from classical predictions when the structure size is small.
Article
Instruments & Instrumentation
Jianli Wang, Lu Chen, Cong Wang, Chengkun Mao, Hongmei Yu, Zhenyu Cui
Summary: A homemade inelastic tunneling spectroscope was used to investigate the electrical and thermal resistances of nanosized metallic contacts established by Lorentz force pressing two wires crosswise in a magnetic field. The study found that the thermal contact resistance increases linearly with the electrical counterpart, indicating the validity of the Wiedemann-Franz law at clean metallic contacts.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Materials Science, Multidisciplinary
Ioannis Leontis, Gabriela Augusta Prando, Konstantinos Andreas Anastasiou, Agnes Bacon, Monica Felicia Craciun, Saverio Russo
Summary: Ballistic graphene p-n junctions (GPNJs) are fabricated using physisorbed Zn adatoms, allowing for low-cost and scalable production of electrical counterparts to optical circuits. Spatially resolved Raman spectroscopy through a quartz transparent substrate accurately maps charge doping and strain in the graphene/Zn interface and beneath the metal layer. Electrical measurements and modeling confirm the ballistic nature of charge transport up to room temperature.
Article
Nanoscience & Nanotechnology
Nilesh Kumar, Rajneesh Chaurasiya, Ambesh Dixit
Summary: The thermodynamic stability, electronic properties, and optical properties of III-nitride monolayers under strain are investigated using phonon band structure calculations. The results show that these monolayers are more sensitive to compressive strain and exhibit higher tensile strain tolerance.
Article
Materials Science, Multidisciplinary
Lanting Feng, Zhe Liu, Mingfeng Zhu, Yisong Zheng
Summary: The conductivity of ABA-stacked trilayer graphene is smaller than that of monolayer graphene due to strong interband scattering. This is despite the fact that the trilayer graphene has an additional parabolic dispersion band.
Article
Chemistry, Multidisciplinary
Lin Zhou, Kai Xu, Ahmad Zubair, Xu Zhang, Fangping Ouyang, Tomas Palacios, Mildred S. Dresselhaus, Yongfeng Li, Jing Kong
ADVANCED FUNCTIONAL MATERIALS
(2017)
Article
Chemistry, Multidisciplinary
Jin-Yong Hong, Yong Cheol Shin, Ahmad Zubair, Yunwei Mao, Tomas Palacios, Mildred S. Dresselhaus, Sung Hyun Kim, Jing Kong
ADVANCED MATERIALS
(2016)
Article
Chemistry, Analytical
Charles Mackin, Tomas Palacios
Article
Physics, Applied
Haowen Hou, Zhihong Liu, Jinghua Teng, Tomas Palacios, Soo-Jin Chua
APPLIED PHYSICS EXPRESS
(2017)
Article
Physics, Applied
S. Joglekar, M. Azize, M. Beeler, E. Monroy, T. Palacios
APPLIED PHYSICS LETTERS
(2016)
Article
Engineering, Electrical & Electronic
Puneet Srivastava, SungWon Chung, Daniel Piedra, Hae-Seung Lee, Tomas Palacios
IEEE ELECTRON DEVICE LETTERS
(2016)
Article
Engineering, Electrical & Electronic
Yuhao Zhang, Koon Hoo Teo, Tomas Palacios
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2016)
Article
Engineering, Electrical & Electronic
Sameer Joglekar, Mohamed Azize, Eric J. Jones, Daniel Piedra, Silvija Gradecak, Tomas Palacios
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2016)
Article
Engineering, Manufacturing
Sameer Joglekar, Chuanxin Lian, Rajesh Baskaran, Yan Zhang, Tomas Palacios, Allen Hanson
IEEE TRANSACTIONS ON SEMICONDUCTOR MANUFACTURING
(2016)
Article
Chemistry, Multidisciplinary
Lili Yu, Dina El-Damak, Ujwal Radhakrishna, Xi Ling, Ahmad Zubair, Yuxuan Lin, Yuhao Zhang, Meng-Hsi Chuang, Yi-Hsien Lee, Dimitri Antoniadis, Jing Kong, Anantha Chandrakasan, Tomas Palacios
Article
Engineering, Electrical & Electronic
Yuhao Zhang, Daniel Piedra, Min Sun, Jonas Hennig, Armin Dadgar, Lili Yu, Tomas Palacios
IEEE ELECTRON DEVICE LETTERS
(2017)
Article
Multidisciplinary Sciences
Alberto Bosca, Jorge Pedros, Javier Martinez, Tomas Palacios, Fernando Calle
SCIENTIFIC REPORTS
(2016)
Article
Chemistry, Multidisciplinary
Amanuel M. Berhane, Kwang-Yong Jeong, Zoltan Bodrog, Saskia Fiedler, Tim Schroder, Noelia Vico Trivino, Tomas Palacios, Adam Gali, Milos Toth, Dirk Englund, Igor Aharonovich
ADVANCED MATERIALS
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
E. A. Fitzgerald, K. E. Lee, L. Zhang, C. C. Huang, A. Kadir, S. Bao, Z. Ren, C. Wang, Y. Wang, K. H. Lee, Z. H. Liu, T. Palacios, C. S. Tan, G. I. Ng, S. J. Chua
GALLIUM NITRIDE AND SILICON CARBIDE POWER TECHNOLOGIES 6
(2016)
Proceedings Paper
Engineering, Multidisciplinary
Weichuan Xing, Zhihong Liu, Geok Ing Ng, Tomas Palacios
INTERNATIONAL CONFERENCE ON MATERIALS FOR ADVANCED TECHNOLOGIES (ICMAT2015) - SYMPOSIUM B, N, U, W, Z
(2016)