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Breaking Rayleigh's law with spatially correlated disorder to control phonon transport
Simon Thébaud, Lucas Lindsay, Tom Berlijn
Controlling thermal transport in insulators and semiconductors is crucial for many technological fields such as thermoelectrics and thermal insulation, for which a low thermal cond…
Magnon Orbital Angular Momentum of Ferromagnetic Honeycomb and Zig-Zag Lattices
R. S. Fishman, T. Berlijn, J. Villanova +1
By expanding the gauge for magnon band in harmonics of momentum , we demonstrate that the only observable component of the magnon orbital angular momen…
Primitive to conventional geometry projection for efficient phonon transport calculations
Xun Li, Simon Thebaud, Lucas Lindsay
The primitive Wigner-Seitz cell and corresponding first Brillouin zone (FBZ) are typically used in calculations of lattice vibrational and transport properties as they contain the…
Phonons and phase symmetries in bulk from scattering measurements and theory
Xun Li, Seunghwan Do, Jiaqiang Yan +7
Phonon-derived behaviors are important indicators of novel phenomena in transition metal trihalides, including spin liquid behavior, two-dimensional magnetism, and spin-lattice cou…
Exact Results for the Orbital Angular Momentum of Magnons on Honeycomb Lattices
Randy S. Fishman, Lucas Lindsay, Satoshi Okamoto
We obtain exact results for the orbital angular momentum (OAM) of magnons at the high symmetry points of ferromagnetic (FM) and antiferromagnetic (AF) honeycomb lattices in the pre…
Perturbation theory and thermal transport in mass-disordered alloys: Insights from Green's function methods
Simon Thébaud, Tom Berlijn, Lucas Lindsay
Lowest-order quantum perturbation theory (Fermi's golden rule) for phonon-disorder scattering has been used to predict thermal conductivities in several semiconducting alloys with…
Success and breakdown of the T-matrix approximation for phonon-disorder scattering
S. Thébaud, C. A. Polanco, L. Lindsay +1
We examine the validity of the widely used T-matrix approximation for treating phonon-disorder scattering by implementing an unfolding algorithm that allows simulation of disorder…
Unfolding the complexity of quasi-particle physics in disordered materials
Sai Mu, Raina Olsen, B. Dutta +9
The concept of quasi-particles forms the theoretical basis of our microscopic understanding of emergent phenomena associated with quantum mechanical many-body interactions. However…
Experimental demonstration of a generalized Fourier's Law for non-diffusive thermal transport
Chengyun Hua, Lucas Lindsay, Xiangwen Chen +1
Phonon heat conduction over length scales comparable to their mean free paths is a topic of considerable interest for basic science and thermal management technologies. Although th…
Dislocation-induced thermal transport anisotropy in single-crystal group-III nitride films
Bo Sun, Georg Haunschild, Carlos Polanco +4
Dislocations, one-dimensional lattice imperfections, are common to technologically important materials such as III-V semiconductors, and adversely affect heat dissipation in e.g.,…
Antisite pairs suppress the thermal conductivity of BAs
Qiang Zheng, Carlos A. Polanco, Mao-Hua Du +4
BAs was predicted to have an unusually high thermal conductivity at room temperature of 2000WmK, comparable to that of diamond. However, the experimentally me…
High-temperature magnetostructural transition in van der Waals-layered a-MoCl3
Michael A. McGuire, Jiaqiang Yan, Paula Lampen-Kelley +9
The crystallographic and magnetic properties of the cleavable 4d3 transition metal compound a-MoCl3 are reported, with a focus on the behavior above room temperature. Crystals were…
Phonon thermal transport in 2H, 4H and 6H silicon carbide from first principles
Nakib Haider Protik, Ankita Katre, Lucas Lindsay +3
Silicon carbide (SiC) is a wide band gap semiconductor with a variety of industrial applications. Among its many useful properties is its high thermal conductivity, which makes it…
Ultra-low-loss Polaritons in Isotopically Pure Materials: A New Approach
Alexander J. Giles, Siyuan Dai, Igor Vurgaftman +12
Conventional optical components are limited to size-scales much larger than the wavelength of light, as changes in the amplitude, phase and polarization of the electromagnetic fiel…
The role of low-energy phonons with mean-free-paths >0.8 um in heat conduction in silicon
Puqing Jiang, Yee Kan Koh
Despite recent progress in the first-principles calculations and measurements of phonon mean-free-paths (MFPs), contribution of low-energy phonons to heat conduction in silicon is…
Thermal conductivity of graphene mediated by strain and size
Youdi Kuang, Lucas Lindsay, Sanqiang Shi +3
Based on first-principles calculations and full iterative solution of the linearized Boltzmann-Peierls transport equation for phonons within three-phonon scattering framework, we c…