702 citations · 3.7k across the 37 of their papers we have counts for
37 papers
Tunable phononic transparency and opacity with isotopic defects
Zhun-Yong Ong
In an isotopically disordered harmonic chain, phonon transmission attenuates exponentially with distance because of multiple scattering by the isotopic defects. We propose a simple…
Exact scattering cross section for lattice-defect scattering of phonons using the atomistic Green's function method
Zhun-Yong Ong
The use of structurally complex lattice defects, such as functional groups, embedded nanoparticles, and nanopillars, to generate phonon scattering is a popular approach in phonon e…
Effect of boundary roughness on the attenuation of specular phonon reflection in graphene
Zhun-Yong Ong
The reduced phonon specularity from boundary roughness scattering plays a major role in the lower thermal conductivity in semiconducting and insulating nanowires and films. Alt…
Control of wave scattering for robust coherent transmission in a disordered medium
Zhun-Yong Ong
The spatial structure of the inhomogeneity in a disordered medium determines how waves scatter and propagate in it. We present a theoretical model of how the Fourier components of…
The Atomistic Green's Function method for acoustic and elastic wave-scattering problems
Hossein Khodavirdi, Zhun-Yong Ong, Ankit Srivastava
In this paper, we present a powerful method (Atomistic Green's Function, AGF) for calculating the effective Hamiltonian of acoustic and elastic wave-scatterers. The ability to calc…
The role of flexural coupling in heat dissipation from a two-dimensional layered material to its hexagonal boron nitride substrate
Zhun-Yong Ong, Gang Zhang, Yong-Wei Zhang
Understanding the limits of phononic heat dissipation from a two-dimensional layered material (2DLM) to its hexagonal boron nitride (h-BN) substrate and how it varies with the stru…
Specular transmission and diffuse reflection in phonon scattering at grain boundary
Zhun-Yong Ong
It is widely assumed in the literature that the specularity parameters for phonon transmission (forward scattering) and reflection (backward scattering) at a boundary are identical…
Complementary local-global approach for phonon mode connectivities
Chee Kwan Gan, Zhun-Yong Ong
Sorting and assigning phonon branches (e.g., longitudinal acoustic) of phonon modes is important for characterizing the phonon bands of a crystal and the determination of phonon pr…
Theoretical analysis of thermal boundary conductance of MoS2-SiO2 and WS2-SiO2 interface
Zhun-Yong Ong, Yongqing Cai, Gang Zhang +1
Understanding the physical processes involved in interfacial heat transfer is critical for the interpretation of thermometric measurements and the optimization of heat dissipation…
Gate-tunable cross-plane heat dissipation in single-layer transition metal dichalcogenides
Zhun-Yong Ong, Gang Zhang, Linyou Cao +1
Efficient heat dissipation to the substrate is crucial for optimal device performance in nanoelectronics. We develop a theory of electronic thermal boundary conductance (TBC) media…
Structure-specific, mode-resolved phonon coherence and specularity at graphene grain boundaries
Zhun-Yong Ong, Georg Schusteritsch, Chris J. Pickard
In spite of their importance for understanding phonon transport phenomena in thin films and polycrystalline solids, the effects of boundary roughness scattering on phonon speculari…
Energy dissipation in van der Waals two-dimensional devices
Zhun-Yong Ong, Myung-Ho Bae
Understanding the physics underlying energy dissipation is necessary for the effective thermal management of devices based on two-dimensional (2D) materials and requires insights i…
Atomistic S-matrix method for numerical simulation of phonon reflection, transmission and boundary scattering
Zhun-Yong Ong
The control of phonon scattering by interfaces is critical to the manipulation of heat conduction in composite materials and semiconducting nanostructures. However, one of the fact…
Tutorial: Concepts and numerical techniques for modeling individual phonon transmission at interfaces
Zhun-Yong Ong
At the nanoscale, thermal transport across the interface between two lattice insulators can be described by the transmission of bulk phonons and depends on the crystallographic str…
Thickness-dependent Kapitza resistance in multilayered graphene and other two-dimensional crystals
Zhun-Yong Ong
The Kapitza or thermal boundary resistance (TBR), which limits heat dissipation from a thin film to its substrate, is a major factor in the thermal management of ultrathin nanoelec…
Analyzing the Carrier Mobility in Transition-metal Dichalcogenide MoS2 Field-effect Transistors
Zhihao Yu, Zhun-Yong Ong, Songlin Li +5
Transition-metal dichalcogenides (TMDCs) are important class of two-dimensional (2D) layered materials for electronic and optoelectronic applications, due to their ultimate body th…
Theory of substrate-directed heat dissipation for single-layer graphene and other two-dimensional crystals
Zhun-Yong Ong, Yongqing Cai, Gang Zhang
We present a theory of the phononic thermal (Kapitza) resistance at the interface between graphene or another single-layer two-dimensional (2D) crystal (e.g. MoS) and a flat…
Transport and localization in a topological phononic lattice with correlated disorder
Zhun-Yong Ong, Ching Hua Lee
Recently proposed classical analogs of topological insulators in phononic lattices have the advantage of much more accessible experimental realization as compared to conventional m…
Realization of Room-Temperature Phonon-limited Carrier Transport in Monolayer MoS2 by Dielectric and Carrier Screening
Zhihao Yu, Zhun-Yong Ong, Yiming Pan +9
We show that by combining high-k dielectric substrate and high density of charge carriers, Coulomb impurity can be effectively screened, leading to an unprecedented room-temperatur…
High-Performance Monolayer WS2 Field-effect Transistors on High-k Dielectrics
Yang Cui, Run Xin, Zhihao Yu +13
The combination of high-quality Al2O3 dielectric and thiol chemistry passivation can effectively reduce the density of interface traps and Coulomb impurities of WS2, leading to a s…
Enhancement and reduction of one-dimensional heat conduction with correlated mass disorder
Zhun-Yong Ong, Gang Zhang
Short-range order in strongly disordered structures plays an important role in their heat conduction property. Using numerical and analytical methods, we show that short-range spat…
Anisotropic charged impurity-limited carrier mobility in monolayer phosphorene
Zhun-Yong Ong, Gang Zhang, Yong Wei Zhang
The room temperature carrier mobility in atomically thin 2D materials is usually far below the intrinsic limit imposed by phonon scattering as a result of scattering by remote char…
Mobility enhancement and temperature dependence in top-gated single-layer MoS2
Zhun-Yong Ong, Massimo V. Fischetti
The deposition of a high- oxide overlayer is known to significantly enhance the room-temperature electron mobility in single-layer MoS (SLM) but not in single-layer graphe…
Strong Thermal Transport Anisotropy and Strain Modulation in Single-Layer Phosphorene
Zhun-Yong Ong, Yongqing Cai, Gang Zhang +1
Using first-principles calculations and non-equilibrium Green's function method, we investigate the ballistic thermal transport in single-layer phosphorene. A significant crystallo…