788 citations · 3.4k across the 34 of their papers we have counts for
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Is Thermal Conductivity of Graphene Divergent and Higher Than Diamond?
Zherui Han, Xiulin Ruan
The thermal conductivity of monolayer graphene is an outstanding challenge with no consensus reached on its exact value and length convergence so far. We consider four-phonon scatt…
Effects of hot phonons and thermal stress in micro-Raman spectra of molybdenum disulphide
Peter Sokalski, Zherui Han, Gabriella Coloyan Fleming +5
Micro-Raman spectroscopy has become an important tool in probing thermophysical behavior in emerging functional materials such as two-dimensional (2D) layered structures. Localized…
Prediction of Hot Zone-center Optical Phonons in Laser Irradiated Molybdenum Disulfide with a Semiconductor Multitemperature Model
Zherui Han, Peter Sokalski, Li Shi +1
Previous multitemperature model (MTM) resolving phonon temperatures at the polarization level and measurements have uncovered remarkable nonequilibrium among different phonon polar…
An iterative machine learning approach for discovering unexpected thermal conductivity enhancement in aperiodic superlattices
Prabudhya Roy Chowdhury, Xiulin Ruan
While machine learning (ML) has shown increasing effectiveness in optimizing materials properties under known physics, its application in challenging conventional wisdom and discov…
Dramatic increase in the thermal boundary conductance and radiation limit from a Nonequilibrium Landauer Approach
Jingjing Shi, Xiaolong Yang, Timothy S. Fisher +1
Thermal boundary conductance (TBC) is critical in many thermal and energy applications. A decades-old puzzle has been that many of the measured TBCs, such as those well characteriz…
Spectral analysis of non-equilibrium molecular dynamics: spectral phonon temperature and phonon local non-equilibrium in thin films and across interfaces
Tianli Feng, Wenjun Yao, Zuyuan Wang +4
Although extensive experimental and theoretical works have been conducted to understand the ballistic and diffusive phonon transport in nanomaterials recently, direct observation o…
Thermal Transport at the Nanoscale - A Fourier's Law vs. Phonon Boltzmann Equation Study
Jan Kaiser, Tianli Feng, Jesse Maassen +3
Steady-state thermal transport in nanostructures with dimensions comparable to the phonon mean-free-path is examined. Both the case of contacts at different temperatures with no in…
Quantum mechanical prediction of four-phonon scattering rates and reduced thermal conductivity of solids
Tianli Feng, Xiulin Ruan
Recently, first principle-based prediction of lattice thermal conductivity from the perturbation theory has achieved significant success. However, it only includes three-phonon…
Molecular dynamics simulations of thermal conductivity and spectral phonon relaxation time in suspended and supported graphene
Bo Qiu, Xiulin Ruan
We perform molecular dynamics (MD) simulations with phonon spectral analysis aiming at understanding the two dimensional (2D) thermal transport in suspended and supported graphene.…
Nonlinear thermal transport and negative differential thermal conductance in graphene nanoribbons
Jiuning Hu, Yan Wang, Ajit Vallabhaneni +2
We employ classical molecular dynamics to study the nonlinear thermal transport in graphene nanoribbons (GNRs). For GNRs under large temperature biases beyond linear response regim…
Thermal Conductivity and Thermal Rectification in Graphene Nanoribbons: a Molecular Dynamics Study
Jiuning Hu, Xiulin Ruan, Yong P. Chen
We have used molecular dynamics to calculate the thermal conductivity of symmetric and asymmetric graphene nanoribbons (GNRs) of several nanometers in size (up to ~4 nm wide and ~1…
Tuning the thermal conductivity of graphene nanoribbons by edge passivation and isotope engineering: a molecular dynamics study
Jiuning Hu, Stephen Schiffli, Ajit Vallabhaneni +2
Using classical molecular dynamics simulation, we have studied the effect of edge-passivation by hydrogen (H-passivation) and isotope mixture (with random or supperlattice distribu…