Zherui Han

All Publications

• Effects of four-phonon scattering on phonon hydrodynamics in monolayer graphene PHYSICAL REVIEW B Li, X., Han, Z., Ruan, X., Shi, L. 2025; 112 (10)

  View details for DOI 10.1103/pp9w-jyb3

  View details for Web of Science ID 001578275200003

• High-Order Anharmonicities Shape Phonon Hydrodynamic Effects in Graphene. Nano letters Tur-Prats, J., Han, Z., Beardo, A., Ruan, X., Alvarez, F. X. 2025

  Abstract

  Prominent phonon hydrodynamic phenomena were predicted in graphene at low temperatures due to the abundance of momentum-conserving three-phonon interactions. Recent studies, however, have shown that higher-order interactions constitute an additional resistive channel that significantly reduces the thermal conductivity of this material. Here, we show that the occurrence of hydrodynamic effects in graphene is severely conditioned by four-phonon interactions. Contrary to conventional understanding, we first demonstrate that the collective limit assumption, in which the phonon distribution is fully correlated, is not adequate to understand the hydrodynamic transport mechanisms in graphene. Then we report the key hydrodynamic parameters, namely the nonlocal length and the heat flux relaxation time, and we show that they are significantly reduced if considering full anharmonicity. Finally, we discuss observable implications in a variety of experimental configurations and we critically review previous predictions on the necessary conditions for the manifestation of collective phonon behavior and phonon hydrodynamics.

  View details for DOI 10.1021/acs.nanolett.5c00855

  View details for PubMedID 40635367

• Phonon local non-equilibrium at Al/Si interface from machine learning molecular dynamics JOURNAL OF APPLIED PHYSICS Khot, K., Xiao, B., Han, Z., Guo, Z., Xiong, Z., Ruan, X. 2025; 137 (11)

  View details for DOI 10.1063/5.0243641

  View details for Web of Science ID 001448172200002

• Anisotropic anharmonicity dictates the thermal conductivity of β-Ga2O3 PHYSICAL REVIEW B Alkandari, A., Han, Z., Guo, Z., Beechem, T. E., Ruan, X. 2025; 111 (9)

  View details for DOI 10.1103/PhysRevB.111.094308

  View details for Web of Science ID 001497976900003

• FOS: A fully integrated open-source program for Fast Optical Spectrum calculations of nanoparticle media COMPUTER PHYSICS COMMUNICATIONS Carne, D., Peoples, J., Guo, Z., Feng, D., Han, Z., Liu, X., Ruan, X. 2025; 307

  View details for DOI 10.1016/j.cpc.2024.109393

  View details for Web of Science ID 001336628800001

• First-principles prediction of zone-center optical phonon linewidths and IR spectra of hexagonal boron nitride APPLIED PHYSICS LETTERS Guo, Z., Sokalski, P., Han, Z., Cheng, Y., Shi, L., Taniguchi, T., Watanabe, K., Ruan, X. 2024; 125 (23)

  View details for DOI 10.1063/5.0223650

  View details for Web of Science ID 001373679000003

• First-principles prediction of thermal conductivity of bulk hexagonal boron nitride APPLIED PHYSICS LETTERS Guo, Z., Han, Z., Alkandari, A., Khot, K., Ruan, X. 2024; 124 (16)

  View details for DOI 10.1063/5.0210935

  View details for Web of Science ID 001204074000020

• Near-field radiation in BAs and BSb dominated by four-phonon scattering PHYSICAL REVIEW B Feng, D., Yang, X., Han, Z., Ruan, X. 2024; 109 (8)

  View details for DOI 10.1103/PhysRevB.109.L081409

  View details for Web of Science ID 001220513500002

• Sampling-accelerated prediction of phonon scattering rates for converged thermal conductivity and radiative properties NPJ COMPUTATIONAL MATERIALS Guo, Z., Han, Z., Feng, D., Lin, G., Ruan, X. 2024; 10 (1)

  View details for DOI 10.1038/s41524-024-01215-8

  View details for Web of Science ID 001157688800001

• Machine Learning Designed and Experimentally Confirmed Enhanced Reflectance in Aperiodic Multilayer Structures ADVANCED OPTICAL MATERIALS Chowdhury, P., Khot, K., Song, J., He, Z., Kortge, D., Han, Z., Bermel, P., Wang, H., Ruan, X. 2024; 12 (4)

  View details for DOI 10.1002/adom.202300610

  View details for Web of Science ID 001118007400001

• Predictions and measurements of thermal conductivity of ceramic materials at high temperature PHYSICAL REVIEW B Han, Z., Xiong, Z., Riffe, W. T., Schonfeld, H. B., Segovia, M., Song, J., Wang, H., Xu, X., Hopkins, P. E., Marconnet, A., Ruan, X. 2023; 108 (18)

  View details for DOI 10.1103/PhysRevB.108.184306

  View details for Web of Science ID 001141855300009

• Thermal conductivity of monolayer graphene: Convergent and lower than diamond PHYSICAL REVIEW B Han, Z., Ruan, X. 2023; 108 (12)

  View details for DOI 10.1103/PhysRevB.108.L121412

  View details for Web of Science ID 001089572400002

• Fast and accurate machine learning prediction of phonon scattering rates and lattice thermal conductivity NPJ COMPUTATIONAL MATERIALS Guo, Z., Chowdhury, P., Han, Z., Sun, Y., Feng, D., Lin, G., Ruan, X. 2023; 9 (1)

  View details for DOI 10.1038/s41524-023-01020-9

  View details for Web of Science ID 000999863800001

• Temperature-dependent full spectrum dielectric function of semiconductors from first principles PHYSICAL REVIEW B Han, Z., Lee, C., Song, J., Wang, H., Bermel, P., Ruan, X. 2023; 107 (20)

  View details for DOI 10.1103/PhysRevB.107.L201202

  View details for Web of Science ID 001055194800005

• Prediction of hot zone-center optical phonons in laser-irradiated molybdenum disulfide with a semiconductor multitemperature model PHYSICAL REVIEW B Han, Z., Sokalski, P., Shi, L., Ruan, X. 2023; 107 (4)

  View details for DOI 10.1103/PhysRevB.107.L041407

  View details for Web of Science ID 000961135700001

• Effects of hot phonons and thermal stress in micro-Raman spectra of molybdenum disulfide APPLIED PHYSICS LETTERS Sokalski, P., Han, Z., Fleming, G., Smith, B., Sullivan, S. E., Huang, R., Ruan, X., Shi, L. 2022; 121 (18)

  View details for DOI 10.1063/5.0122945

  View details for Web of Science ID 000880112000014

• Abnormal in-plane thermal conductivity anisotropy in bilayer a-phase tellurene INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER Cheng, Y., Yang, X., Han, Z., Wu, W., Luo, X., Ruan, X. 2022; 192

  View details for DOI 10.1016/j.ijheatmasstransfer.2022.122908

  View details for Web of Science ID 000799977100003

• Raman Linewidth Contributions from Four-Phonon and Electron-Phonon Interactions in Graphene PHYSICAL REVIEW LETTERS Han, Z., Yang, X., Sullivan, S. E., Feng, T., Shi, L., Li, W., Ruan, X. 2022; 128 (4): 045901

  Abstract

  The Raman peak position and linewidth provide insight into phonon anharmonicity and electron-phonon interactions in materials. For monolayer graphene, prior first-principles calculations have yielded decreasing linewidth with increasing temperature, which is opposite to measurement results. Here, we explicitly consider four-phonon anharmonicity, phonon renormalization, and electron-phonon coupling, and find all to be important to successfully explain both the G peak frequency shift and linewidths in our suspended graphene sample over a wide temperature range. Four-phonon scattering contributes a prominent linewidth that increases with temperature, while temperature dependence from electron-phonon interactions is found to be reversed above a doping threshold (ℏω_{G}/2, with ω_{G} being the frequency of the G phonon).

  View details for DOI 10.1103/PhysRevLett.128.045901

  View details for Web of Science ID 000754148900009

  View details for PubMedID 35148139

• FourPhonon: An extension module to ShengBTE for computing four-phonon scattering rates and thermal conductivity COMPUTER PHYSICS COMMUNICATIONS Han, Z., Yang, X., Li, W., Feng, T., Ruan, X. 2022; 270

  View details for DOI 10.1016/j.cpc.2021.108179

  View details for Web of Science ID 000708648400004