73 citations · 239 across the 9 of their papers we have counts for
9 papers
Thermal resistance from non-equilibrium phonons at Si-Ge interface
Xun Li, Jinchen Han, Sangyeop Lee
As nanostructured devices become prevalent, interfaces often play an important role in thermal transport phenomena. However, interfacial thermal transport remains poorly understood…
Transient Hydrodynamic Lattice Cooling by Picosecond Laser Irradiation of Graphite
Jihoon Jeong, Xun Li, Sangyeop Lee +2
Recent theories and experiments have suggested hydrodynamic phonon transport features in graphite at unusually high temperatures. Here, we report a pico-second pump-probe thermal r…
Ab initio phonon transport across grain boundaries in graphene using machine learning based on small dataset
Amirreza Hashemi, Ruiqiang Guo, Keivan Esfarjani +1
Establishing the structure-property relationship for grain boundaries (GBs) is critical for developing next generation functional materials, but has been severely hampered due to i…
Mie Scattering of Phonons by Point Defects in IV-VI Semiconductors PbTe and GeTe
Ruiqiang Guo, Sangyeop Lee
Point defects in solids such as vacancy and dopants often cause large thermal resistance. Because the lattice site occupied by a point defect has a much smaller size than phonon wa…
Machine-learning based interatomic potential for phonon transport in perfect crystalline Si and crystalline Si with vacancies
Hasan Babaei, Ruiqiang Guo, Amirreza Hashemi +1
We report that single interatomic potential, developed using Gaussian regression of density functional theory calculation data, has high accuracy and flexibility to describe phonon…
Hydrodynamic Phonon Transport: Past, Present, and Prospect
Sangyeop Lee, Xun Li
The hydrodynamic phonon transport was studied several decades ago for verifying the quantum theory of lattice thermal transport. Recent prediction of significant hydrodynamic phono…
Thermal resistance by transition between collective and non-collective phonon flows in graphitic materials
Sangyeop Lee, Xun Li, Ruitiang Guo
Phonons in graphitic materials exhibit strong normal scattering (N-scattering) compared to umklapp scattering (U-scattering). The strong N-scattering cause collective phonon flow,…
Crossover of ballistic, hydrodynamic, and diffusive phonon transport in suspended graphene
Xun Li, Sangyeop Lee
Hydrodynamic phonon transport was recently predicted as an important regime for phonon transport in graphitic materials. Many of past studies on hydrodynamic phonon transport have…
Critical role of next-nearest-neighbor interlayer interaction in magnetic behavior of magnetic/nonmagnetic multilayers
Sunjae Chung, Sangyep Lee, Taehee Yoo +9
We report magnetoresistance data in magnetic semiconductor multilayers, which exhibit a clear step-wise behavior as a function of external field. We attribute this highly non-trivi…