Browsing by Author "Chen, Zekun"

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    Barbalinardo et al. Reply
    (American Physical Society, 2022-06-24) Barbalinardo, Giuseppe; Chen, Zekun; Dong, Haikuan; Fan, Zheyong; Donadio, Davide; University of California Davis; Multiscale Statistical and Quantum Physics; Department of Applied Physics
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    Ultrahigh Convergent Thermal Conductivity of Carbon Nanotubes from Comprehensive Atomistic Modeling
    (American Physical Society, 2021-07-09) Barbalinardo, Giuseppe; Chen, Zekun; Dong, Haikuan; Fan, Zheyong; Donadio, Davide; Department of Applied Physics; Multiscale Statistical and Quantum Physics; Centre of Excellence in Quantum Technology, QTF; University of California, Davis
    Anomalous heat transport in one-dimensional nanostructures, such as nanotubes and nanowires, is a widely debated problem in condensed matter and statistical physics, with contradicting pieces of evidence from experiments and simulations. Using a comprehensive modeling approach, comprised of lattice dynamics and molecular dynamics simulations, we proved that the infinite length limit of the thermal conductivity of a (10,0) single-wall carbon nanotube is finite but this limit is reached only for macroscopic lengths due to a thermal phonon mean free path of several millimeters. Our calculations showed that the extremely high thermal conductivity of this system at room temperature is dictated by quantum effects. Modal analysis showed that the divergent nature of thermal conductivity, observed in one-dimensional model systems, is suppressed in carbon nanotubes by anharmonic scattering channels provided by the flexural and optical modes with polarization in the plane orthogonal to the transport direction.