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Unified first-principles theory of thermal properties of insulators

https://doi.org/10.1103/PhysRevB.98.085205

Ravichandran, Navaneetha K. ; Broido, David ( August 2018 , Physical Review B)
Fermi Surface Nesting and Phonon Frequency Gap Drive Anomalous Thermal Transport

https://doi.org/10.1103/PhysRevLett.121.175901

Li, Chunhua ; Ravichandran, Navaneetha K. ; Lindsay, Lucas ; Broido, David ( October 2018 , Physical Review Letters)
Experimental metrology to obtain thermal phonon transmission coefficients at solid interfaces

https://doi.org/10.1103/PhysRevB.95.205423

Hua, Chengyun ; Chen, Xiangwen ; Ravichandran, Navaneetha K. ; Minnich, Austin J. ( May 2017 , Physical Review B)
Role of thermalizing and nonthermalizing walls in phonon heat conduction along thin films

https://doi.org/10.1103/PhysRevB.93.035314

Ravichandran, Navaneetha K. ; Minnich, Austin J. ( January 2016 , Physical Review B)
Ultrahigh thermal conductivity in isotope-enriched cubic boron nitride

https://doi.org/10.1126/science.aaz6149

Chen, Ke ; Song, Bai ; Ravichandran, Navaneetha K. ; Zheng, Qiye ; Chen, Xi ; Lee, Hwijong ; Sun, Haoran ; Li, Sheng ; Udalamatta Gamage, Geethal Amila Gamage ; Tian, Fei ; et al ( January 2020 , Science)

Materials with high thermal conductivity (κ) are of technological importance and fundamental interest. We grew cubic boron nitride (cBN) crystals with controlled abundance of boron isotopes and measured κ greater than 1600 watts per meter-kelvin at room temperature in samples with enriched¹⁰B or¹¹B. In comparison, we found that the isotope enhancement of κ is considerably lower for boron phosphide and boron arsenide as the identical isotopic mass disorder becomes increasingly invisible to phonons. The ultrahigh κ in conjunction with its wide bandgap (6.2 electron volts) makes cBN a promising material for microelectronics thermal management, high-power electronics, and optoelectronics applications.

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