%0 Journal Article
%A Ke Chen
%A Bai Song
%A Navaneetha K Ravichandran
%A Qiye Zheng
%A Xi Chen
%A Hwijong Lee
%A Haoran Sun
%A Sheng Li
%A Geethal AmilaGama Gamage
%A Fei Tian
%A Zhiwei Ding
%A Qichen Song
%A Akash Rai
%A Hanlin Wu
%A Pawan Koirala
%A Aaron J Schmidt
%A Kenji Watanabe
%A Bing Lv
%A Zhifeng Ren
%A Li Shi
%A David G Cahill
%A Takashi Taniguchi
%A David Broido
%A Gang Chen
%B Science
%D 2020
%G eng
%N 6477
%P 555 - 559
%R 10.1126/science.aaz6149
%T Ultrahigh thermal conductivity in isotope-enriched cubic boron nitride
%V 367
%8 01/2020
%! Science
%X <p><span>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 enriched&nbsp;</span><span>10</span><span>B or&nbsp;</span><span>11</span><span>B. 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.</span></p>