Capturing 3D atomic defects and phonon localization at the 2D heterostructure interface.

This work was primarily supported by the US Department of Energy (DOE), Office of Science, Basic Energy Sciences, Division of Materials Sciences and Engineering under award DE-SC0010378and DESC0014430. We also acknowledge support by the Army Research Office MURI program under grant no.W911NF-18-1-0431, STROBE: a National Science Foundation (NSF) Science and Technology Center under award DMR1548924, and the NSF DMREF program under award DMR-1437263.The work at UC Irvine was partially supported by the NSF through the University of California-Irvine Materials Research Science and Engineering Center under awardDMR-2011967. TEM experiments were conducted using the facilities in the Irvine Materials Research Institute (IMRI) at the University of California, Irvine.