The authors gratefully acknowledge funding provided by the National Science Foundation (NSF) through the Pennsylvania State University 2D Crystal Consortium–Materials Innovation Platform (2DCC-MIP) under NSF cooperative agreement DMR-1539916. D.R.H, S.B., and N.A. also acknowledge support from the NSF CAREER program (DMR-1654107) and the NSF program EFRI 2-DARE (EFRI-1433378). L.M. and N.A acknowledge support by NSF through the Pennsylvania State University Materials Research Science and Engineering Center (MRSEC, DMR-2011839). This work utilized resources provided by the NSF-MRSEC-sponsored Materials Characterization Lab at Penn State.
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