@article{9358e6062378494fb14f30ddaf3c0939,
title = "Spatial Mapping of Electrostatic Fields in 2D Heterostructures",
abstract = "In situ electron microscopy is an effective tool for understanding the mechanisms driving novel phenomena in 2D structures. However, due to practical challenges, it is difficult to address these technologically relevant 2D heterostructures with electron microscopy. Here, we use the differential phase contrast (DPC) imaging technique to build a methodology for probing local electrostatic fields during electrical operation with nanoscale spatial resolution in such materials. We find that, by combining a traditional DPC setup with a high-pass filter, we can largely eliminate electric fluctuations emanating from short-range atomic potentials. Using a method based on this filtering algorithm, a priori electric field expectations can be directly compared with experimentally derived values to readily identify inhomogeneities and potentially problematic regions. We use this platform to analyze the electric field and charge density distribution across layers of hBN and MoS2.",
keywords = "MoS, differential phase contrast, heterostructure, in situ electron microscopy, transition-metal dichalcogenides",
author = "Murthy, {Akshay A.} and Ribet, {Stephanie M.} and Stanev, {Teodor K.} and Pufan Liu and Kenji Watanabe and Takashi Taniguchi and Stern, {Nathaniel P.} and Reis, {Roberto Dos} and Dravid, {Vinayak P.}",
note = "Funding Information: This material is based upon work supported by the National Science Foundation under Grant No. DMR-1929356. This work made use of the EPIC, Keck-II, and SPID facilities of Northwestern University{\textquoteright}s NUANCE Center, which has received support from the SHyNE Resource (NSF ECCS-2025633), the IIN, and Northwestern{\textquoteright}s MRSEC program (NSF DMR-1720139). A.A.M. and S.M.R. gratefully acknowledge support from the Ryan Fellowship and the IIN at Northwestern University. T.K.S. was supported by the Office of Naval Research (N00014-16-1-3055) and the National Science Foundation (DMR-1905986). P.L. was supported by Argonne National Laboratory. K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant No. JPMXP0112101001, JSPS KAKENHI Grant No. JP20H00354 and the CREST (JPMJCR15F3), JST. The authors thank Erik Lenferink for assistance with sample characterization. Research reported in this publication was supported in part by instrumentation provided by the Office of The Director, National Institutes of Health, of the National Institutes of Health under Award No. S10OD026871. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. This research was supported in part through the computational resources and staff contributions provided for the Quest high-performance computing facility at Northwestern University, which is jointly supported by the Office of the Provost, the Office for Research, and Northwestern University Information Technology. Publisher Copyright: {\textcopyright} 2021 American Chemical Society.",
year = "2021",
month = sep,
day = "8",
doi = "10.1021/acs.nanolett.1c01636",
language = "English (US)",
volume = "21",
pages = "7131--7137",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "17",
}