@article{6e3883a91ef54bcf8d1e42c8e6f2b740,
title = "Coherent, atomically thin transition-metal dichalcogenide superlattices with engineered strain",
abstract = "Epitaxy forms the basis of modern electronics and optoelectronics. We report coherent atomically thin superlattices in which different transition metal dichalcogenide monolayers—despite large lattice mismatches—are repeated and laterally integrated without dislocations within the monolayer plane. Grown by an omnidirectional epitaxy, these superlattices display fully matched lattice constants across heterointerfaces while maintaining an isotropic lattice structure and triangular symmetry. This strong epitaxial strain is precisely engineered via the nanoscale supercell dimensions, thereby enabling broad tuning of the optical properties and producing photoluminescence peak shifts as large as 250 millielectron volts. We present theoretical models to explain this coherent growth and the energetic interplay governing the ripple formation in these strained monolayers. Such coherent superlattices provide building blocks with targeted functionalities at the atomically thin limit.",
author = "Saien Xie and Lijie Tu and Yimo Han and Lujie Huang and Kibum Kang and Lao, {Ka Un} and Preeti Poddar and Chibeom Park and Muller, {David A.} and DiStasio, {Robert A.} and Jiwoong Park",
note = "Funding Information: This work was primarily supported by the Air Force Office of Scientific Research (FA9550-16-1-0031, FA9550-16-1-0347, and FA2386-13-1-4118) and the National Science Foundation (NSF) through the Cornell Center for Materials Research with funding from the NSF Materials Research Science and Engineering Centers (MRSEC) program (DMR-1719875), the University of Chicago MRSEC (NSF DMR-1420709), and the Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials (PARADIM; DMR-1539918). Additional funding was provided by the Samsung Advanced Institute of Technology. Material characterizations including electron microscopy were supported by the Cornell Center for Materials Research (NSF DMR-1719875) and the MRSEC Shared User Facilities at the University of Chicago (NSF DMR-1420709). L.T., K.U.L., and R.D. acknowledge partial support from Cornell University through start-up funding. This research used resources of the Argonne Leadership Computing Facility at Argonne National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy under contract no. DE-AC02-06CH11357 and resources of the National Energy Research Scientific Computing Center, which is supported by the Office of Science of the U.S. Department of Energy under contract no. DE-AC02-05CH11231. We thank S. Nagel, T. Witten, and A. Tkatchenko for helpful discussions. We thank J.-U. Lee for help with EL measurements. Publisher Copyright: {\textcopyright} 2017 The Authors.",
year = "2018",
month = mar,
day = "9",
doi = "10.1126/science.aao5360",
language = "English (US)",
volume = "359",
pages = "1131--1136",
journal = "Science",
issn = "0036-8075",
publisher = "American Association for the Advancement of Science",
number = "6380",
}