@article{24ad02241cf74871aa1261b571c250fd,
title = "Dynamic Optical Tuning of Interlayer Interactions in the Transition Metal Dichalcogenides",
abstract = "Modulation of weak interlayer interactions between quasi-two-dimensional atomic planes in the transition metal dichalcogenides (TMDCs) provides avenues for tuning their functional properties. Here we show that above-gap optical excitation in the TMDCs leads to an unexpected large-amplitude, ultrafast compressive force between the two-dimensional layers, as probed by in situ measurements of the atomic layer spacing at femtosecond time resolution. We show that this compressive response arises from a dynamic modulation of the interlayer van der Waals interaction and that this represents the dominant light-induced stress at low excitation densities. A simple analytic model predicts the magnitude and carrier density dependence of the measured strains. This work establishes a new method for dynamic, nonequilibrium tuning of correlation-driven dispersive interactions and of the optomechanical functionality of TMDC quasi-two-dimensional materials.",
keywords = "2D materials, Casimir effect, femtosecond X-ray scattering, interlayer van der Waals interactions, ultrafast",
author = "Mannebach, {Ehren M.} and Clara Nyby and Friederike Ernst and Yao Zhou and John Tolsma and Yao Li and Sher, {Meng Ju} and Tung, {I. Cheng} and Hua Zhou and Qi Zhang and Seyler, {Kyle L.} and Genevieve Clark and Yu Lin and Diling Zhu and Glownia, {James M.} and Kozina, {Michael E.} and Sanghoon Song and Silke Nelson and Apurva Mehta and Yifei Yu and Anupum Pant and Aslan, {Ozgur Burak} and Archana Raja and Yinsheng Guo and Anthony Dichiara and Wendy Mao and Linyou Cao and Sefaattin Tongay and Jifeng Sun and Singh, {David J.} and Heinz, {Tony F.} and Xiaodong Xu and Macdonald, {Allan H.} and Evan Reed and Haidan Wen and Lindenberg, {Aaron M.}",
note = "Funding Information: This work was supported by the Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under contract DE-AC02-76SF00515. Use of the Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Use of BioCARS was also supported by the National Institute of General Medical Sciences of the National Institutes of Health under Grant R24GM111072. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. The time-resolved setup at Sector 14 was funded in part through a collaboration with Philip Anfinrud (NIH/NIDDK). C.N. acknowledges support from the NSF through a Graduate Research Fellowship (DGE-114747). F.E. gratefully acknowledges Grant LPDS 2013-13 from the German National Academy of Sciences Leopoldina. I.T., Q.Z., K.S., G.C., X. X., and H.W. acknowledge the support from the Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-SC0012509. D.J.S. and J.S. acknowledge support from the Department of Energy, Office of Science, Computational Materials Science Program, MAGICS Center, award DE-SC0014607. S.T. acknowledges funding from DMR 1552220. Publisher Copyright: {\textcopyright} 2017 American Chemical Society.",
year = "2017",
month = dec,
day = "13",
doi = "10.1021/acs.nanolett.7b03955",
language = "English (US)",
volume = "17",
pages = "7761--7766",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "12",
}