@article{cd2381ccb5f848e0b7c1199b81165d5c,
title = "Extreme Ultraviolet Second Harmonic Generation Spectroscopy in a Polar Metal",
abstract = "The coexistence of ferroelectricity and metallicity seems paradoxical, since the itinerant electrons in metals should screen the long-range dipole interactions necessary for dipole ordering. The recent discovery of the polar metal LiOsO3 was therefore surprising [as discussed earlier in Y. Shi et al., Nat. Mater. 2013, 12, 1024]. It is thought that the coordination preferences of the Li play a key role in stabilizing the LiOsO3 polar metal phase, but an investigation from the combined viewpoints of core-state specificity and symmetry has yet to be done. Here, we apply the novel technique of extreme ultraviolet second harmonic generation (XUV-SHG) and find a sensitivity to the broken inversion symmetry in the polar metal phase of LiOsO3 with an enhanced feature above the Li K-edge that reflects the degree of Li atom displacement as corroborated by density functional theory calculations. These results pave the way for time-resolved probing of symmetry-breaking structural phase transitions on femtosecond time scales with element specificity.",
author = "Emma Berger and Sasawat Jamnuch and Uzundal, {Can B.} and Clarisse Woodahl and Hari Padmanabhan and Angelique Amado and Paul Manset and Yasuyuki Hirata and Yuya Kubota and Shigeki Owada and Kensuke Tono and Makina Yabashi and Cuixiang Wang and Youguo Shi and Venkatraman Gopalan and Schwartz, {Craig P.} and Drisdell, {Walter S.} and Iwao Matsuda and Freeland, {John W.} and Pascal, {Tod A.} and Michael Zuerch",
note = "Funding Information: M.Z., C.P.S. and A.A. acknowledge support by the Max Planck Society (Max Planck Research Group). M.Z. acknowledges support by the Federal Ministry of Education and Research (BMBF), under“Make our Planet Great Again - German Research Initiative” (Grant No. 57427209 “QUESTforENERGY”) implemented by DAAD. J.W.F., H.P. and V.G. acknowledge Department of Energy Grant No. DE SC-0012375. W.S.D. acknowledges support from the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the U.S. Department of Energy, under Award No. DE-SC0004993. Measurements were performed at BL1 of SACLA with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2019B8066). This work was supported by the SACLA Basic Development Program 2018–2020. The authors would like to acknowledge the supporting members of the SACLA facility. Additional measurements were performed at beamline 6.3.2 of the Advanced Light Source, a U.S. DOE Office of Science User Facility (under Contract No. DE-AC02-05CH11231). This research used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy, under Contract No. DE-AC02-05CH11231. This work also used the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation (Grant No. ACI-1548562). C. Wang and Y.S. acknowledge the National Natural Science Foundation of China (No. U2032204) and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (No. XDB33000000). C. Woodahl acknowledges support by the National Science Foundation REU Program (Grant No. 1852537). M.Z. acknowledges funding by the W. M. Keck Foundation, funding from the UC Office of the President within the Multicampus Research Programs and Initiatives (M21PL3263), and funding from Laboratory Directed Research and Development Program at Berkeley Lab (107573). We are grateful for input and discussion with David Attwood and Ramamoorthy Ramesh. Publisher Copyright: {\textcopyright} 2021 The Authors. Published by American Chemical Society.",
year = "2021",
month = jul,
day = "28",
doi = "10.1021/acs.nanolett.1c01502",
language = "English (US)",
volume = "21",
pages = "6095--6101",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "14",
}