Abstract
The authors would like to thank Jia-Wern Chen, Dr. Cheng-Hung Chu, Tomoki Watanabe, and Prof. Masanobu Haraguchi for useful discussions. We also acknowledge use of an optical measurement setup supported by Prof. Min-Hsiung Shih. We acknowledge financial support from the Ministry of Science and Technology, Taiwan (Grant No. MOST-109-2112-M-001-043-MY3 (Y.J.L.); MOST-110-2124-M-001-008-MY3 (Y.J.L.); MOST-110-2636-E-007-020 (H.H.C.); MOST-110-2622-8-007-015 (H.H.C.)) and Academia Sinica (Grant No. AS-CDA-108-M08 (Y.J.L.)). H.W.L. acknowledges the financial support from the AFOSR-AOARD (Award Number: FA2386-18-1-4099). V.T. is indebted to the support from the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2018-CARF/CCF-3079.
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