On-Chip Cavity Electroacoustics Using Lithium Niobate Phononic Crystal ResonatorsRemoveJun Ji, Joseph G. Thomas, Zichen Xi, Liyang Jin, Dayrl P. Briggs, Ivan I. Kravchenko, Arya G. Pour, Liyan Zhu, Yizheng Zhu, and Linbo ShaoPhys. Rev. Lett. 136, 227001 (2026)