Lin J, Chen H, Gao Y, Cai Y, Jin J, Etman AS, Kang J, Lei T, Lin Z, Folgueras MC, Quan LN, Kong Q, Sherburne M, Asta M, Sun J, Toney MF, Wu J, Yang P. Pressure-induced semiconductor-to-metal phase transition of a charge-ordered indium halide perovskite. Proc Natl Acad Sci U S A. 2019 Nov 19; 116(47):23404-23409.