NATURE COMMUNICATIONS

LEI FC, LIU W, SUN YF, XU JQ, LIU KT, LIANG L, YAO T, PAN BC, WEI SQ, XIE Y

APPLIED PHYSICS LETTERS

CHEN L, HU FC, DUAN HL, LIU QH, TAN H, YAN WS, YAO T, JIANG Y, SUN ZH, WEI SQ