APPLIED PHYSICS LETTERS

CHEN Q, SHI CT, ZHANG CF, PU SY, WANG R, WU XW, WANG XY, XUE F, PAN DY, XIAO M

APPLIED PHYSICS LETTERS

HE YJ, LAO JC, YANG TT, LI X, ZANG XB, LI XM, ZHU M, CHEN Q, ZHONG ML, ZHU HW