APPLIED PHYSICS LETTERS

CHE YL, ZHANG YT, CAO XL, SONG XX, ZHANG HT, CAO MX, DAI HT, YANG JB, ZHANG GZ, YAO JQ

MATERIALS LETTERS

SONG XX, ZHANG YT, ZHANG HT, YU Y, CAO MX, CHE YL, WANG JL, YANG JB, DING X, YAO JQ