Huang Ya-Ping, Yun Feng, Ding Wen, Wang Yue, Wang Hong, Zhao Yu-Kun, Zhang Ye, Guo Mao-Feng, Hou Xun, Liu Shuo. The reflectivity and ohmic contact resistivity of Ni/Ag/Ti/Au in contact with p-GaNJ. Acta Physica Sinica, 2014, 63(12): 127302. DOI: 10.7498/aps.63.127302