Development of a vacuum ultraviolet laser-based angle-resolved photoemission system with a superhigh energy resolution better than 1 meV.
The design and performance of the first vacuum ultraviolet (VUV) laser-based angle-resolved photoemission (ARPES) system are described. The VUV laser with a photon energy of 6.994 eV and bandwidth of 0.26 meV is achieved from the second harmonic generation using a novel nonlinear optical crystal KBe2BO3F2. The new VUV laser-based ARPES system exhibits superior performance, including superhigh energy resolution better than 1 meV, high momentum resolution, superhigh photon flux, and much enhanced bulk sensitivity, which are demonstrated from measurements on a typical Bi2Sr2CaCu2O8 high temperature superconductor. Issues and further development related to the VUV laser-based photoemission technique are discussed.
Liu
Guodong
G
National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China.
Wang
Guiling
G
Zhu
Yong
Y
Zhang
Hongbo
H
Zhang
Guochun
G
Wang
Xiaoyang
X
Zhou
Yong
Y
Zhang
Wentao
W
Liu
Haiyun
H
Zhao
Lin
L
Meng
Jianqiao
J
Dong
Xiaoli
X
Chen
Chuangtian
C
Xu
Zuyan
Z
Zhou
X J
XJ