Impurity effect on surface states of Bi (111) ultrathin films

Zhu Kai^{1, 2}, Tian Dai^{1, 2}, Wu Lin^{1, 2}, Xu Jianli^{1, 2}, Jin Xiaofeng^{1, 2, †,}

The extracted α value and phase coherence length l_φ as a function of temperature for both the pristine Bi (111) films and the films with surface impurities. (a) Solid dots for the pristine Bi films and open circles for the Bi films with Cu impurities. (b) Solid dots for the pristine Bi films and open circles for the Bi films with Fe impurities.