AlO<italic>x</italic>/LiF composite protection layer for Cr-doped (Bi,Sb)2Te3 quantum anomalous Hall films

AlO_x/LiF composite protection layer for Cr-doped (Bi,Sb)₂Te₃ quantum anomalous Hall films

Ou Yunbo¹, Feng Yang², Feng Xiao^{1, 2}, Hao Zhenqi², Zhang Liguo², Liu Chang², Wang Yayu^{2, †,}, He Ke^{2, ‡,}, Ma Xucun², Xue Qikun²

Magnetic field dependence of (a) ρ_yx and (b) ρ_xx for bare (green lines) and Te-capped (blue lines) 5 QL Cr_0.15(Bi_0.1Sb_0.9)_1.85Te₃ films at 25 mK. The measurement is taken at the CNPs of bare (−6 V) and Te-capped (−32 V) films.