Figure 2: Photocurrent characteristics of the magnetic topological insulator thin film.
From: Zero-bias photocurrent in ferromagnetic topological insulator

(a) Zero-bias photocurrent at 250 meV (and 350 nJ) excitation under varying in-plane magnetic field By. (b) Normalized photocurrent under in-plane (By) and out-of-plane (Bz) magnetic fields, plotted together with the magnetization under By. (c) Photocurrent spectra at 20 K under By.