Method for measuring magnetic photocurrent caused by Lamor precession in topological insulator Bi2Te3

The invention relates to a method for measuring magnetic photocurrent caused by Lamor precession in a topological insulator Bi2Te3. The method comprises the following steps of applying a magnetic field along an x direction in a plane to a three-dimensional topological insulator Bi2Te3, vertically irradiating (along a z direction) laser of 1064nm on a midpoint of a connecting line of two electrodes on a sample, and exciting to generate magnetic photocurrent. Photocurrents in different polarization states are obtained by rotating a quarter-wave plate, and then magnetic photocurrents caused by Ramor precession excited by circularly polarized light are obtained through formula fitting. According to the principle, the circularly polarized light is excited to generate spin polarization Sz in the vertical direction, the magnetic field in the x direction enables the spin polarization Sz generated in the topological insulator to generate Lamor precession, and therefore spin polarization Sy in the y direction is genera