(a) Polarization-dependent d I / d V spectra measured at the geometric center of a vortex under a magnetic field of 0.1 T and temperature of 40 mK on a 5-QL Bi₂Te₃/NbSe₂ sample. B controls the spin direction of a Majorana zero mode, while M is the spin-polarization direction of the tip. When the polarizations are parallel between the tip and the Majorana zero mode, the intensity of the zero-bias peak is enhanced, and when the polarizations are antiparallel, the intensity is suppressed. Panels (b) shows similar spectra to panel (a) but measured on a 3-QL Bi₂Te₃/NbSe₂ sample. No polarization-dependent zero-bias peak intensity of d I / d V contrast can be observed. All panels are reproduced from Ref. [123].