Fig. 1: Magneto-exciton effect of NiPS3 with external field direction along a axis.
From: Unveiling the spin evolution in van der Waals antiferromagnets via magneto-exciton effects
a Top view of lattice and spin structure of an NiPS3 single layer. The crystal orientations (a, b and c axes) are denoted by brown arrows, with the spin orientation primarily along the a axis of the crystal. The black arrow indicates the direction of the applied magnetic field, characterized by the angle θ relative to the a axis of the crystal in the Voigt geometry. b PL spectrum from exfoliated NiPS3 flakes excited by a 532-nm continuous-wave laser at 1.6 K. The sharp excitonic peak is labeled as X, accompanied by two small side peaks labeled as Sα and Sβ. The inset displays an optical microscopy image of exfoliated NiPS3 flakes on a SiO2/Si substrate, with the red point indicating the area where the signal was collected. c Magnetic-field-dependent PL color map of NiPS3 with the external field applied along a axis in the range from −31 to 31 T. d Magnetic-field-dependent PL spectra of NiPS3 with the external field applied along a axis in the range from 0 to 31 T. e Energy shift of the splitting excitonic peaks, X+ (ΔEX+) and X- (ΔEX-), as a function of the magnitude of the applied field. f Full width at half maximum (FWHM) of the excitonic emission as a function of the magnitude of applied field. Error bars represent standard errors from fitting function.
