Fig. 1: Crystal structure and antiferromagnetic exciton state of NiPS3.
From: Manipulation of anisotropic Zhang-Rice exciton in NiPS3 by magnetic field
a Schematic of the spin orientation in a single layer of NiPS3. b Monoclinic stacking with ferromagnetic interlayer coupling in a bulk crystal. c Temperature-dependent reflection contrast spectra. The red curve denotes the reflection contrast spectra below the NĂ©el temperature, while the blue curve is above NĂ©el temperature. These peaks in the reflection contrast spectra are assigned to the X1 and X3 exciton. d Polarized PL spectra collected from the parallel and perpendicular directions to PL polarization, the linewidth of the PL spectra is about 260 μeV. The red line is the PL spectrum collected parallel to the PL polarization, while the blue line is perpendicular to the PL polarization. In the spectra, there is a main peak position at 1.476 eV (labeled as X1) and a shoulder peak position at 1.479 eV (labeled as X2).
