Anisotropic phonon and magnon vibration and gate-tunable optoelectronic properties of nickel thiophosphite

Abstract Transition metal phosphorus trichalcogenides retain spin-charge coupling and lattice vibrations in different layers, which are useful for spintronic optoelectronic devices. The phonon, magnons excitonic properties of two-dimensional ternary nickel-phosphorus trisulfides (NiPS 3 ) investigated using Raman spectroscopy photoluminescence (PL) study. With magnetic exchange interaction, an exotic phonon scattering degenerates the optical phonons into in-plane A g B modes. We have observed eight modes with two acoustic anisotropic magnon ( M 1 , 2 below critical temperature co-( XX ), while only at cross XY polarizations. mode is coupled that can survive after transition temperature. soften variations temperature, attributed to anharmonic phonon–phonon interlayer forces. polarized shows two-fold four-fold symmetry orientations modes, respectively, exhibit strong phonon/magnon. PL spectra revealed existence bound features ensemble emitters NiPS . robust excitation structural stability further optothermal properties. Moreover, fabricated field-effect transistor on reveals p -type semiconducting nature ON/OFF ratio 5 × 10 6 mobility ∼16.34 cm V −1 s In contrast, rectification indicates their diode characteristics. Similarly, photocurrent enhanced by changing wavelength light, potential optoelectronics. interaction provides new insights these materials’ magneto-optical thermal memory