Bound state properties of magnon-exciton hybrid in CrSBr

Magnetic semiconductors provide a unique platform for exploring the interplay between electronic and magnetic degrees of freedom relevant to spintronic technologies. Chromium sulfur bromide (CrSBr) is a layered van der Waals magnet, which is an antiferromagnetic semiconductor in the bulk, with monolayer ferromagnetism. This chromium chalcogenide halide compound organizes in an orthorhombic lattice that has Cr³⁺ ions which can give rise to magnons. When probed with x-rays, the energy of the beam can generate Frenkel excitons in CrSBr. Thus, there is a possibility of magnon-exciton hybridization to form a bound state. We investigate the magnon-exciton bound state solutions for CrSBr using a magnon-exciton interaction Hamiltonian for one-magnon and one-exciton, in the case of spin-allowed excitons. We investigate the presence of bound states by applying Oguchi's method for two-magnon bound state. We study the bound state properties, first for a chain direction in CrSBr, before investigating the planar and the bulk case.