Magnon-mediated exciton-exciton interaction in a van der Waals antiferromagnet

Abstract

Excitons are fundamental excitations that govern the optical properties of semiconductors. Interacting excitons can lead to various emergent phases of matter and large nonlinear optical responses. In most semiconductors, excitons interact via exchange interaction or phase space filling. Correlated materials that host excitons coupled to other degrees of freedom offer hitherto unexplored pathways for controlling these interactions. Here, we demonstrate magnon-mediated excitonic interactions in CrSBr, an antiferromagnetic semiconductor. This interaction manifests as the dependence of exciton energy on exciton density via a magnonic adjustment of the spin canting angle. Our study demonstrates the emergence of quasiparticle-mediated interactions in correlated quantum materials, leading to large nonlinear optical responses and potential device concepts such as magnon-mediated quantum transducers.

33 pages, 14 figures

References in corpus (8)

• Observation of Superfluidity of Polaritons in Semiconductor Microcavities
• Evidence of high-temperature exciton condensation in 2D atomic double layers
• Evidence for an excitonic insulator phase in 1T-TiSe${}_2$
• Wigner supersolid of excitons in electron-hole bilayers
• Paramagnetic Electronic Structure of CrSBr: Comparison between Ab Initio GW Theory and Angle-Resolved Photoemission Spectroscopy
• Giant exchange splitting in the electronic structure of A-type 2D antiferromagnet CrSBr
• Tunable effective masses of magneto-excitons in two-dimensional materials
• Magnetically-dressed CrSBr exciton-polaritons in ultrastrong coupling regime

Cited by in corpus (12)

• Distinct Magneto-Optical Response of Frenkel and Wannier Excitons in CrSBr
• Interplay of energy and charge transfer in WSe2/CrSBr heterostructures
• Surface-Dominated Quantum Metric-Induced Nonlinear Transport in the Layered Antiferromagnet CrSBr
• Tunable Nanophotonic Devices and Cavities based on a Two-Dimensional Magnet
• Magnetic Correlation Spectroscopy in CrSBr
• Directional Flow of Confined Polaritons in CrSBr
• Interplay of vibrational, electronic, and magnetic states in CrSBr
• Quasiparticle Description of Angle-Resolved Photoemission Spectroscopy for SrCuO2
• Boltzmann transport theory of magnon-exciton drag
• Theory of interaction-induced charge order in CrSBr
• Excitonic optical absorption in strained monolayer CrSBr
• Magnetic Field-Tunable Repulsive Exciton-Exciton Interaction in the van der Waals Antiferromagnet NiPS${}_3$