Excitonic Phenomena in Two-dimensional Halide Perovskites

초록

Two-dimensional (2D) halide perovskites are layered organic-inorganic semiconductors that naturally form multiple-quantum-well structures. Owing to their strong quantum and dielectric confinements, soft anharmonic lattices, and wide compositional tunability, they exhibit a rich variety of excitonic phenomena. These unique characteristics make 2D halide perovskites an attractive platform for exploring fundamental exciton physics as well as emerging optoelectronic applications. This review summarizes recent advances in exciton physics and related phenomena in 2D halide perovskites, covering electronic structure, exciton fine structure, spin dynamics, biexcitons, polarons, and exciton polaritons. Particular emphasis is placed on dark-exciton-mediated biexciton formation, the importance of the 2δ correction in determining biexciton binding energies, and two-photon resonant Raman scattering via biexciton states. We further discuss exciton-phonon coupling, Huang-Rhys factors, self-trapped exciton emission, giant Rabi splitting, spin-dependent polariton interactions, and room-temperature polariton Bose-Einstein condensation. Together, these developments highlight the interplay among Coulomb interactions, lattice dynamics, spin physics, and strong light-matter coupling, establishing 2D halide perovskites as a versatile platform for both fundamental many-body physics and future excitonic and polaritonic devices.

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