Exciton-magnon structure of the optical absorption spectrum of antiferromagnetic MnPS3

Abstract

In the region of the A1g6(S6)→A1g4,Eg4(G4) optical transition, the absorption spectrum of the quasi-two-dimensional antiferromagnet MnPS3 has an exciton-magnon structure. It includes a pure exciton line with a wave number of 21223.5cm−1 and an exciton-magnon band with a peak at 21328cm−1 for T=1.7K. The spectra are studied at temperatures ranging from 1.7to80K and with external magnetic fields up to 60kOe. In a magnetic field oriented along the easy axis z, splitting of the exciton line is observed owing to the nonequivalence of the magnetic sublattices with respect to an external field. The behavior of the split components in the region of the spin-orientation transition (35–41kOe) is typical of second order phase transitions.

Highly anisotropic excitons and multiple phonon bound states in a van der Waals antiferromagnetic insulator

“…Excitons coupled to magnetic order have been studied in several intrinsic magnetic insulators. For instance, in bulk crystals with Néel antiferromagnetic ordering, Davydov splitting resulting from the coupling of localized excitons in adjacent magnetic ions has been extensively studied [11][12][13][14] . Coupling of the electronic structure to magnetic order has also led to strong exciton-magnon coupling 10,14 and drastic tunability of excitonic photoluminescence by a magnetic field 13 .…”

“…For instance, in bulk crystals with Néel antiferromagnetic ordering, Davydov splitting resulting from the coupling of localized excitons in adjacent magnetic ions has been extensively studied [11][12][13][14] . Coupling of the electronic structure to magnetic order has also led to strong exciton-magnon coupling 10,14 and drastic tunability of excitonic photoluminescence by a magnetic field 13 . In quantum well structures, dilute magnetic semiconductors have served as a testbed for exploring magneto exciton physics.…”

Exciton-driven antiferromagnetic metal in a correlated van der Waals insulator

“…The lack of a nonequilibrium response can be understood by examining optical absorption data for these compounds. Unlike NiPS 3 , which exhibits sharp spin-orbit-entangled excitons in the vicinity of our pump photon energy [5], MnPS 3 and FePS 3 are purely transparent at 1.55 eV, with on-site d-d transitions lying elsewhere and the optical charge-transfer gap at higher energies (E gap ∼ 2.9 eV for MnPS 3 and ∼ 1.8 eV for FePS 3 at low temperature) [33][34][35][36][37][38]. Supplementary Note 2: Details of the photoexcitation scheme in our ultrafast NiPS 3 measurements…”

The role of dispersion interactions in the stability of structures layered antiferromagnetic MnPS₃

“…Така будова надає можливість проводити інтеркаляцію вихідного матеріалу різними неорганічними молекулами [2], без суттєвої зміни кристалографічної структури вихідної матриці. Зокрема, для кристалу MnPS3 було проведено ряд таких експериментальних досліджень, як дослідження магнітних властивостей [3], оптичних параметрів [4], динаміки гратки [5], а також баричної поведінки ряду фізичних параметрів [6].…”