A long‐standing pursuit in materials science is to identify suitable magnetic semiconductors for integrated information storage, processing, and transfer. Van der Waals magnets have brought forth new material candidates for this purpose. Recently, sharp exciton resonances in antiferromagnet NiPS3 have been reported to correlate with magnetic order, that is, the exciton photoluminescence intensity diminishes above the Néel temperature. Here, it is found that the polarization of maximal exciton emission rotates locally, revealing three possible spin chain directions. This discovery establishes a new understanding of the antiferromagnet order hidden in previous neutron scattering and optical experiments. Furthermore, defect‐bound states are suggested as an alternative exciton formation mechanism that has yet to be explored in NiPS3. The supporting evidence includes chemical analysis, excitation power, and thickness dependent photoluminescence and first‐principles calculations. This mechanism for exciton formation is also consistent with the presence of strong phonon side bands. This study shows that anisotropic exciton photoluminescence can be used to read out local spin chain directions in antiferromagnets and realize multi‐functional devices via spin‐photon transduction.

No abstract

InSe layered semiconductors with high mobility have advantages over the transition-metal dichalcogenides in certain device applications. Understanding the dynamics of carriers, especially around the major bandgap, is not only of...

The network congestion is caused by the rapidly growing data traffic and the limited wireless radio resources. In addition to the licensed spectrum, the access to unlicensed spectrum (e.g., LAA) brings hope for the service provider (SP) to mitigate the deficiency of radio resources. The premium peering deal with the content providers (CPs) can be an approach to efficiently allocate the scarce radio resources to the CPs with higher traffic load and QoS requirement. This work contributes to a content premium pricing framework for one SP and several CPs, where the SP possesses both LTE and LAA. Through the four-stage Stackelberg game, job market signaling game and second price auction, we derive the optimal bandwidth demand of each CP, the optimal amounts of licensed bandwidth and unlicensed bandwidth required by the SP, the premium access fee and basic access fee. Analysis shows that the CPs and the SP all benefit from the premium access deal. Furthermore, there is a tradeoff between improvement and variability of the SP's profit when introducing LAA.