English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Halide perovskite materials raised tremendous interest in recent years sincetheir cheap fabrication, superior performance in both solar cell and lightemitting diode (LED). Due to the existence of layered quantum well structure,quasi two-dimensional(2D) halide perovskite has more intriguing spin relatedphysics than its 3D counterpart. For instance, the detection and brightening ofdark exciton (DX) in 2D halide perovskite attracts much attention since thesespecies can be used in opto-spintronic and quantum computing devices. Here, wereport the gradually brightened emission of the DX at 2.33 eV with thethickness decreases in (PEA)2PbI4 single crystalline nanoflake, which hithertohas not been reported. By coupling with in-plane (IP) magnetic field in Voigtconfiguration, the DX emission can be sharply enhanced, while for theout-of-plane (OP) magnetic field in Faraday configuration, the DX emission hasno noticeable change, which can be reconciled with the theory interpretation ofmagnetic field dependent wave function mixing between the four exciton statesfi1, fi2, fi3- , fi3+. The emission of DX fi2 at 2.335 eV and the finesplitting of all the four states are observed in static PL spectroscopy for thefirst time. Our work thus clarifies the debating questions regarding toprevious research on DX behavior in 2D halide perovskite material and shedslight on the road of realizing opto-spintronic or quantum computing deviceswith these materials.

Thickness dependent dark exciton emission in (PEA)2PbI4 nanoflake and its brightening by in-plane magnetic field