Surface spin magnetism controls the polarized exciton emission from CdSe nanoplatelets.,Nature Nanotechnology

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Surface spin magnetism controls the polarized exciton emission from CdSe nanoplatelets.
Nature Nanotechnology ( IF 38.1 ) Pub Date : 2020-01-27 , DOI: 10.1038/s41565-019-0631-7
Elena V Shornikova ₁ , Aleksandr A Golovatenko ₂ , Dmitri R Yakovlev _{1,

2} , Anna V Rodina ₂ , Louis Biadala ₃ , Gang Qiang ₁ , Alexis Kuntzmann ₄ , Michel Nasilowski ₄ , Benoit Dubertret ₄ , Anatolii Polovitsyn _{5,

6} , Iwan Moreels _{5,

6} , Manfred Bayer _{1,

2}

Affiliation

The surface of nominally diamagnetic colloidal CdSe nanoplatelets can demonstrate paramagnetic behaviour owing to the uncompensated spins of dangling bonds, as we reveal here by optical spectroscopy in high magnetic fields up to 15 T using the exciton spin as a probe of the surface magnetism. The strongly nonlinear magnetic field dependence of the circular polarization of the exciton emission is determined by the magnetization of the dangling-bond spins (DBSs), the exciton spin polarization as well as the spin-dependent recombination of dark excitons. The sign of the exciton-DBS exchange interaction depends on the nanoplatelet growth conditions.

中文翻译：

表面自旋磁性控制CdSe纳米片的极化激子发射。

正负磁性胶体CdSe纳米片的表面由于悬空键的自旋没有补偿而表现出顺磁行为，正如我们在这里使用激子自旋作为表面磁性的探针，在高达15 T的高磁场中通过光谱学揭示的那样。激子发射的圆极化的强非线性磁场依赖性取决于悬挂键自旋（DBSs）的磁化，激子自旋极化以及暗激子的自旋依赖复合。激子-DBS交换相互作用的迹象取决于纳米血小板的生长条件。

更新日期：2020-01-27

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