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首页> 外文期刊>Optics Letters >Quantum beat between two excitonic levels split by spin-orbit interactions in the oxychalcogenide LaCuOS
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Quantum beat between two excitonic levels split by spin-orbit interactions in the oxychalcogenide LaCuOS

机译:氧硫族化物LaCuOS中自旋轨道相互作用分裂的两个激子能级之间的量子跳动

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Degenerate four-wave mixing signals excited by femtosecond laser pulses were measured in LaCuOCh (Ch=S and Se) at 4 K. The signals for LaCuOS exhibit a beat structure with a period of 480 fs just at the exciton peak energy, indicating that the lowest exciton states are split by 9 meV, but no beat structure was observed in LaCuOSe, regardless of the laser's energy. The spin-orbit interaction of the Ch ion accompanied by the hybridization of Cu 3d orbitals causes splitting of the exciton levels. Furthermore, the contribution of Ch p orbitals in the valence band maximum is larger in LaCuOSe owing to increased covalency in the Cu—Ch bond when S is replaced with Se.
机译:在4 K的LaCuOCh(Ch = S和Se)中,测量了由飞秒激光脉冲激发的简并四波混合信号。LaCuOS信号仅在激子峰值能量处表现出周期为480 fs的拍结构。最低的激子态被9 meV分割,但无论激光能量如何,在LaCuOSe中都没有观察到节拍结构。 Ch离子的自旋轨道相互作用以及Cu 3d轨道的杂化导致激子能级分裂。此外,由于用S取代Se时Cu-Ch键的共价性增加,因此LaCuOSe中价带最大的Ch p轨道的贡献更大。

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