Xu Yushuo, Sun Dongyue, Huang Baibiao, Dai Ying, Wei Wei
School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
Nano Lett. 2025 Jan 22;25(3):1150-1157. doi: 10.1021/acs.nanolett.4c05592. Epub 2025 Jan 8.
In van der Waals (vdW) architectures of transition metal dichalcogenides (TMDCs), the coupling between interlayer exciton and quantum degrees of freedom opens unprecedented opportunities for excitonic physics. Taking the MoSe homobilayer as representative, we identify that the interlayer registry defines the nature and dynamics of the lowest-energy interlayer exciton. The large layer polarization () is proved, which ensures the formation of layer-resolved interlayer excitons. In particular, sliding ferroelectric polarization couples to the dipole orientation of the interlayer exciton, thus achieving the long-sought electric control of excitonic states. In line with the phase winding of the Bloch states under rotational symmetry, we clarify the valley optical circular dichroism, enriching the exciton valleytronics. We also elucidate the Hall effect of the layer- and valley-polarized interlayer excitons, which advances our understanding of the spatial transport properties of the composite particles and provides new insights into the exciton-based applications.
在过渡金属二硫属化物（TMDCs）的范德华（vdW）结构中，层间激子与量子自由度之间的耦合为激子物理学带来了前所未有的机遇。以MoSe同质双层为例，我们发现层间配准决定了最低能量层间激子的性质和动力学。证明了大的层极化（），这确保了层分辨层间激子的形成。特别地，滑动铁电极化与层间激子的偶极取向耦合，从而实现了长期以来所追求的激子态的电控制。与旋转对称性下布洛赫态的相位缠绕一致，我们阐明了谷光学圆二色性，丰富了激子谷电子学。我们还阐明了层极化和谷极化层间激子的霍尔效应，这加深了我们对复合粒子空间输运性质的理解，并为基于激子的应用提供了新的见解。
