Dipolar interactions between localized interlayer excitons in van der Waals heterostructures
Dipolar interactions between localized interlayer excitons in van der Waals heterostructures
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DOI：
10.1038/s41563-020-0661-4
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发表时间：
2020-04-13
期刊：
影响因子：
41.2
通讯作者：
Srivastava, Ajit
中科院分区：
文献类型：
--
作者：
Li Weijie;Lu Xin;Srivastava, Ajit
虽然自由空间中的光子几乎不相互作用，但物质可以介导它们之间的相互作用，从而导致光学非线性。单量子水平上的这种相互作用导致了现场光子排斥，这对于基于光子的量子信息处理和实现光的强相互作用多体态至关重要。在这里，我们报告排斥偶极-偶极相互作用电场可调，本地化层间激子在MoSe 2/WSe 2异质双层。一个单一的，本地化的激子与面外，非振荡的偶极矩的存在下，增加了第二次激发的能量由类似于2毫电子伏-一个数量级大于发射线宽和对应于一个类似于7纳米的偶极间距离。在较高的激发功率下，多激子复合物以系统较高的能量出现。的磁场依赖性的发射极化是一致的自旋谷单重态性质的偶极分子状态。我们的发现代表了一个步骤，创造激子的少体和多体状态，如偶极晶体与自旋谷旋量在货车德瓦尔斯异质结构。
Although photons in free space barely interact, matter can mediate interactions between them resulting in optical nonlinearities. Such interactions at the single-quantum level result in an on-site photon repulsion, crucial for photon-based quantum information processing and for realizing strongly interacting many-body states of light. Here, we report repulsive dipole-dipole interactions between electric field-tuneable, localized interlayer excitons in the MoSe2/WSe2 heterobilayer. The presence of a single, localized exciton with an out-of-plane, non-oscillating dipole moment increases the energy of the second excitation by similar to 2 meV-an order of magnitude larger than the emission linewidth and corresponding to an inter-dipole distance of similar to 7 nm. At higher excitation power, multi-exciton complexes appear at systematically higher energies. The magnetic field dependence of the emission polarization is consistent with the spin-valley singlet nature of the dipolar molecular state. Our finding represents a step towards the creation of excitonic few- and many-body states such as dipolar crystals with spin-valley spinor in van der Waals heterostructures.