Many-body Hybrid Excitons with strong molecular orientation dependence in Organic-Inorganic van der Waals Heterostructures

• DOI: 10.48550/arxiv.2301.02523
• Publication Date: 2023-01-01
• Authors: Shaohua Fu; Jianwei Ding; Haifeng Lv; Shuangyan Liu; Kun Zhao; Zhiying Bai; Dawei He; Rui Wang; Jimin Zhao; Xiaojun Wu; Dongsheng Tang; Xiaohui Qiu; Yongsheng Wang; Xiaoxian Zhang
• Keywords: HOMO/LUMO; Biexciton

The coherent many-body interaction at the organic-inorganic interface can give rise to intriguing hybrid excitons that combine advantages of Wannier-Mott and Frenkel simultaneously. Unlike 2D inorganic heterostructures suffer from moment mismatch, formed have a momentum-direct nature, which yet be explored. Here, we report copper phthalocyanine/molybdenum diselenide (CuPc/MoSe2) with strong molecular orientation dependence using low-temperature photoluminescence spectroscopy. new emission peaks observed in CuPc/MoSe2 heterostructure indicate formation interfacial excitons. density functional theory (DFT) calculation confirms hybridization between lowest unoccupied orbital (LUMO) CuPc conduction band minimum (CBM) MoSe2, suggesting consist electrons extended both layers holes confined individual layers. temperature-dependent measurements show gain signatures MoSe2 out-of-plane is used tailor exciton states. Our results reveal tunability by orientation, suggests emerging promising platform for physics.