Asymmetric chiral coupling in a topological resonator
2023-06-19
Author(s): Shi, SS (Shi, Shushu); Xie, X (Xie, Xin); Yan, S (Yan, Sai); Yang, JN (Yang, Jingnan); Dang, JC (Dang, Jianchen); Xiao, S (Xiao, Shan); Yang, LL (Yang, Longlong); Dai, DJ (Dai, Danjie); Fu, BW (Fu, Bowen); Yuan, Y (Yuan, Yu); Zhu, R (Zhu, Rui); Su, XB (Su, Xiangbin); Liu, HQ (Liu, Hanqing); Zuo, ZC (Zuo, Zhanchun); Wang, C (Wang, Can); Ni, HQ (Ni, Haiqiao); Niu, ZC (Niu, Zhichuan); Gong, QH (Gong, Qihuang); Xu, XL (Xu, Xiulai)
Source: APPLIED PHYSICS LETTERS Volume: 122 Issue: 19 Article Number: 191104 DOI: 10.1063/5.0149671 Published: MAY 9 2023
Abstract: Chiral light-matter interactions supported by topological edge modes at the interface of valley photonic crystals provide a robust method to implement the unidirectional spin transfer. The valley topological photonic crystals possess a pair of counterpropagating edge modes. The edge modes are robust against the sharp bend of 60 degrees and 120 degrees, which can form a resonator with whispering gallery modes. Here, we demonstrate the asymmetric emission of chiral coupling from single quantum dots in a topological resonator by tuning the coupling between a quantum emitter and a resonator mode. Under a magnetic field in Faraday configuration, the exciton state from a single quantum dot splits into two exciton spin states with opposite circularly polarized emissions due to the Zeeman effect. Two branches of the quantum dot emissions couple to a resonator mode in different degrees, resulting in an asymmetric chiral emission. Without the demanding of site-control of quantum emitters for chiral quantum optics, an extra degree of freedom to tune the chiral contrast with a topological resonator could be useful for the development of on-chip integrated photonic circuits.
Accession Number: WOS:000984988700004
ISSN: 0003-6951
eISSN: 1077-3118
