The fractional angular momentum realized by a neutral cold atom Jian Jing, Qiu-Yue Zhang, Qing Wang, Zheng-Wen Long and Shi-Hai Dong Eur. Phys. J. C, 79 1 (2019) 1 Published online: 03 January 2019 DOI: 10.1140/epjc/s10052-018-6506-5