Controllable asymmetric diffraction grating with PT symmetry in quantum dot molecules Yongsheng Hu, Ruijin Sun, Guangling Cheng and Aixi Chen Eur. Phys. J. Plus, 137 6 (2022) 690 Published online: 14 June 2022 DOI: 10.1140/epjp/s13360-022-02877-3