In this paper, we investigate two-dimensional parity-time (PT) symmetry and electromagnetically induced grating (EIG) in four-level asymmetric triple quantum wells (QWs). Here, PT-symmetry and EIG are realized by appropriately varying the detuning value of the probe, and the modulation amplitudes of a coupling field and standing wave (SW) pump. By virtue of its PT symmetry, the EIG asymmetrically diffracts the probe beam. The angular switching of the diffracted beam can be achieved either by varying the probe or the coupling and SW pump fields. The intensity distribution of the diffracted beam over higher-order diffraction peaks depends on the interaction length in the QW. For small interaction lengths, most of the energy is distributed close to the central diffraction peak. With an increase in the interaction length, energy is gradually transferred to higher order diffraction peaks.

在本文中，我们研究了四能级不对称三重量子阱 (QW) 中的二维奇偶校验时间 (PT) 对称性和电磁感应光栅 (EIG)。在这里，通过适当改变探头的失谐值以及耦合场和驻波 (SW) 泵的调制幅度来实现 PT 对称性和 EIG。凭借其 PT 对称性，EIG 不对称地衍射探测光束。衍射光束的角度切换可以通过改变探头或耦合和 SW 泵场来实现。衍射光束在高阶衍射峰上的强度分布取决于 QW 中的相互作用长度。对于小的相互作用长度，大部分能量分布在中心衍射峰附近。随着交互长度的增加，