数值研究了实部具有缺陷的parity-time(PT)对称光晶格中的缺陷暗孤子。 当衍射与自散焦非线性效应 平衡时,暗孤子能够被获得;当自散焦介质中的PT对称光晶格实部被附加一个缺陷后,缺陷暗孤子也能够被获得。数值结果显示：缺陷暗孤子可以在很大参数范围内存在并能稳定传 播;PT对称光晶格实部附加的缺陷强度有一最大值,超过此值缺陷暗孤子不存 在;PT对称光晶格的虚部振幅对缺陷暗孤子的稳定性有影响。

Defect dark solitons were numerically researched in parity-time-symmetric optical lattices with an additional defect in the real part. When the diffraction is balanced with the self-defocusing nonlinear effect,dark solitons can be obtained. When a defect is added in the real part of parity-time-symmetric optical lattices,defect dark solitons can also be obtained. Numerical results showed that defect dark solitons can exist and be stable in large parameters range. The strength of additional defect has a maximum value,and the defect dark solitons do not exist above this value. The amplitude of the imaginary part of parity-time-symmetric optical lattices can affect the stability of the defect dark solitons.