Department of Physics, Harbin Institute of Technology, Harbin 150001, China.
Opt Lett. 2010 Sep 1;35(17):2928-30. doi: 10.1364/OL.35.002928.
Defect modes are studied in parity-time (PT) symmetric periodic complex potentials for both positive and negative defects. Such new kinds of linear localized modes may conserve their energy or endure gain or loss upon propagating. The existence domain of the conserved modes would be prolonged by positive defects or shortened by negative defects, and the dissipative modes would appear before the phase transition point of the PT symmetric potential at stronger negative defects.
研究了宇称时间（PT）对称周期复势中正负缺陷的缺陷模式。这种新的线性局域模式在传播时可能会保持能量或经受增益或损耗。正缺陷会延长守恒模式的存在域，而负缺陷会缩短；在更强的负缺陷下，PT 对称势的相变点之前会出现耗散模式。
