中文摘要：

用数值方法证实了亮、暗屏蔽光伏孤子在有外加电场的LiNbO3晶体中都可以发生大自偏转,并验证了这种自偏转现象不但与晶体中受主浓度NA有关而且还与外加电场E0有关.在E0相同的条件下,NA越小这种自偏转现象越明显,在NA相同的条件下,E0越大自偏转现象越明显.还发现亮、暗屏蔽光伏孤子的自偏转现象不同：亮屏蔽光伏孤子整体都发生明显偏转,暗屏蔽光伏孤子的偏转只是发生在一侧,其极值位置和另一侧几乎不发生偏转.

英文摘要：

We demonstrate large self-deflection of both bright and dark screening photovoltaic solitons existing in LiNbO3 crystal under an external applied field with numerical method, and we also demonstrate that the self-deflection is not only connected with the acceptor concentration NA but also with the external applied field E0 . Under the same E0 , when NA is lower, the self-deflection is more obvious. Under the same NA , when Eo is higher, the self-deflection is more obvious. We also find that self-deflection of the bright screening spatial soliton and that of the dark one are different： the bright screening photovohaic soliton defects obviously; while only one side of the dark soliton deflects, its extreme value point and the other side almost do not deflect.