氢键链中孤子与杂质的相互作用

SOLITONIMPURITY INTERACTION IN A HYDROGENBONDED CHAIN

研究了带有对称双阱势的氢键链中孤子与杂质的相互作用．排斥型杂质对孤子提供一个势垒，吸引型杂质对孤子提供一个势阱，并且吸引型杂质获取孤子的能量形成局域振荡模．被杂质散射的孤子存在一个临界速度．只有入射速度大于临界速度的孤子才能穿越排斥型杂质。

The interaction of the soliton with an impurity is studied in a hydrogenbonded chain with symmetric doublewell potential. A repulsiontype impurity offer a potential barrier for the incident soliton, but an attractiontype impurity offer a potential well for the incident soliton and acquire energy of the soliton so that a localized oscillation mode is formed. There is a critical velocity for the soliton scattering by impurities. The soliton which possess higher velocity than the critical one may pass through a repulsiontype impurity or can't be captured by an attractiontype impurity.