Nonlinear Effect in Step Bunching Caused by Electric Current
Nonlinear Effect in Step Bunching Caused by Electric Current
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电流引起的阶跃聚束的非线性效应
DOI：
10.1143/jpsj.65.1515
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发表时间：
1996
影响因子：
1.7
通讯作者：
M. Uwaha
中科院分区：
文献类型：
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作者：
Masahide Sato;M. Uwaha
我们研究直流电流表面扩散场中阶梯聚束的非线性效应。线性稳定性分析表明，如果步距小于表面扩散长度，并且电流引起的吸附原子的漂移沿步降方向，则长波长升华时会出现聚束不稳定性。当我们考虑非线性效应时，台阶密度服从本尼方程，该方程显示了一系列台阶束或时空混沌。该特征类似于由阶跃动力学的不对称性引起的阶跃聚束，只不过表面轮廓可能随色散项的符号而变化。
We study nonlinear effects in step bunching in a surface diffusion field with a direct electric current. Linear stability analysis shows that the bunching instability occurs in sublimation at long wavelength if the step distance is smaller than the surface diffusion length and the drift of adatoms induced by the electric current is in the step down direction. When we take account of the nonlinear effect, the density of steps obeys the Benney equation, which shows an array of step bunches or spatiotemporal chaos. This feature is similar to the step bunching caused by the asymmetry of step kinetics except that the surface profile may change with the sign of the dispersion term.
M.Uwaha：“表面扩散场中一系列相互作用步骤的演化”
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