DISORDER IN THE DISCRETE NONLINEAR SCHRODINGER-EQUATION

被引:37
|
作者
MOLINA, MI
TSIRONIS, GP
机构
[1] UNIV N TEXAS,DEPT PHYS,DENTON,TX 76203
[2] UNIV CHILE,FAC CIENCIAS,DEPT FIS,SANTIAGO,CHILE
[3] UNIV CRETE,DEPT PHYS,GR-71110 IRAKLION,GREECE
[4] RES CTR CRETE,GR-71110 IRAKLION,GREECE
来源
INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 1995年 / 9卷 / 16期
关键词
D O I
10.1142/S021797929500077X
中图分类号
O59 [应用物理学];
学科分类号
摘要
We study the interplay of disorder and nonlinearity in condensed matter systems modeled by the paradigmatic discrete nonlinear Schrodinger equation and focus on selftrapping and transport properties. We start by analyzing the two most simple nonlinear disordered systems, viz. a nondegenerate nonlinear dimer and a perturbed degenerate dimer. We then consider the case of few nonlinear impurities embedded in a linear host and treat the stationary problem analytically. We conclude by examining the case of a one-dimensional nonlinear random binary alloy where we find absence of quasiparticle localization, except for large nonlinearity parameter values. The transmission of plane waves across a disordered nonlinear segment of this type shows a power-law decay as a function of the segment size.
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页码:1899 / 1932
页数:34
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