Wave Transport in One-Dimensional Disordered Systems with Finite-Size Scatterers
| Autor: | Diaz, Marlos, Mello, Pier A., Yepez, Miztli, Tomsovic, Steven |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Physical Review B 91, 184203 (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.91.184203 |
| Popis: | We study the problem of wave transport in a one-dimensional disordered system, where the scatterers of the chain are $n$ barriers and wells with statistically independent intensities and with a spatial extension $\l_c$ which may contain an arbitrary number $\delta/2\pi$ of wavelengths, where $\delta = k l_c$. We analyze the average Landauer resistance and transmission coefficient of the chain as a function of $n$ and the phase parameter $\delta$. For weak scatterers, we find: i) a regime, to be called I, associated with an exponential behavior of the resistance with $n$, ii) a regime, to be called II, for $\delta$ in the vicinity of $\pi$, where the system is almost transparent and less localized, and iii) right in the middle of regime II, for $\delta$ very close to $\pi$, the formation of a band gap, which becomes ever more conspicuous as $n$ increases. In regime II, both the average Landauer resistance and the transmission coefficient show an oscillatory behavior with $n$ and $\delta$. These characteristics of the system are found analytically, some of them exactly and some others approximately. The agreement between theory and simulations is excellent, which suggests a strong motivation for the experimental study of these systems. We also present a qualitative discussion of the results. Comment: 12 Figures. Submitted to Physical Review B |
| Databáze: | arXiv |
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