Quantum-mechanical propagation of electrons through a kink and the Anderson-localization problem
| Autor: | J. Bar-Touv, Yshai Avishai |
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| Rok vydání: | 1990 |
| Předmět: | |
| Zdroj: | Physical Review B. 42:11496-11504 |
| ISSN: | 1095-3795 0163-1829 |
| Popis: | The localization characteristics of quantum-mechanical propagation of electrons through a disordered mesoscopic system are emulated in the simple geometry of a rectangular kink. The Landauer-Buttiker prescription and transfer-matrix method are combined in solving the corresponding Anderson-localization problem. The strong localization, which characterizes a one-dimensional system, the weak localization in a two-dimensional system, and universal conductance fluctuations are found to be compatible with the predictions of single-parameter scaling theory. Conductance fluctuations are also found in the emulation of conductance in the ballistic regime. These chaotic fluctuations are interpreted as a complex spectrum of resonating electron waves within a waveguide. The statistical distribution of fluctuations due to different realizations of the disorder in systems of identical macroscopic characteristics is also investigated. The significant deviations from a normal Gaussian distribution implied by the one-parameter scaling theory indicate the inadequacy of that theory and the need for higher-order corrections. |
| Databáze: | OpenAIRE |
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