Closely separated one-dimensional wires
| Autor: | Michelle Y. Simmons, I. M. Castleton, J. E. F. Frost, Alex R. Hamilton, David A. Ritchie, Michael Pepper, A. G. Davies |
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| Rok vydání: | 1998 |
| Předmět: |
Surface (mathematics)
Materials science Condensed matter physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Thermal conduction Electronic Optical and Magnetic Materials Ballistic conduction Compressibility Density of states Ballistic conduction in single-walled carbon nanotubes Electrical and Electronic Engineering Double quantum Wave function |
| Zdroj: | Physica B: Condensed Matter. :157-161 |
| ISSN: | 0921-4526 |
| Popis: | We report the experimental study of a system comprising two parallel quasi-one-dimensional (1D) ballistic wires formed in a GaAs-Al x Ga 1− x As double quantum well structure. A unique surface gate geometry allows the device to be tuned smoothly from a configuration comprising a pair of vertically aligned 1D ballistic wires, to a single 1D ballistic wire in either the upper or lower 2DES. We investigate coupled ballistic conduction in two samples with contrasting wire separations (35 and 300 A). The strongly coupled sample exhibits a cross-over from double to single wire conduction as the number of occupied 1D subbands is reduced. The weakly coupled sample is used to observe directly variations in the compressibility of a single ballistic channel arising from the discrete 1D density of states. |
| Databáze: | OpenAIRE |
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