Linear negative magnetoresistance in two-dimensional Lorentz gases
| Autor: | Ulf Gennser, Thomas Heinzel, H. W. Schumacher, T. Heckenthaler, J. Schluck, Jürgen Horbach, Dimitrios Kazazis, Klaus Pierz, Dominique Mailly, Nima H. Siboni, M. Hund |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Number density Condensed matter physics Magnetoresistance Lorentz transformation Theoretical models 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetic field Weak localization symbols.namesake Obstacle 0103 physical sciences symbols 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B |
| ISSN: | 2469-9950 |
| DOI: | 10.1103/PhysRevB.97.115301 |
| Popis: | Two-dimensional Lorentz gases formed by obstacles in the shape of circles, squares, and retroreflectors are reported to show a pronounced linear negative magnetoresistance at small magnetic fields. For circular obstacles at low number densities, our results agree with the predictions of a model based on classical retroreflection. In extension to the existing theoretical models, we find that the normalized magnetoresistance slope depends on the obstacle shape and increases as the number density of the obstacles is increased. The peaks are furthermore suppressed by in-plane magnetic fields as well as by elevated temperatures. These results suggest that classical retroreflection can form a significant contribution to the magnetoresistivity of two-dimensional Lorentz gases, while contributions from weak localization cannot be excluded, in particular for large obstacle densities. |
| Databáze: | OpenAIRE |
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