Magneto-thermopower of a chaotic, ballistic quantum dot
| Autor: | S. F. Godijn, Hartmut Buhmann, Laurens W. Molenkamp, S. Möller |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Physics
Statistical ensemble Condensed matter physics Chaotic Heterojunction Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Electronic Optical and Magnetic Materials Quantum dot Seebeck coefficient Quantum mechanics Electrical and Electronic Engineering Magneto Random matrix Sign (mathematics) |
| Zdroj: | Physica B: Condensed Matter. :198-202 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/s0921-4526(98)00515-8 |
| Popis: | We present measurements of the magneto-thermopower fluctuations of a gate-defined, chaotic quantum dot in a (Al,Ga)As-semiconductor heterostructure. Current-heating techniques were employed to build up the necessary temperature difference across the quantum dot for the thermopower measurement. A statistical ensemble is generated by registering the magnetic-field and gate-voltage dependence for a number of slightly different dot sizes. The experimental results are in good agreement with the predicted non-gaussian distribution of the Random Matrix Theory. To our knowledge these are the first transport experiments that directly yield the non-gaussian distribution which are an unambiguous sign for the occurence of chaos. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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