A quantitative study of spin-flip co-tunneling transport in a quantum dot
| Autor: | Anh T. Ngo, Andrei Kogan, Steven Herbert, Sergio E. Ulloa, Tai-Min Liu, Bryan Hemingway, Michael R. Melloch |
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| Rok vydání: | 2011 |
| Předmět: |
Physics
Zeeman effect Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Field (physics) Conductance Coulomb blockade FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences Electronic Optical and Magnetic Materials symbols.namesake Quantum dot 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) symbols Spin-flip Microscopic theory 010306 general physics 0210 nano-technology Quantum tunnelling |
| DOI: | 10.48550/arxiv.1110.5924 |
| Popis: | We report detailed transport measurements in a quantum dot in a spin-flip co-tunneling regime, and a quantitative comparison of the data to microscopic theory. The quantum dot is fabricated by lateral gating of a GaAs/AlGaAs heterostructure, and the conductance is measured in the presence of an in-plane Zeeman field. We focus on the ratio of the nonlinear conductance values at bias voltages exceeding the Zeeman threshold, a regime that permits a spin flip on the dot, to those below the Zeeman threshold, when the spin flip on the dot is energetically forbidden. The data obtained in three different odd-occupation dot states show good quantitative agreement with the theory with no adjustable parameters. We also compare the theoretical results to the predictions of a phenomenological form used previously for the analysis of non-linear co-tunneling conductance, specifically the determination of the heterostructure g-factor, and find good agreement between the two. Comment: 5 pages, 5 figures |
| Databáze: | OpenAIRE |
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