Conductance quantization and shot noise of a double-layer quantum point contact
| Autor: | Yoshiro Hirayama, Meydi Ferrier, Shota Norimoto, Akira Fukuda, Daiju Terasawa, Tomonori Arakawa, Kensuke Kobayashi |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Fano factor Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Transconductance Quantum point contact Shot noise FOS: Physical sciences Conductance 02 engineering and technology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology 01 natural sciences Quantization (physics) Dispersion relation Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Potential gradient 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 101 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.101.115401 |
| Popis: | The conductance quantization and shot noise below the first conductance plateau $G_0 = 2e^2/h$ are measured in a quantum point contact fabricated in a GaAs/AlGaAs tunnel-coupled double quantum well. From the conductance measurement, we observe a clear quantized conductance plateau at $0.5G_0$ and a small minimum in the transconductance at $0.7 G_0$. Spectroscopic transconductance measurement reveals three maxima inside the first diamond, thus suggesting three minima in the dispersion relation for electric subbands. Shot noise measurement shows that the Fano factor behavior is consistent with this observation. We propose a model that relates these features to a wavenumber directional split subband due to a strong Rashba spin--orbit interaction that is induced by the center barrier potential gradient of the double-layer sample. 13 pages, 16 figures, 74 references |
| Databáze: | OpenAIRE |
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