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Counting Statistics of Single Electron Transport in Bilayer Graphene Quantum Dots

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arxiv 2210.07759 v2 pith:U7C7XWC6 submitted 2022-10-14 cond-mat.mes-hall

Rebekka Garreis , Jonas Daniel Gerber , Veronika Stará , Chuyao Tong , Carolin Gold , Marc Röösli , Kenji Watanabe , Takashi Taniguchi
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Klaus Ensslin Thomas Ihn Annika Kurzmann
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classification cond-mat.mes-hall
keywords quantumgraphenemeasurenoisebilayercurrentelectronmethod
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We measure telegraph noise of current fluctuations in an electrostatically defined quantum dot in bilayer graphene by real-time detection of single electron tunneling with a capacitively coupled neighboring quantum dot. Suppression of the second and third cumulant (related to shot noise) in a tunable graphene quantum dot is demonstrated experimentally. With this method we demonstrate the ability to measure very low current and noise levels. Furthermore, we use this method to investigate the first spin excited state, an essential prerequisite to measure spin relaxation.

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