Zhanyu Ma

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Charge Kondo circuits consist of metallic islands connected by single-mode quantum point contacts
(QPCs). The island’s charging energy makes these circuits tunable quantum simulators of
various strongly interacting models. Here we propose a circuit that realizes the Kondo effect with
effective Luttinger-liquid interactions, and show that it undergoes a localization transition in which
the QPC transmission is fully suppressed below a critical value. Experimental signatures include
a diverging charge susceptibility and an entropy step. Our findings open a path toward realizing
localization transitions in more exotic settings.

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Tel Aviv University
0.03
Contact: Fabian Kugler