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Creators/Authors contains: "Roubos, A"

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  1. ; ; ; ; ; (, Physical Review B)
    This paper reports the discovery that resistively-coupled coplanar waveguides in van der Waals heterostructures are dominated by Hall conductivity rather than longitudinal conductivity, unlike traditional capacitively-coupled systems. We observed clear integer quantum Hall effect plateaus that were frequency-independent from below 1 GHz to over 7 GHz, with sensitivity strongly dependent on device geometry. We developed a T-network circuit model that successfully explains the nearly threefold enhancement in measurement sensitivity observed in samples with long contact regions compared to theoretical predictions. This work establishes important design principles for microwave measurements of two-dimensional electron systems in van der Waals materials and opens pathways for contactless characterization of materials where Ohmic contacts are challenging to achieve. 
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