Dispersive sensing of charge states in a bilayer graphene quantum dot

We demonstrate dispersive readout of individual charge states in a gate-defined few-electron quantum dot bilayer graphene. employ radio frequency reflectometry circuit, where an LC resonator with resonance close to 280 MHz is directly coupled Ohmic contact the device. The detection scheme based on changes capacitance operates over wide gate-voltage range and allows us probe excited down single-electron regime. Crucially, presented sensing technique avoids use additional, capacitively device such as point or single electron transistor, making particularly interesting for graphene dots.