High-frequency gate manipulation of a bilayer graphene quantum dot

TL;DR

This paper demonstrates high-frequency gate control of a bilayer graphene quantum dot with exceptional stability and minimal interference from the back gate, advancing quantum dot manipulation techniques.

Contribution

It introduces a double-gated bilayer graphene quantum dot with stable Coulomb blockade and high-frequency gate manipulation up to 100 MHz.

Findings

Cytop(TM) dielectric provides remarkable electronic stability at cryogenic temperatures.

Gate manipulation with 100 MHz square pulses is successfully demonstrated.

Signal amplitude remains unaffected by the back gate presence.

Abstract

We report transport data obtained for a double-gated bilayer graphene quantum dot. In Coulomb blockade measurements, the gate dielectric Cytop(TM) is found to provide remarkable electronic stability even at cryogenic temperatures. Moreover, we demonstrate gate manipulation with square shaped voltage pulses at frequencies up to 100 MHz and show that the signal amplitude is not affected by the presence of the capacitively coupled back gate.