Nonlinear Graphene Quantum Capacitors for Electrooptics
Abstract
Owing to its peculiar energy dispersion, the quantum capacitance property of graphene can be exploited in a twodimensional layered capacitor configuration. Using graphene and boron nitride respectively as the electrodes and the insulating dielectric, a strongly nonlinear behavior at zero bias and small voltages is obtained. When the temperature is sufficiently low, the strong nonlinear interaction emerging from the quantum capacitance exhibits a diverse range of phenomena. The proposed structure could take over the functionalities of nonlinear elements in many cryogenic quantum systems, and in particular, quantum electrooptics. It is shown that ultrastrong coupling is easily reached with small number of pump photons at temperatures around 1K and capacitor areas of the order of $1\mu{\textrm{m}}^2$. A measure of anharmonicity is defined and as potential applications, a qubit design as well as schemes for nonreciprocal devices such as an electromagnetic frequency circulator are discussed.
 Publication:

arXiv eprints
 Pub Date:
 November 2016
 DOI:
 10.48550/arXiv.1611.00227
 arXiv:
 arXiv:1611.00227
 Bibcode:
 2016arXiv161100227K
 Keywords:

 Quantum Physics;
 Condensed Matter  Mesoscale and Nanoscale Physics
 EPrint:
 Accepted to Nature 2D Materials &