THz photon-assisted tunneling in hBN encapsulated graphene quantum dot

Photon-assisted tunneling (PAT) is an attractive process for the study of light-matter interaction phenomena. In PAT, the electron tunneling through a quantum dot is enabled via the quantum absorption of an electromagnetic wave. The observation of PAT under THz illumination have been limited to semiconductor superlattices [1] , resonant tunneling diodes [2] and more recently carbon nanotube quantum dots [3] . Graphene quantum dots (GQD) of typical size 100 nm size have great potential for PAT under THz illumination as their energy level splitting to quantum electron confinement falls in the THz range [4] , and room temperature bolometric detection of THz radiation have been demonstrated in GQD-based devices [5] .