Homepage of the 2nd Institute of Physics, RWTH Aachen - News

Current events

Next talk tomorrow at 11:00 by Yeganeh Mirzanejad!

News 05.07.2025
New publication: Electric-Field-Tunable Spināˆ’Orbit Gap in a Bilayer Graphene/WSe2 Quantum Dot

Site Content:

← Back to the full news list.

News 12.03.2014

New publication: Negative quantum capacitance in graphene nanoribbons with lateral gates

../../images/news/Sim_ribbon.png

Phys. Rev. B 89, 115406 (2014)
We present numerical simulations of the capacitive coupling between graphene nanoribbons of various widths and gate electrodes in different configurations. We compare the influence of lateral metallic or graphene side gate structures on the overall back gate capacitive coupling. Most interestingly, we find a complex interplay between quantum capacitance effects in the graphene nanoribbon and the lateral graphene side gates, giving rise to an unconventional negative quantum capacitance. The emerging nonlinear capacitive couplings are investigated in detail. The experimentally relevant relative lever arm, the ratio between the coupling of the different gate structures, is discussed.

read more