Graphene Quantum Capacitors for High Frequency Tunable Analog Applications.

Graphene quantum capacitors (GQC) are demonstrated to be enablers of radio-frequency (RF) functions through voltage-tuning of their capacitance. We show that GQC complements MEMS and MOSFETs in terms of performance for high frequency analog applications and tunability. We propose a CMOS compatible fabrication process and report the first experimental assessment of their performance at microwaves frequencies (up to 10 GHz), demonstrating experimental GQCs in the pF range with a tuning ratio of 1.

Near optimal graphene terahertz non-reciprocal isolator.

Isolators, or optical diodes, are devices enabling unidirectional light propagation by using non-reciprocal optical materials, namely materials able to break Lorentz reciprocity. The realization of isolators at terahertz frequencies is a very important open challenge made difficult by the intrinsically lossy propagation of terahertz radiation in current non-reciprocal materials. Here we report the design, fabrication and measurement of a terahertz non-reciprocal isolator for circularly polarized waves based on magnetostatically biased monolayer graphene, operating in reflection.

Molecular dynamics of the "hydrophobic patch" that immobilizes hydrophobin protein HFBII on silicon.

The experimentally-observed stable, electrically-conducting interface formed between hydrophobin protein HFBII and silicon provides a model system for the Bio/ICT interfaces required for bionanoelectronics. The present work used molecular dynamics (MD) computer simulations to investigate the atom-scale details of the assembly and structure of the HFBII/silicon interface, using models on the order of 40,000 atoms to compute energy profiles for the full protein interacting with a bare Si(111) substrate in aqueous solution. Five nanoseconds of free, equilibrated dynamics were performed for six models with initial protein:silicon separations ranging from 1.