Enhancing single-parameter quantum charge pumping in carbon-based devices

Abstract

We present a theoretical study of quantum charge pumping with a single ac gate applied to graphene nanoribbons and carbon nanotubes operating with low resistance contacts. By combining Floquet theory with Green's function formalism, we show that the pumped current can be tuned and enhanced by up to two orders of magnitude by an appropriate choice of device length, gate voltage intensity and driving frequency and amplitude. These results offer a promising alternative for enhancing the pumped currents in these carbon-based devices.

3.5 pages, 2 figures

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• Quantum charge pumping in graphene-based devices: When lattice defects do help
• Time-dependent Landauer-Büttiker approach to charge pumping in AC-driven graphene nanoribbons
• Single-parameter adiabatic charge pumping in carbon nanotube resonators
• Spin Transport and Spin Pump in Graphene-like Materials: Effect of tilt in Dirac cones
• Resonant high harmonic generation in a ballistic graphene transistor with an AC driven gate
• Time-resolved impurity-invisibility in graphene nanoribbons
• Charge pumping in strongly-coupled molecular quantum dots
• Nonlinear response of a ballistic graphene transistor with an ac-driven gate: high harmonic generation and THz detection
• Nonadiabatic pure spin pumping in zigzag graphene nanoribbons with proximity induced ferromagnetism
• Shot noise in a harmonically driven ballistic graphene transistor
• Charge and heat transport of soft nanosystems in the presence of time-dependent perturbations
• Fluctuation-induced currents in suspended graphene nanoribbons: Adiabatic quantum pumping approach
• Single-parameter spin-pumping in driven metallic rings with spin-orbit coupling
• Charge waves and dynamical signatures of topological phases in Su-Schrieffer-Heeger chains