Quantum theory of time-dependent transport in graphene
Doktorsavhandling, 2017

High-quality ballistic electronic devices made from graphene are becoming an experimental reality. Carbon-based electronics is heralded if not to succeed or surpass then to complement the existing semiconducting technology. This thesis investigates graphene-based devices from a theoretical point of view with the focus on high-frequency applications, where the material is expected to have a large impact. We develop a quantum-mechanical description of time-dependent transport in mesoscopic graphene samples based on a scattering matrix approach similar to Landauer-Büttiker treatment of non-relativistic charge carriers. We investigate scattering processes involved in transport through a GFET and identify resonant mechanisms that lead to enhancement of the source-drain current under an oscillating gate signal. We propose a tunable selective frequency multiplication scheme and a radiation detector with operation relying on such mechanisms. The performance of the proposed devices is investigated in terms of their shot noise and Fano factor, which we show to be suppressed due to Klein tunnelling even for strong driving of the system. Finally, we apply the formalism to a quantum pump based on an asymmetric potential profile with respect to the gate electrode doping and compute the current through it, revealing that the temperature and the back gate bias can be used to switch the direction of the current.

graphene

ballistic quantum transport

Landauer-Büttiker theory

Fano resonance

Floquet scattering matrix

Kollektorn (A423), MC2, Chalmers
Opponent: Prof. Henning Schomerus, Lancaster University, UK

Författare

Yevgeniy Korniyenko

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

Resonant second-harmonic generation in a ballistic graphene transistor with an ac-driven gate

Physical Review B: covering condensed matter and materials physics,; Vol. 93(2016)

Artikel i vetenskaplig tidskrift

Shot noise in a harmonically driven ballistic graphene transistor

Physical Review B,; Vol. 95(2017)

Artikel i vetenskaplig tidskrift

Nonlinear response of a ballistic graphene transistor with an ac-driven gate: High harmonic generation and terahertz detection

Physical Review B: covering condensed matter and materials physics,; Vol. 94(2016)p. Art no 125445-

Artikel i vetenskaplig tidskrift

Resonant single-parameter pumping in graphene

Styrkeområden

Nanovetenskap och nanoteknik

Ämneskategorier

Den kondenserade materiens fysik

ISBN

978-91-7597-590-0

Technical report MC2 - Department of Microtechnology and Nanoscience, Chalmers University of Technology: 365

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 4271

Utgivare

Chalmers tekniska högskola

Kollektorn (A423), MC2, Chalmers

Opponent: Prof. Henning Schomerus, Lancaster University, UK