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Non-Equilibrium Green's Function Method for Energy, Momentum, and Angular Momentum Transfer Mediated by Photons

Kavli Institute for Theoretical Physics via YouTube

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Explore a 41-minute conference talk on the non-equilibrium Green's function method for energy, momentum, and angular momentum transfer mediated by photons. Delve into topics such as the Coulomb problem, Meir-Wingreen formula, heat transfer between graphene sheets and nanotubes, and system setups. Examine NEGF preliminaries, fluctuation-dissipation theorem, Dyson equations, and Keldysh equation. Investigate the Poynting theorem, momentum and angular momentum conservation, and far-field approximations. Learn about torque and force on objects, resonance effects, and emission from graphene edges. Discover the advantages of NEGF and explore angular momentum emission from a benzene molecule. Presented by Jian Sheng Wang from the National University of Singapore at the Quantum and Thermal Electrodynamic Fluctuations in the Presence of Matter conference held at the Kavli Institute for Theoretical Physics.

Syllabus

Intro
Coulomb problem, Meir- Wingreen formula
Heat transfer between two graphene sheets
Geometry effects
Heat transfer between zigzag nanotubes or triangles
Heat transfer driven by current
System setup
NEGF preliminaries
Fluctuation-dissipation theorem in thermal equilibrium
Dyson equations
Keldysh equation
Q = 0 gauge, fundamental equation for vector potential A
Poynting theorem, steady state average
Momentum and angular momentum conservation
From surface integral to volume integral
Meir-Wingreen formula
Far field approximations
Torque and force on object
resonance effect
Force and torque from the nonequilibrium edge
Emission from graphene edge
NEGF advantage
Acknowledgements
Angular momentum emission
from a benzene molecule