Speaker
Description
Dissipation is usually associated with decoherence and loss of quantum properties. However, in interacting many-body systems it can also stabilize unconventional states, and profoundly modify electronic, optical and topological properties. Describing these phenomena requires a framework capable of treating interactions, external driving, and environmental effects on the same footing.
In this talk, I will present the nonequilibrium Green’s-function theory of interacting systems governed by the dissipative (non-unitary) Lindbladian dynamics. By reformulating the Keldysh construction in second quantization, we extend diagrammatic perturbation theory to many-body dissipative processes, and present the corresponding Kadanoff–Baym equations.
The resulting framework preserves much of the structure and versatility of conventional nonequilibrium Green’s-function methods for isolated systems. It therefore provides a foundation for correlated simulations of transient and steady-state phenomena in dissipative materials.