Second-order bosonic Kadanoff-Baym equations for plasmon-accompanied optical absorption

Progress in Non-equilibrium Green's Functions

Schüler, Michael^1 ; Pavlyukh, Yaroslav^1

Martin Luther University Halle-Wittenberg, Halle (Saale)

06099, Germany^1

关键词: Collective excitations;    Light-matter interactions;    New approaches;    Non equilibrium;    Non-equilibrium Green's function formalism;    Quasi particles;    Second-order equation;    Transient absorption;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/696/1/012006/pdf
DOI  :  10.1088/1742-6596/696/1/012006

来源: IOP

【 摘 要 】

The availability of ultra-short and strong light sources opens the door for a variety of new experiments such as transient absorption, where optical properties of systems can be studied in extreme nonequilibrium situations. The nonequilibrium Green's function formalism is an efficient approach to investigate these processes theoretically. Here we apply the method to the light-matter interaction of the magnesium 2p core level accompanied by electron-plasmon interaction due to collective excitations in the conduction band. The plasmons are described as massive bosonic quasi-particle excitations, leading to a second-order equations of motion, requiring a new approach for their propagation.