Nonequilibrium Green's functions theory for the alpha factor of quantum cascade lasers (Conference Presentation)

2016 ◽  
Author(s):  
Mauro F. Pereira ◽  
David O. Winge ◽  
Andreas Wacker ◽  
Louise Jumpertz ◽  
Florian Michel ◽  
...  
Keyword(s):  
Green's Functions ◽  
Quantum Cascade Lasers ◽  
Green’S Functions ◽  
Quantum Cascade ◽  
Nonequilibrium Green’S Functions ◽  
Alpha Factor ◽  
Nonequilibrium Green's Functions ◽  
Cascade Lasers

scholarly journals Room temperature operation of n-type Ge/SiGe terahertz quantum cascade lasers predicted by non-equilibrium Green's functions

2019 ◽  
Vol 114 (11) ◽  
pp. 111102 ◽  
Author(s):  
Thomas Grange ◽  
David Stark ◽  
Giacomo Scalari ◽  
Jérôme Faist ◽  
Luca Persichetti ◽  
...  
Keyword(s):  
Green's Functions ◽  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Green’S Functions ◽  
Quantum Cascade ◽  
Cascade Lasers ◽  
Room Temperature Operation ◽  
Non Equilibrium

Nonequilibrium Green’s Functions

2018 ◽  
Author(s):  
Klaus Morawetz
Keyword(s):  
Green’S Function ◽  
Quantum Transport ◽  
Green's Function ◽  
Green's Functions ◽  
Green’S Functions ◽  
Equation Of Motion ◽  
Diagrammatic Technique ◽  
Initial Correlations ◽  
Nonequilibrium Green’S Functions ◽  
Nonequilibrium Green's Functions

The method of the equation of motion is used to derive the Martin–Schwinger hierarchy for the nonequilibrium Green’s functions. The formal closure of the hierarchy is reached by using the selfenergy which provides a recipe for how to construct selfenergies from approximations of the two-particle Green’s function. The Langreth–Wilkins rules for a diagrammatic technique are shown to be equivalent to the weakening of initial correlations. The quantum transport equations are derived in the general form of Kadanoff and Baym equations. The information contained in the Green’s function is discussed. In equilibrium this leads to the Matsubara diagrammatic technique.

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