Electronic double-excitations in quantum wells: solving the two-time Kadanoff-Baym equations

Abstract

For a quantum many-body system, the direct population of states of double-excitation character is a clear indication that correlations importantly contribute to its nonequilibrium properties. We analyze such correlation-induced transitions by propagating the nonequilibrium Green's functions in real-time within the second Born approximation. As crucial benchmarks, we compute the absorption spectrum of few electrons confined in quantum wells of different width. Our results include the full two-time solution of the Kadanoff-Baym equations as well as of their time-diagonal limit and are compared to Hartree-Fock and exact diagonalization data.

References in corpus (13)

• High Efficiency Carrier Multiplication in PbSe Nanocrystals: Implications for Solar Energy
• Perspectives on double-excitations in TDDFT
• Real-time Kadanoff-Baym approach to plasma oscillations in a correlated electron gas
• Many-body two-quantum coherences in semiconductor nanostructures
• Successes and Failures of Kadanoff-Baym Dynamics in Hubbard Nanoclusters
• Time-propagation of the Kadanoff-Baym equations for inhomogeneous systems
• Efficient grid-based method in nonequilibrium Green's function calculations. Application to model atoms and molecules
• Time-dependent second Born calculations for model atoms and molecules in strong laser fields
• Relaxation properties of the quantum kinetics of carrier-LO-phonon interaction in quantum wells and quantum dots
• Image charge dynamics in time-dependent quantum transport
• Kadanoff-Baym approach to double-excitations in finite systems
• Towards a nonequilibrium Green's function description of nuclear reactions: one-dimensional mean-field dynamics
• Electronic correlations in double ionization of atoms in pump-probe experiments

Cited by in corpus (20)

• The Uniform Electron Gas at Warm Dense Matter Conditions
• Hubbard nanoclusters far from equilibrium
• Ultrafast Dynamics of Strongly Correlated Fermions -- Nonequilibrium Green Functions and Selfenergy Approximations
• Comparing the generalized Kadanoff-Baym ansatz with the full Kadanoff-Baym equations for an excitonic insulator out of equilibrium
• Non-equilibrium Green's function approach to inhomogeneous quantum many-body systems using the Generalized Kadanoff Baym Ansatz
• Many-body Green's function theory for electron-phonon interactions: the Kadanoff-Baym approach to spectral properties of the Holstein dimer
• CHEERS: A tool for Correlated Hole-Electron Evolution from Real-time Simulations
• Quantum Breathing Mode of Interacting Particles in a One-dimensional Harmonic Trap
• Time-linear quantum transport simulations with correlated nonequilibrium Green's functions
• The generalized Kadanoff-Baym ansatz. Computing nonlinear response properties of finite systems
• Spectral properties from Matsubara Green's function approach - application to molecules
• Electronic transport in molecular junctions: The generalized Kadanoff-Baym ansatz with initial contact and correlations
• Few-particle quantum dynamics---comparing Nonequilibrium Green's functions with the generalized Kadanoff-Baym ansatz to density operator theory
• Dynamics of Hubbard nano-clusters following strong excitation
• Adiabatic Preparation of a Correlated Symmetry-Broken Initial State with the Generalized Kadanoff--Baym Ansatz
• Accelerating Nonequilibrium Green functions simulations: the G1-G2 scheme and beyond
• Nonequilibrium Green's function approach to the pair distribution function of quantum many-body systems out of equilibrium
• Quantum Fluctuations Approach to the Nonequilibrium $GW$-Approximation II: Density Correlations and Dynamic Structure Factor
• The dissection algorithm for the second-Born self-energy
• Thermoelectric energy conversion in molecular junctions out of equilibrium