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Adiabatic Preparation of a Correlated Symmetry‐Broken Initial State with the Generalized Kadanoff–Baym Ansatz
- Source :
- physica status solidi (b), Physica Status Solidi B
- Publication Year :
- 2019
-
Abstract
- A fast time propagation method for nonequilibrium Green's functions based on the generalized Kadanoff--Baym Ansatz (GKBA) is applied to a lattice system with a symmetry-broken equilibrium phase, namely an excitonic insulator. The adiabatic preparation of a correlated symmetry-broken initial state from a Hartree--Fock wave function within GKBA is assessed by comparing with a solution of the imaginary-time Dyson equation. We find that it is possible to reach a symmetry-broken correlated initial state with nonzero excitonic order parameter by the adiabatic switching procedure. We discuss under which circumstances this is possible in practice within reasonably short switching times.<br />10 pages, 5 figures, Progress in Nonequilibrium Green's Functions VII proceedings
- Subjects :
- 010302 applied physics
Physics
Strongly Correlated Electrons (cond-mat.str-el)
Crystal system
FOS: Physical sciences
Non-equilibrium thermodynamics
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter Physics
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
01 natural sciences
Electronic, Optical and Magnetic Materials
Equilibrium phase
Condensed Matter - Strongly Correlated Electrons
Quantum mechanics
0103 physical sciences
0210 nano-technology
Adiabatic process
Wave function
Ansatz
Subjects
Details
- ISSN :
- 03701972
- Database :
- OpenAIRE
- Journal :
- physica status solidi (b)
- Accession number :
- edsair.doi.dedup.....65680c677ba1692e03ef901788da88a1
- Full Text :
- https://doi.org/10.1002/pssb.201800469