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Second-order post-Hartree-Fock perturbation theory for the electron current
1Department of Physics, Université Libre de Bruxelles, Brussels, Belgium.
The Journal of Chemical Physics
|April 26, 2011
Summary
We developed a new theory for electronic transport in interacting systems. This approach reveals how electron correlations significantly alter electrical properties beyond simple models.
Area of Science:
- Condensed matter physics
- Quantum many-body theory
Background:
- Understanding electronic transport in interacting systems is crucial for developing advanced electronic devices.
- Current theoretical models often rely on mean-field approximations, which may not capture complex correlation effects.
Purpose of the Study:
- To develop a novel nonequilibrium many-body perturbation theory for calculating electronic current.
- To investigate the impact of electronic correlations on transport properties in interacting systems.
- To apply the developed theory to the out-of-equilibrium Anderson model.
Main Methods:
- Utilizing the super-fermion representation of quantum kinetic equations.
- Implementing a post-Hartree-Fock many-body perturbation theory.
- Applying the theory to the Anderson model under nonequilibrium conditions.
Main Results:
- The developed theory successfully calculates electronic current in interacting systems.
- Nonequilibrium electronic correlations were found to introduce significant corrections to transport properties.
- The results demonstrate deviations from mean-field predictions.
Conclusions:
- The developed post-Hartree-Fock theory provides a more accurate description of electronic transport in correlated systems.
- Nonequilibrium correlations play a vital role in determining electronic transport properties.
- This work offers a practical approach for studying complex electronic phenomena.
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