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Fermi Liquid Theory for Nonlinear Transport through a Multilevel Anderson Impurity
Yoshimichi Teratani1, Rui Sakano2, Akira Oguri3
1Department of Physics, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan.
Physical Review Letters
|December 4, 2020
Summary
We explored low-energy transport through Anderson impurities using a microscopic Fermi liquid theory. Three-body correlations significantly impact current noise and magnetic field effects, especially for strong interactions.
Area of Science:
- Condensed Matter Physics
- Quantum Transport Phenomena
Background:
- Understanding electron transport through magnetic impurities is crucial for quantum devices.
- The Anderson impurity model describes interacting electrons at a localized magnetic site.
Purpose of the Study:
- To investigate low-energy transport properties of the Anderson impurity model.
- To analyze nonequilibrium current fluctuations and the role of many-body correlations.
Main Methods:
- Microscopic Fermi liquid theory applied to quantum transport.
- Numerical Renormalization Group (NRG) calculations up to N=6.
- Analysis of two-quasiparticle collision integrals and three-body correlations.
Main Results:
- Three-body fluctuations are governed by a single parameter beyond the Kondo scale for 1≲N_{d}≲N-1.
- These fluctuations significantly influence current noise for N>2.
- The behavior of noise in magnetic fields is also notably affected.
Conclusions:
- The study provides a detailed microscopic understanding of transport in interacting Anderson impurities.
- Highlights the importance of three-body correlations in determining noise properties.
- Offers insights into quantum transport phenomena under non-equilibrium conditions and magnetic fields.
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