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Efficient quantum transport in disordered interacting many-body networks
Adrian Ortega1, Thomas Stegmann1, Luis Benet1,2
1Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Cuernavaca, Mexico.
This study reveals that fermion transport in disordered networks is maximized with high system filling and specific interaction strengths. Centrosymmetric networks significantly enhance transport, leading to perfect transmission resonances.
Area of Science:
- Quantum physics
- Condensed matter physics
- Many-body systems
Background:
- Understanding coherent transport in disordered quantum systems is crucial for quantum technologies.
- Random matrix theory provides a framework for studying complex quantum dynamics.
- Fermionic systems with interactions present unique transport phenomena.
Purpose of the Study:
- To investigate the coherent transport of fermions in disordered networks.
- To determine the optimal conditions for maximal conductance bandwidth and total current.
- To explore the impact of centrosymmetry on transport properties.
Main Methods:
- Modeling disordered networks using embedded Gaussian random matrix ensembles (EGE).
- Analyzing transport properties, including conductance bandwidth and total current.
- Utilizing spectral decomposition to understand transmission characteristics.
- Comparing standard EGE with centrosymmetric EGE (csEGE).
Main Results:
- Maximal conductance bandwidth and current achieved at high system filling (n∼l-1) and intermediate interaction (k∼n/2).
- Minimal bandwidth observed for k=1 and k=n interactions.
- Centrosymmetric EGE (csEGE) significantly enhances transport across all parameters.
- csEGE exhibits numerous perfect transport resonances due to suppressed destructive interference.
Conclusions:
- System filling and interaction type critically influence fermion transport in disordered networks.
- Centrosymmetry is a key factor in achieving enhanced, backscattering-free transport.
- csEGE demonstrates robust perfect transmission, with a dominant current peak under specific conditions.
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