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Updated: May 14, 2026
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Published on: January 19, 2018
Time-dependent electron transport through a strongly correlated quantum dot: multiple-probe open-boundary conditions
A Pertsova1, M Stamenova, S Sanvito
1School of Physics and CRANN, Trinity College Dublin, Dublin 2, Ireland. pertsova@tcd.ie
Summary
We studied electron transport in quantum dots using advanced computational methods. Our findings reveal current oscillations and negative differential conductance due to electron interactions.
Area of Science:
- Condensed Matter Physics
- Quantum Computing
- Materials Science
Background:
- Understanding electron transport in quantum dots is crucial for developing advanced electronic devices.
- Strongly correlated systems present unique challenges for theoretical modeling.
- The Coulomb blockade effect significantly influences charge transport dynamics.
Purpose of the Study:
- To investigate time-dependent electron transport through a strongly correlated quantum dot.
- To explore the impact of electron-electron interactions on transport properties.
- To analyze the emergence of current oscillations and negative differential conductance.
Main Methods:
- Utilizing adiabatic lattice density functional theory in the Bethe ansatz local-density approximation (BALDA) coupled with the Hubbard model.
- Employing the multiple-probe battery method for open-boundary time-domain simulations.
- Systematically varying approximations for electron-electron interactions (non-interacting, Hartree-only, adiabatic BALDA).
Main Results:
- Demonstrated a driven regime with regular current oscillations, consistent with the dynamical picture of Coulomb blockade.
- Observed negative differential conductance at high bias voltages and strong Coulomb interactions.
- Analyzed the influence of improved electron-electron interaction approximations on transmission spectra and I-V characteristics.
Conclusions:
- The study confirms the dynamical nature of Coulomb blockade in strongly correlated quantum dots.
- Electron-electron interactions and electrode bandwidth are key factors in achieving negative differential conductance.
- The employed computational framework provides a robust approach for simulating complex quantum transport phenomena.
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