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Anomalous Coulomb-Enhanced Charge Transport in Triangular Triple-Quantum-Dot Systems
Shuo Dong1, Junqing Li1, Jianhua Wei1
1School of Physics, The Renmin University of China, Beijing 100876, China.
Entropy (Basel, Switzerland)
|May 4, 2026
Summary
Electron correlation and quantum interference significantly impact mesoscopic transport. A triangular triple-quantum-dot molecule shows enhanced current with increased Coulomb interaction (U), unlike linear arrays.
Area of Science:
- Quantum physics
- Mesoscopic transport
- Condensed matter theory
Background:
- Electron correlation and quantum interference are crucial for electron transport in nanoscale systems.
- Understanding nonequilibrium transport in quantum dot arrays is essential for developing quantum devices.
Purpose of the Study:
- To theoretically investigate the nonequilibrium transport dynamics of a triangular triple-quantum-dot (TTQD) molecule.
- To explore the influence of electron correlation and quantum interference on transport properties.
Main Methods:
- Utilized the exact hierarchical equations of motion (HEOM) formalism.
- Analyzed spectral functions to understand transport mechanisms.
- Investigated the effects of inter-dot tunneling (t) and Coulomb interaction (U).
Main Results:
- Observed a counterintuitive enhancement of stationary current with increasing Coulomb interaction (U), contrasting with suppression in linear arrays.
- Attributed the current enhancement to the interplay of Coulomb-induced energy shifts and triangular topology-specific quantum interference.
- Demonstrated modulation of interaction effects by chiral currents and electrode coupling strength.
Conclusions:
- The TTQD molecule exhibits unique transport behavior driven by electron correlation and quantum interference.
- The findings highlight the importance of molecular geometry and interactions in controlling mesoscopic transport.
- The study provides insights into designing quantum transport devices with tailored electronic properties.
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