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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.

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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.