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This study introduces a new Lindblad state-to-state method to analyze transport in open quantum systems, accounting for pumping and draining processes. It reveals how these factors and thermal baths influence exciton transport pathways.

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Area of Science:

  • Quantum dynamics
  • Theoretical chemistry
  • Condensed matter physics

Background:

  • Analyzing transport in open quantum systems with nonequilibrium initial conditions is challenging.
  • The state-to-state approach is useful for quantum systems interacting with thermal baths.
  • Real systems often experience pumping or draining processes affecting transport routes.

Purpose of the Study:

  • To extend the state-to-state analysis to include dissipative, pumping, and decohering processes in open quantum systems.
  • To develop a framework that accounts for energy exchange with a thermal bath in a numerically exact manner.
  • To unravel internal transport pathways and the influence of external processes and thermal solvents on these routes.

Main Methods:

  • Developed a Lindblad state-to-state analysis framework.
  • Incorporated energy exchange with the environment numerically exactly.
  • Simulated dynamics using path integral Lindblad dynamics for systems with pumps and drains.

Main Results:

  • The Lindblad state-to-state framework can analyze internal transport pathways and the effects of external processes.
  • Demonstrated the establishment of steady-state excitonic currents in molecular aggregates under simultaneous pump and drain influence.
  • Showcased that the method reduces to the standard state-to-state approach in the absence of pumping/draining processes.

Conclusions:

  • The Lindblad state-to-state method is a powerful tool for understanding open quantum system dynamics.
  • This approach provides unprecedented granularity for analyzing complex systems with multiple processes.
  • Enables novel investigations into the transport mechanisms of intricate quantum systems.