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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Mesoscopic systems

Background:

  • Understanding particle transport in quantum systems is crucial for developing novel electronic devices.
  • Local particle loss introduces dissipation, typically hindering transport.

Purpose of the Study:

  • To investigate particle transport through a coupled site chain with local loss.
  • To analyze the impact of particle loss on conductance and particle density.
  • To identify conditions for "protected" transport despite dissipation.

Main Methods:

  • Utilized the Keldysh formalism for open quantum systems.
  • Calculated steady-state conductance and particle density.
  • Analyzed single-particle eigenstates and their spatial symmetry.

Main Results:

  • Local particle loss reduces overall conductance.
  • Transport remains largely unaffected at specific chemical potentials due to symmetric eigenstates.
  • A density drop occurs at the lossy site under finite voltage, indicating nonballistic transport.

Conclusions:

  • Spatial symmetry of eigenstates can lead to dissipation-protected transport.
  • The findings offer a mechanism to maintain particle flow in the presence of loss.
  • Density profiles reveal transitions to nonballistic transport regimes.