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Localized states in bosonic chains with quasiperiodic potentials can create significant energy current rectification. This effect is tunable by adjusting the potential and bath coupling, allowing control over heat flow direction and magnitude.

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Area of Science:

  • Condensed matter physics
  • Quantum mechanics
  • Statistical mechanics

Background:

  • Energy current rectification is crucial for thermal management.
  • Quasiperiodic potentials create unique electronic and transport properties.
  • Mobility edges delineate localized and delocalized states in quantum systems.

Purpose of the Study:

  • Investigate energy current rectification in a quadratic bosonic chain.
  • Explore the role of single-particle mobility edges and localized eigenstates.
  • Analyze the impact of quasiperiodic potentials and boundary couplings.

Main Methods:

  • Studied a quadratic bosonic chain with a quasiperiodic potential.
  • Coupled the chain's boundaries to spin baths at different temperatures.
  • Analyzed the spatial position of localized eigenstates relative to the mobility edge.

Main Results:

  • Observed orders-of-magnitude increases in energy current rectification.
  • Found rectification depends strongly on the spatial position of localized eigenstates.
  • Identified maximum enhancement when one bath couples to localized states and the other to delocalized states.

Conclusions:

  • Single-particle mobility edges can induce strong energy current rectification.
  • Rectification is controllable by tuning the quasiperiodic potential and bath couplings.
  • The spatial distribution of localized and delocalized states dictates rectification efficiency and direction.