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This study explores quantum spin Hall (QSH) samples, revealing their efficiency in generating charge power and functioning as spin heat engines. Unlike quantum Hall systems, QSH devices preserve time reversal symmetry, enabling versatile charge and spin refrigeration applications.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Phenomena
  • Materials Science

Background:

  • Quantum spin Hall (QSH) effect describes a state of matter with conducting edges and an insulating bulk.
  • Thermoelectric devices convert heat energy into electrical energy and vice versa.
  • Time reversal (TR) symmetry is a fundamental property in physics, crucial for understanding quantum phenomena.

Purpose of the Study:

  • To investigate the thermoelectric properties of a three-terminal quantum spin Hall (QSH) sample.
  • To explore the potential of QSH systems as efficient charge and spin heat engines.
  • To compare the functionality of helical QSH systems with chiral quantum Hall systems.

Main Methods:

  • Theoretical examination of a three-terminal QSH sample.
  • Analysis of charge and spin transport properties.
  • Comparison of QSH systems with preserved TR symmetry against quantum Hall systems with broken TR symmetry.

Main Results:

  • The inherent helicity of QSH samples enables efficient generation of charge power.
  • QSH systems can function as highly efficient spin heat engines.
  • Preserved TR symmetry in multiterminal QSH systems allows for operation as both heat engines and refrigerators for charge and spin.

Conclusions:

  • Multiterminal QSH systems offer superior versatility compared to quantum Hall systems due to preserved time reversal symmetry.
  • QSH-based devices hold promise for advanced thermoelectric applications, including efficient energy conversion and refrigeration.
  • The study highlights the potential of exploiting spin properties in thermoelectric devices.