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Hong Sun1, Tingting Wang1, Zhuo Ju1

  • 1Ministry of Education Key Laboratory of NSLSCS, Phonon Engineering Research Center of Jiangsu Province, Center for Quantum Transport and Thermal Energy Science, Institute of Physics Frontiers and Interdisciplinary Sciences, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China.

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Finite line widths activate interband transport in phonon angular momentum generation. This discovery offers new pathways for optimizing the interband thermal Edelstein response in materials and nanostructures.

Keywords:
Green’s-function linear responseinterband responseline width broadeningspectral overlapthermally driven phonon angular momentum

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Phononics

Background:

  • Temperature gradients generate phonon angular momentum, primarily explained by intraband transport.
  • Existing models often overlook interband contributions due to phonon spectral overlap and line widths.

Purpose of the Study:

  • To investigate the role of finite phonon line widths in activating interband transport for phonon angular momentum generation.
  • To derive a criterion for interband channel activation and explore its material dependence.

Main Methods:

  • Utilized a self-energy-broadened Green's-function (bubble) framework to derive intraband/interband expressions.
  • Employed first-principles calculations for phonon dispersions, eigenvectors, and temperature-dependent line widths.
  • Analyzed materials with diverse phonon landscapes: Te, LiNbO3, and Rb2Se3, and a nanoribbon model.

Main Results:

  • Identified an activation criterion for the interband channel: (Γn + Γm)/2 ∼ |ωn - ωm|.
  • Demonstrated that interband contributions can dominate in anharmonic materials like Rb2Se3 at elevated temperatures.
  • Showed that line widths and subband crowding promote interband effects in nanostructures.

Conclusions:

  • Finite phonon line widths are crucial for activating interband transport, expanding beyond semiclassical intraband models.
  • Line width broadening serves as a tunable parameter for enhancing the interband thermal Edelstein response.
  • Provides guidelines for designing materials and nanostructures with significant interband contributions for advanced thermal transport applications.