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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Localized dissipation in linear moiré heat transport.

Guoqiang Xu1, Shuihua Yang2, Xue Zhou3

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Researchers demonstrate moiré-induced thermal localization in a linear system by engineering diffusivity. This breakthrough enables moiré physics in static, momentum-free heat transport, paving the way for programmable control.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Thermal Transport

Background:

  • Moiré superlattices are crucial for flat bands, enabling localization in quantum and topological systems.
  • Previous methods relied on nonlinear interactions, posing challenges for diffusive systems like thermal conduction.
  • Implementing moiré physics in a linear, momentum-free regime for thermal transport remained a significant hurdle.

Purpose of the Study:

  • To demonstrate moiré-induced thermal localization in a linear system.
  • To overcome the limitations of nonlinear interactions in diffusive transport phenomena.
  • To establish a new paradigm for moiré physics in static, linear systems.

Main Methods:

  • Engineered spatially varying diffusivity in a linearly coupled bilayer conductive system.
  • Tuned twist angles to create commensurate and incommensurate moiré patterns.
  • Analyzed the role of modulated wavevectors in controlling periodicity and local structure.

Main Results:

  • Achieved moiré-induced thermal localization without relying on nonlinear interactions.
  • Observed aperiodic thermal localization in incommensurate quasicrystals.
  • Linked the transition threshold for localization to the emergent lattice constant.

Conclusions:

  • Established a paradigm for implementing moiré physics in static, linear, and momentum-free diffusive systems.
  • Showcased geometrically programmable non-equilibrium control in heat and mass transport.
  • Opened new avenues for designing materials with tailored thermal properties using moiré patterns.