Physicists design material that conducts one way and insulates the other.
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References
Terraneo, M., Peyrard,, M. & Casati, G. Controlling the energy flow in nonlinear lattices: a model for a thermal rectifier. Physical Review Letters 88, 094302, (2002).
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Ball, P. One-way street planned for heat. Nature (2002). https://doi.org/10.1038/news020304-2
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DOI: https://doi.org/10.1038/news020304-2