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Nonreciprocal thermal transport in a multiferroic helimagnet
Yuji Hirokane1, Yoichi Nii2,3, Hidetoshi Masuda2
1Department of Basic Science, University of Tokyo, Tokyo 153-8902, Japan.
Science Advances
|October 1, 2020
Summary
Spatial inversion symmetry breaking causes nonreciprocal thermal transport in multiferroic TbMnO3. This controllable thermal rectification in uniform crystals may lead to advanced thermal diodes.
Area of Science:
- Condensed matter physics
- Materials science
- Multiferroics
Background:
- Breaking spatial inversion symmetry is key to unique material phenomena.
- Noncentrosymmetric materials exhibit nonreciprocal responses when combined with magnetic or time-reversal symmetry breaking.
- The impact of spatial inversion symmetry breaking on thermal transport in uniform media is not well understood.
Purpose of the Study:
- To investigate nonreciprocal thermal transport in uniform media.
- To explore the effect of spatial inversion symmetry breaking on thermal conductivity.
- To demonstrate controllable thermal rectification in multiferroic helimagnets.
Main Methods:
- Experimental investigation of thermal transport properties.
- Utilizing the multiferroic helimagnet TbMnO3 as a model system.
- Measuring longitudinal thermal conductivity under varying conditions.
Main Results:
- Demonstrated nonreciprocal thermal transport in TbMnO3.
- Longitudinal thermal conductivity was found to depend on the direction of thermal current relative to the electric polarization and magnetization.
- Observed field-controllable thermal rectification in a uniform crystal.
Conclusions:
- Spatial inversion symmetry breaking can lead to nonreciprocal thermal transport in uniform multiferroic materials.
- TbMnO3 exhibits controllable thermal rectification, influenced by electric polarization and magnetization.
- This finding opens possibilities for developing scalable and controllable thermal diodes.
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