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Suggested Citation:"1 Introduction." National Academies of Sciences, Engineering, and Medicine. 2019. Frontiers in Thermal Transport and Energy Conversion: Proceedings of a Workshop. Washington, DC: The National Academies Press. doi: 10.17226/25549.
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1 Introduction The workshop Frontiers in Thermal Transport and Energy Conversion was held April 11, 2019, in Washington, D.C. (see Appendix A, Workshop Agenda). Organized by the Condensed Matter and Materials Research Committee (CMMRC) of the National Academies of Sciences, Engineering, and Medicine, the event brought together speakers and attendees representing industry, academia, and government agencies (see Appendix B, Workshop Participants and Appendix D, Biographies). Aharon Kapitulnik, Stanford University, thanked CMMRC’s sponsors, the U.S. Department of Energy and the National Science Foundation, and offered welcoming remarks outlining the workshop’s context and purpose. Beginning with the study of heat conduction and heat diffusion, the field of thermal transport can trace its roots back at least 200 years, Kapitulnik noted. In the 1820s, before Ohm’s law of resistance was published, Thomas Johann Seebeck discovered a proportional relationship between temperature and voltage, now known as the Seebeck coefficient.1 Shortly after that, Joseph Fourier published his work on heat flow.2 Thermal transport and energy conversion remains an active field offering opportunities for new discoveries and applications. By providing a venue for in-depth talks and open discussion, the workshop was designed to surface key challenges, opportunities, and issues in the field. The hope, Kapitulnik said, is that these discussions will enable participants to gain an understanding of new concepts and also help guide where energy and investments should be directed in order to advance this exciting branch of science. The workshop was unclassified and open to the public. This report offers a condensed summary of the proceedings based on recordings, slides, and transcripts. 1 T.J. Seebeck, 1822, Über den Magnetismus der galvanischen Kette, Abhandlungen der physikalischen Klasse der Königlisch-Preußsischen. Akademie der Wissenschaften aus den Jahren 1820-1821: 289–346. 2 J. Fourier, 1822, Théorie analytique de la chaleur. Paris: Firmin Didot Père et Fils. PREPUBLICATION COPY—SUBJECT TO FURTHER EDITORIAL CORRECTION 1

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Thermal transport and energy conversion has remained an active field for at least 200 years, with numerous opportunities for discoveries and new applications. Recently, experiments have advanced researchers’ understanding of basic physics, and how new discoveries might translate into applications in energy, materials, quantum technologies, and other areas.

The National Academies convened a workshop on April 11, 2019 to identify and assess the frontier of current research in the field of thermal transport and energy conversion. Discussions involved topics related to thermal transport and quasi-particle hydrodynamics, thermal transport beyond the quasiparticle paradigm, the thermal hall effect from neutral spin excitations in frustrated quantum magnets, quantization of the thermal hall conductivity at small hall angles, and thermal spin transport, including spin-seebeck and magnon drag effects. These topics were strategically selected with the goal of uncovering key challenges, opportunities, and issues in order to guide future efforts and investments to advance the field. This publication offers a condensed summary of the discussions and presentations from the workshop, which was unclassified and open to the public.

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