Development of new nanocrystal materials

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The discussion centers on the potential of new nanocrystal materials that could manipulate heat similarly to how light is controlled. There is debate over whether this approach, possibly termed "thermoptics," can exceed the constraints of Carnot's Law, with some suggesting the technology may allow for such advancements. Concerns are raised about the terminology used, particularly the classification of phonons as heat, which may misrepresent the underlying physics. The feasibility of applying equilibrium thermodynamics to this technology is questioned, given the lack of detailed understanding. Overall, the implications of surpassing the Carnot limit are viewed as fundamentally challenging and potentially impossible.
sanman
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I was reading about the development of new nanocrystal materials which could allow heat to be manipulated in the same way we now do with light:

http://web.mit.edu/newsoffice/2013/how-to-treat-heat-like-light-0111.html

What shall we call this approach? Thermoptics?

I'm not sure from reading the article whether this will allow us to surpass the limits and constraints of Carnot's Law, or whether this stuff can only function within those limits. It seems to me the article implies that we can surpass the Carnot limits.

What could this be used to improve, and how?
 
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I don't think that heat is the right word, and it is a bit sensationalist. What they have are phonons that they prepared somehow. I would guess calling their phonons heat is akin to calling a Laser thermal radiation.

If you have proper statistical temperature, then equilibrium thermodynamics can be applied, but without knowing details I doubt that this is the case here. You don't realize what beating the actual Carnot limit would imply. This would be akin to puzzles self assembling and paintings painting themselves. It is truly impossible.
 
A relative asked me about the following article: Experimental observation of a time rondeau crystal https://www.nature.com/articles/s41567-025-03028-y I pointed my relative to following article: Scientists Discovered a Time Crystal That Reveals a New Way to Order Time https://www.yahoo.com/news/articles/scientists-discovered-time-crystal-reveals-180055389.html This area is outside of my regular experience. I'm interested in radiation effects in polycrystalline material, i.e., grain...

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