HomeSciencePhysicsSpinning Heat in Reverse

Spinning Heat in Reverse

• Physics 16, s43

When spun quick sufficient, a chilly object can switch warmth to a close-by sizzling object.

J. R. Deop-Ruano and A. Manjavacas [1]

Heat flows from sizzling to chilly, however a quick spin might break that rule. Juan Deop-Ruano and Alejandro Manjavacas from the Institute of Optics (IO-CSIC) in Spain predict that if two nanoscale disks are positioned shut to one another and rotated at excessive frequencies, warmth might transfer from the chilly disk to the recent one [1]. The duo acknowledge that this conduct will probably be tough to breed within the lab—no less than within the close to future—however hope it would nonetheless encourage new concepts for controlling the temperature of nanoscale objects.

Many different teams have studied the radiative warmth switch between nanostructures. Likewise, many have probed the so-called Casimir torque performing on close by nanostructures that rotate with respect to one another. Deop-Ruano and Manjavacas are the primary to investigate these two results concurrently.

The duo thought-about two disks—one sizzling, one chilly—whose sizes and separation are a lot smaller than the dominant wavelength of their thermal radiation. In this example, the disks are approximated as easy electrical dipoles, and their interplay is a mixture of thermal radiation and Casimir torque results. The researchers calculated the vitality switch between the disks and located {that a} fast-spinning chilly disk can provide extra vitality to a sizzling disk than it receives. “The rotation modifies the energy distribution of the thermal radiation of the disks, making them effectively behave as if they have a different temperature,” Manjavacas says.

For this reversed warmth stream to be observable at temperatures round 1 Okay, the objects should be rotating at a price of 100 GHz. Recently, experimentalists have managed to spin nanostructures at a number of GHz, so Deop-Ruano and Manjavacas are hopeful that technical advances might enable a check of their predictions sooner or later.

–Michael Schirber

Michael Schirber is a Corresponding Editor for Physics Magazine based mostly in Lyon, France.


  1. J. R. Deop-Ruano and A. Manjavacas, “Control of the radiative heat transfer in a pair of rotating nanostructures,” Phys. Rev. Lett. 130, 133605 (2023).

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