Pomeranchuk cooling

Pomeranchuk cooling (named after Isaak Pomeranchuk) is the phenomenon in which liquid helium-3 will cool if it is compressed isentropically when it is below 0.3 K. This occurs because helium-3 has the unique property that solidification below 0.3 K requires pressure. The effect was first observed by Yuri Anufriev in 1965.^[1] This can be used to construct a .^[2]

In 2021 an analog effect has been observed on twisted bilayer graphene^[3]^[4]^[5]

References[]

^ Lee, David M. (1 July 1997). "The extraordinary phases of liquid ${}^{3}$He". Reviews of Modern Physics. 69 (3): 645–666. doi:10.1103/RevModPhys.69.645.
^ Weisstein, Eric. "Pomeranchuk Cooling". Eric Weisstein's World of Science.
^ "Electrons in twisted graphene 'freeze' when heated". Physics World. 2021-04-21. Retrieved 2021-11-21.
^ Rozen, Asaf; Park, Jeong Min; Zondiner, Uri; Cao, Yuan; Rodan-Legrain, Daniel; Taniguchi, Takashi; Watanabe, Kenji; Oreg, Yuval; Stern, Ady; Berg, Erez; Jarillo-Herrero, Pablo (April 2021). "Entropic evidence for a Pomeranchuk effect in magic-angle graphene". Nature. 592 (7853): 214–219. arXiv:2009.01836. doi:10.1038/s41586-021-03319-3. ISSN 1476-4687.
^ Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Aliberti, R.; Amoroso, A.; An, Q.; Lavania, Anita; Bai, X. H.; Bai, Y. (November 2021). "Oscillating features in the electromagnetic structure of the neutron". Nature Physics. 17 (11): 1200–1204. doi:10.1038/s41567-021-01345-6. ISSN 1745-2481.

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[1] Lee, David M. (1 July 1997). "The extraordinary phases of liquid ${}^{3}$He". Reviews of Modern Physics. 69 (3): 645–666. doi:10.1103/RevModPhys.69.645.

[2] Weisstein, Eric. "Pomeranchuk Cooling". Eric Weisstein's World of Science.

[3] "Electrons in twisted graphene 'freeze' when heated". Physics World. 2021-04-21. Retrieved 2021-11-21.

[4] Rozen, Asaf; Park, Jeong Min; Zondiner, Uri; Cao, Yuan; Rodan-Legrain, Daniel; Taniguchi, Takashi; Watanabe, Kenji; Oreg, Yuval; Stern, Ady; Berg, Erez; Jarillo-Herrero, Pablo (April 2021). "Entropic evidence for a Pomeranchuk effect in magic-angle graphene". Nature. 592 (7853): 214–219. arXiv:2009.01836. doi:10.1038/s41586-021-03319-3. ISSN 1476-4687.

[5] Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Aliberti, R.; Amoroso, A.; An, Q.; Lavania, Anita; Bai, X. H.; Bai, Y. (November 2021). "Oscillating features in the electromagnetic structure of the neutron". Nature Physics. 17 (11): 1200–1204. doi:10.1038/s41567-021-01345-6. ISSN 1745-2481.

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