Phonons become chiral in the pseudogap phase of cuprates

@article{Grissonnanche2020PhononsBC,
  title={Phonons become chiral in the pseudogap phase of cuprates},
  author={Ga{\"e}l Grissonnanche and S. Th'eriault and Adrien Gourgout and Marie-Eve Boulanger and E. Lefranccois and Amirreza Ataei and Francis Lalibert'e and Maxime Dion and J.-S. Zhou and Sunseng Pyon and Tomohiro Takayama and Hidenori Takagi and Nicolas Doiron-Leyraud and Louis Taillefer},
  journal={arXiv: Superconductivity},
  year={2020}
}
The nature of the pseudogap phase of cuprates remains a major puzzle. One of its new signatures is a large negative thermal Hall conductivity $\kappa_{\rm xy}$, which appears for dopings $p$ below the pseudogap critical doping $p^*$, but whose origin is as yet unknown. Because this large $\kappa_{\rm xy}$ is observed even in the undoped Mott insulator La$_2$CuO$_4$, it cannot come from charge carriers, these being localized at $p = 0$. Here we show that the thermal Hall conductivity of La$_2… 

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