Origin of the large phonon thermal Hall effect in cuprates · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title
Origin of the large phonon thermal Hall effect in cuprates
Plain
In copper-oxide superconductors, phonons gain a large sideways heat flow below the doping where the pseudogap state appears and also in the undoped insulating parents. What gives phonons this handedness is unknown.
Precise · changed · core
Revision 1: In hole-doped cuprates inside the pseudogap phase and in the Mott insulators La2CuO4 and Sr2CuO2Cl2, a large negative $\kappa_{xy}$, present for heat flow both in the CuO2 planes and along $c$, is attributed to phonons (Grissonnanche et al. 2019, 2020); a planar thermal Hall response with $B$ in the plane was reported in 2024 (Chen et al., Physical Review X 14, 041011). Identify what couples phonons to $B$ (spin fluctuations of the antiferromagnetic background, defects, or charge-order domains) and predict the doping, field-direction and temperature dependence.
Revision 2: In hole-doped cuprates inside the pseudogap phase and in the Mott insulators $\mathrm{La_2CuO_4}$ and $\mathrm{Sr_2CuO_2Cl_2}$, a large negative $\kappa_{xy}$, present for heat flow both in the $\mathrm{CuO_2}$ planes and along $c$, is attributed to phonons (Grissonnanche et al. 2019, 2020); a planar thermal Hall response with $B$ in the plane was reported in 2024 (Chen et al., Physical Review X 14, 041011). Identify what couples phonons to $B$ (spin fluctuations of the antiferromagnetic background, defects, or charge-order domains) and predict the doping, field-direction and temperature dependence.
Settled by
A microscopic coupling that predicts doping, field-direction and temperature dependence, checked across hole- and electron-doped cuprates and across defect densities.
Kind
phenomenon
Answer type
mechanism
References
(empty)
Literature status
open
Status note
(empty)
Posed since
2019

Decisions