A67.00004. Thermal Hall effect in quantum paramagnets and cuprates
Presented by: Jung Hoon Han
Several theoretical aspects of thermal Hall transport in magnetic insulators are discussed in light of recent experimental progress in frustrated magnets and in undoped cuprates. A general formalism for calculating thermal Hall conductivity in magnets is presented[1,2] and used to compute such quantity for kagome ferromagnets and antiferromagnets under the perpendicular magnetic field. Both calculations bear close resemblance to actual experimental data. Furthermore I discuss our recent theoretical effort to understand the remarkable yet puzzling observation of large thermal Hall conductivity in undoped to lightly doped cuprates. A tentative scenario in terms of spinon Fermi surface is presented to work, to a certain extent, in matching the observation, albeit on weak experimental foundation. The talk covers materials learned from collaboration with Hyungyong Lee, Jin-Hong Park, Patrick Lee, and Yamashita group at ISSP.  Thermal Hall effect of spins in a paramagnet, Hyunyong Lee, Jung HoonHan, and Patrick A. Lee, Phys. Rev. B 91, 125413 (2015). Spin Chirality and Hall-Like Transport Phenomena of Spin Excitations,Jung Hoon Han, and Hyunyong Lee, J. Phys. Soc. Jpn. 86, 011007(2017). Spin Thermal Hall Conductivity of a Kagome Antiferromagnet, HayatoDoki et al., Phys. Rev. Lett. 121, 097203 (2018). Consideration of thermal Hall effect in undoped cuprates, Jung HoonHan, Jin-Hong Park, and Patrick A. Lee, Phys. Rev. B 99, 205157 (2019).
- Jung Hoon Han