PIRSA:21110022

Video URL

https://pirsa.org/21110022

Tuning multipolar orders and critical points in d-orbital Mott insulators

Paramekanti, A. (2021). Tuning multipolar orders and critical points in d-orbital Mott insulators. Perimeter Institute for Theoretical Physics. https://pirsa.org/21110022

Paramekanti, Arun. Tuning multipolar orders and critical points in d-orbital Mott insulators. Perimeter Institute for Theoretical Physics, Nov. 22, 2021, https://pirsa.org/21110022 

          @misc{ scivideos_PIRSA:21110022,
            doi = {10.48660/21110022},
            url = {https://pirsa.org/21110022},
            author = {Paramekanti, Arun},
            keywords = {Quantum Matter},
            language = {en},
            title = {Tuning multipolar orders and critical points in d-orbital Mott insulators},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2021},
            month = {nov},
            note = {PIRSA:21110022 see, \url{https://scivideos.org/pirsa/21110022}}
          }

Arun Paramekanti University of Toronto

Talk numberPIRSA:21110022
DOI10.48660/21110022
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

Traditionally, magnetism in solids deals with ordering patterns of the electron magnetic dipole moment, as probed, for instance, via neutron diffraction. However, f-electron heavy fermion systems are well-known candidates for more complex forms of symmetry breaking, involving higher-order magnetic or electric multipoles. In this talk, I will discuss our recent theoretical proposal for Ising octupolar order in d-orbital systems, which appears to explain a wide range of experiments in certain 5d transition metal oxides with spin-orbit coupling. The proposed Ising ferro-octupolar order is shown to be linked to a type of orbital loop-current order. Deviations from cubic symmetry, via strain or surfaces, induces a transverse field on the octupolar order which can lead to surface quantum phase transitions, or transitions in thin films or in strained 3D crystals. We propose further experimental tests of our proposal.