Caractérisation des paramagnétiques quantiques 3D à l’aide des contraintes de Lieb-Schultz-Mattis. – (Chunxiao Liu / LPT / Seminar). – 3/12/2024, 14H

Séminaire LPT

Chunxiao Liu (UC Berkeley)

Seminar LPT, 3/12/2024, 14H, 3R4, salle de conférence

Summary
Quantum paramagnets represent intriguing quantum phases that evade ordering even at absolute zero temperature. While detecting their presence is relatively straightforward, unraveling their fundamental nature can be a challenging task. In this talk, I will present our recent work [1] on Lieb-Schultz-Mattis (LSM) constraints which prohibit certain quantum paramagnets from being a « trivial » one. I will illustrate the use of these results through two examples : (1) the prediction of a Dirac spin liquid in the triangular lattice compound NaYbO2, and (2) the characterization of U(1) quantum spin liquids in a pyrochlore S=1/2 antiferromagnet. I will highlight the topological response theory underlying the LSM constraints that we developed, containing information about symmetry, excitations, and lattice defects, applicable to all 3D quantum paramagnets.

[1] Liu & Ye, arXiv:2410.03607