Zhiyu Dong

Sep 13, 2024 | link.aps.org | Zhiyu Dong |Leonid S. Levitov

Stoner magnetism in bands endowed with Berry curvature is shown to be influenced by the coupling between spin-chirality density s·(∂xs×∂ys) and Berry's orbital magnetization. The key effect is that carriers moving in the presence of a spin texture see it as a source of a geometric magnetic field coupled to the carrier's orbital motion through a spin-dependent Aharonov-Bohm effect. This interaction was recently predicted to enable chiral magnons propagating along system boundaries.

Oct 13, 2023 | link.aps.org | Zhiyu Dong |Leonid S. Levitov |Andrey Chubukov

Spin excitations that soften near the onset of magnetic order have long been known to act as “paramagnon” pairing glue that can drive superconductivity. Recent findings of superconductivity in graphene bilayers and trilayers, occurring in the proximity of different itinerant ordered phases polarized in isospin (spin and valley), have motivated us to conduct a comprehensive study of an isospin extension of the paramagnon pairing mechanism in the vicinity of different isospin orders.