Научный семинар кафедры

12 октября в 12:30

Выпускник физического факультета МГУ, профессор Тран Минь Тьен (Институт физики Вьетнамской Академии Наук), выступит с докладом "Magnetic competition in flat-band systems" в ауд. 2-05 Криогенного корпуса

Аннтотация доклада:

A flat band exists in various two-dimensional lattices, such as the Kagome, Lieb lattices. In the presence of the band flatness, different magnetic phases compete and give rise to exotic properties. In topological kagome magnets a magnetic tunability from the out-of plane ferromagnetism to the in-plane antiferromagnetism is achieved through a universal property of the critical in-plane Hund coupling. At low temperature the out-of-plane ferromagnetism is stable until a finite crossing temperature. Above the crossing temperature the in-plane antiferromagnetism is stable, but the magnetization of the out-of plane ferromagnetism still survives. This suggests a metastable coexistence of these magnetic phases in a finite temperature range. A large anomalous Hall conductance is observed in the Ising-Hund coupling limit.