O Instituto de Física de São Carlos (IFSC) da USP promoverá o colóquio Line-node chiral spin liquids na próxima quarta-feira, dia 8 de abril, às 16h30, na Sala Celeste.
O evento faz parte do Programa Café com Física, e será ministrado por Rodrigo Pereira (IFSC-USP).
Resumo:
Quantum spin liquids are interacting spin systems characterized by the absence of long-range magnetic order even at zero temperature. I will talk about an example of a spin liquid that is chiral (i.e. breaks parity and time reversal symmetry) and whose excitations are Majorana fermions coupled to a Z_2 gauge field. We show that the spectrum is gapless along lines in the three-dimensional Brillouin zone, and that these nodal lines are topological defects (vortices) of a non-Abelian Berry connection. This work is motivated by recent experiments in Mott-insulating double perovskites with strong spin-orbit coupling.
A sala Celeste fica no campus 1, Av. Trabalhador são-carlense, 400.
Mais informações:
Site: www.ifsc.usp.br/cafecomfisica