+44-7360-538437Local broken symmetry and spin transport in the frustrated two-dimensional model
3rd International Conference on Applied Physics
August 23-24, 2018 | London, UK
Leonardo dos Santos Lima
Centro Federal de Educaçao Tecnologica de Minas Gerais, Brazil
Posters & Accepted Abstracts : J Appl Math Stat App
Abstract:
The local spontaneous symmetry breaking is a general phenomena in condensed matter physics. It is characterized by the fact that the action has a local symmetry but the quantum theory, instead of having a unique vacuum state which respects this symmetry, has a family of degenerate vacua that transform into each other under the action of the symmetry group. A simple example is given by a ferromagnetic model in which the action governing its microscopic dynamics is invariant under spatial rotations. A kind of local gauge invariance or spontaneous breaking of U(1) gauge symmetry is realized in nature in the phenomenon of superconductivity. We have proposed the Meissner mechanism for the spin supercurrent in quantum spin systems. Besides, we study the behavior of the AC spin conductivity in neighborhood of quantum phase transition in a frustrated spin model such as the antiferromagnet in the compass lattice with single ion anisotropy at T=0. Our results show the curve of conductivity varying strongly with the behavior of the critical anisotropy Dc and J.
Biography:
E-mail:
lslima7@yahoo.com.brPDF HTML