Navegando por Autor "Paredes, Alfredo Andres Vargas"
Agora exibindo 1 - 3 de 3
Resultados por página
Opções de Ordenação
Item Is the pseudogap a topological state?(2015) Paredes, Alfredo Andres Vargas; Cariglia, Marco; Doria, Mauro MelchiadesWe conjecture that the pseudogap is an inhomogeneous condensate above the homogeneous state whose existence is granted by topological stability. We consider the simplest possible order parameter theory that provides this interpretation of the pseudogap and study its angular momentum states. Also we obtain a solution of the Bogomol'nyi self-duality equations and find skyrmions. The normal state gap density, the breaking of the time reversal symmetry and the checker board pattern are naturally explained under this view. The pseudo gap is a lattice of skyrmions and the inner weak local magnetic field falls below the experimental threshold of observation given by NMR/NQR and μSR experiments.Item Topologically stable gapped state in a layered superconductor.(2014) Cariglia, Marco; Paredes, Alfredo Andres Vargas; Doria, Mauro MelchiadesWe show that a layered superconductor, described by a two-component order parameter, has a gapped state above the ground state, topologically protected from decay, containing flow and counterflow in the absence of an applied magnetic field. This state is made of skyrmions, breaks time reversal symmetry and produces a weak local magnetic field. We estimate the density of carriers that condense into the pseudogap of the cuprate superconductors based on the assumption that the pseudogap is a skyrmion state.Item Zero helicity states in the LaAlO3-SrTiO3 interface : the origin of the mass anisotropy.(2017) Rodrigues, Edinardo Ivison Batista; Doria, Mauro Melchiades; Paredes, Alfredo Andres Vargas; Cariglia, Marco; Perali, AndreaWe consider the transverse magnetic moment and torque observed by Li et al. (Nat. Phys. 7, 762 (2011)) in the LaAlO3/SrTiO3 interface and the theoretical model for it based on the zero helicity states. The transverse magnetic moment is explained in terms of an asymmetry between the two sides of the interface. We show here that there is an intrinsic magnetization which gives rise to a mass anisotropy in each side of the interface.