3 papers
cond-mat.str-el2020
Scaling behavior in a multicritical one-dimensional topological insulator
M. Malard, H. Johannesson, W. Chen
A class of Aubry-André-Harper models of spin-orbit coupled electrons exhibits a topological phase diagram where two regions belonging to the same phase are split up by a multicriti…
cond-mat.stat-mech2020
Multicriticality in a one-dimensional topological band insulator
Mariana Malard, David Brandao, Paulo Eduardo de Brito +1
A central tenet in the theory of quantum phase transitions (QPTs) is that a nonanalyticity in the ground-state energy in the thermodynamic limit implies a QPT. Here we report on a…
cond-mat.str-el2018
Movable but not removable band degeneracies in a symmorphic crystal
Mariana Malard, Paulo Eduardo de Brito, Stellan Ostlund +1
Crossings of energy bands in solids that are not pinned at symmetry points in the Brillouin zone and yet cannot be removed by perturbations are thought to be conditioned on the pre…