Speaker
Description
After a brief review of how to describe the π electrons of Dirac materials and topóligical defects, such as disclinations and dislocations, we propose a scenario where the effects of dislocations, in bidimensional Dirac materials, can be described, at low energies, by a vertex proportional to the totally antisymmetric component of the torsion generated by such dislocations. It is suggested that the two-dimensional geometric obstructions, already known in the literature, can be avoided by including time in the description of π electrons. In particular, the emphasis is placed on exotic time-loops, which could be obtained from the hole-particle pair excitations. If torsion/dislocation is present, a net flow of particles-antiparticles (holes) can be inferred and, possibly, be measured.
