Notificacion importante !

Debido al COVID-19 las instalaciones permaneceran cerradas

The so-called topological insulator materials have recently generated a lot of interest in Condensed Matter Physics. Despite being insulators (i.e., they don’t allow electrical currents to flow) in the bulk, these materials present robust conducting states at the surface. The origin of this robust behavior is rooted in their particular electronic structure, which endows them with immunity to disorder and other imperfections. They ideal conductors.

The so-called topological insulator materials have recently generated a lot of interest in Condensed Matter Physics. Despite being insulators (i.e., they don’t allow electrical currents to flow) in the bulk, these materials present robust conducting states at the surface. The origin of this robust behavior is rooted in their particular electronic structure, which endows them with immunity to disorder and other imperfections. They ideal conductors.
 This feature makes them useful in electronics, spintronics and quantum computation. However, the theory that describes topological insulating materials is not complete, i.e., it is limited to systems of non-interacting electrons.
In this work, we have extended the theoretical ideas to describe more realistic topological insulators, allowing for repulsive interactions among the constituent electrons. This results in unexpected and qualitatively different behavior. We have found that a strongly interacting topologically insulating wire would support robust magnetic states at its ends (see picture). Our results will allow to build a better understanding and better descriptions of recently fabricated topological insulators.

“Magnetic End States in a Strongly Interacting One-Dimensional Topological Kondo Insulator”
Alejandro M. Lobos, Ariel O. Dobry, and Victor Galitski
Phys. Rev. X 5, 021017 (2015)