Topological Insulators

  • Laura Ortiz MartínEmail author
Part of the Springer Theses book series (Springer Theses)


Topological insulators (TI) are just an example of a broader type of topological phase, called SPT phases, as mentioned in the general introduction. The hallmark of a two-dimensional (2D) TI is an insulating bulk energy gap along with gapless edge states [1, 2, 3, 4]. At each boundary, two counterpropagating edge states with opposite spin polarization and wave numbers form Kramers pairs, i.e. two distinct degenerate states connected by time-reversal symmetry. These states are denoted helical edge states due to the connection between spin and propagation direction.


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Racah Institute of PhysicsThe Hebrew University of JerusalemJerusalemIsrael

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