Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 87: Poster: Topological Insulators (HL jointly with MA, O)

O 87.8: Poster

Donnerstag, 3. April 2014, 17:00–20:00, P1

Ferromagnetic contacts on topological insulators: Lithographic realization on strained 3-dimensional HgTe — •Kalle Bendias, Erwann Bocquillon, Simon Hartinger, Christoph Brüne, Hartmut Buhmann, and Laurens Molenkamp — EP3, Physikalisches Institut, Universität Würzburg, Am Hubland, D-97074 Würzburg

Topological insulators are a new class of material with insulating bulk and conducting Dirac-like surface states. These states are associated with spin-momentum locking, which is supposed to lead to numerous applications in spintronics [1].

Here we report on lithographic ways to realize the concept of spin injection and detection into the Dirac-like surface states of the 3-dimensional topological insulator HgTe. We discuss fabrication challenges such as unstrained deposition of ferromagnetic material and the realization of a diffusion barrier on the high temperature-sensitive HgTe material system.

[1]C. Brüne, et. al, Phys. Rev. Lett. 106, 126803 (2011)