Controlling Topological Nanomaterials

Datum

13.12.2017

Zeit

15:00 - 17:00

Sprecher

Prof. Judy J. Cha

Zugehörigkeit

Yale University, New Haven, CT, USA

Sprache

en

Hauptthema

Chemie

Andere Themen

Physik, Chemie

Host

Prof. C. Felser, Prof. J. Grin, Prof. A. Mackenzie, Prof. L.H. Tjeng

Beschreibung

Despite the remarkable progress in our understanding of topological materials and experimental verifications of the topological surface states, making nanoscale topological materials with easily accessible surface states via transport measurements remains a challenge. For successful device applications however, it is critical to control the electrical properties of topological materials at the nanoscale in reduced dimensions. I will present our efforts in controlling the electronic properties of SnTe topological crystalline insulator nanostructures via doping and controlling growth conditions during chemical vapour deposition. Alloying with Se anions, indium doping, and surface defects are investigated to show how the transport properties of SnTe can be modulated. In particular, morphology-dependent superconductivity is observed in In-doped SnTe nanostructures, which are a candidate topological superconductor. We explore material issues that dictate the observed superconducting behaviors. If time allows, I will discuss unexpected crystallization phenomena that emerge in metallic glasses confined in nanoscale via in situ transmission electron microscopy heating experiments, testing the limits of the classical nucleation theories.

Links

• MPI CPfS

Letztmalig verändert: 13.12.2017, 09:02:55