Veranstaltungsdetails

23.3.2015, 15:00
Jungiusstr. 11, Hörsaal AP

SFB 668 - Sonder-Kolloquium

Prof. Dr. A. Balatsky (Nordic Institute for Theoretical Physics Nordita, Stockholm, Sweden):

Impurity Band Engineering in Superconductors and Majoronics

Impurities in semiconductors can be used to engineer bands and control electronic properties with high precision. Similar approach to engineered impurity bands in superconductors has only now began to be explored. Promising approach in this direction is the use of magnetic impurities and control of Yu Shiba Rusinov intragap states [1]. Detailed look reveals new aspects of single impurity states and impurity bands that local probes now can measure. Zero energy YSR states are often invoked as a path to Majorana states in superconductors[2,3]. To frame this approach I call it majoronics. I will discuss impurity bands, interplay of magnetic and potential scattering and role these impurity states can play in enabling the technology to create and manipulate majorana bouns states. [1] A. V. Balatsky, I. Vekhter, and J.-X. Zhu, Rev. Mod. Phys. 78, 373 (2006). [2] S. Nadj-Perge, I. K. Drozdov, J. Li, H. Chen, S. Jeon, J. Seo, A. H. MacDonald, B. A. Bernevig, and A. Yazdani, Science 346, 602 (2014). [3]Y. Kim, J. Zhang, E. Rossi, and R. M. Lutchyn, (2014), 1410.4558.