Ph

Crystalline topological materials

date
19.06.2018 
time
02:00 PM - 03:30 PM 
speaker
Prof. Dr. Titus Neupert 
affiliation
Universität Zürich, Schweiz 
language
en 
main topic
Physics: general
host
Prof. Dr. C. Felser, Prof. J. Grin, Prof. Dr. A. Mackenzie, Prof. Dr. L.H. Tjeng 
abstract

Topological properties of materials relate to universal phenomena that are particularly robust against perturbations, such as the conducting Dirac surface states of a three-dimensional topological insulator or topological semimetals with protected degeneracies between bulk electronic bands. I my talk, I will discuss how crystalline symmetries, such as rotation, mirror and inversion, enrich or constrain topological material properties. First, I will focus on topological semimetals. There, crystal symmetries may protect a whole zoo of band degeneracies. The absence of certain crystal symmetries, in turn, can foster the emergence of certain semimetallic states. In particular I will show that Weyl nodes are a generic feature of ALL materials in chiral space groups, i.e., in crystals with a sense of handedness. Second, I will discuss so-called higher-order topological insulators in which not the surface, but the hinges of a crystal carry topologically protected conducting states. Experiments on bismuth will be presented as evidence for this physics.

 

Last update: 20.06.2018 00:08.

venue 

Max-Planck-Institut für Chemische Physik fester Stoffe (Seminarraum 1+2, Nöthnitzer Straße 40, 01187 Dresden) 
Nöthnitzer Straße 40
01187 Dresden
e-mail
Max-Planck-Institut für Chemische Physik fester Stoffe 
homepage
http://www.cpfs.mpg.de/ 

organizer 

Max-Planck-Institut für Chemische Physik fester Stoffe (MPI-CPfS)
Nöthnitzer Straße 40
01187 Dresden
e-mail
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI-CPfS) 
homepage
http://www.cpfs.mpg.de/ 
Scan this code with your smartphone and get directly this event in your calendar. Increase the image size by clicking on the QR-Code if you have problems to scan it.