Accessibility Tools

Condensed Matter Physics Seminar

Condensed Matter Physics Seminar

TaAs and NiTe2 topological semimetals grown by molecular beam epitaxy

28-11-2023 14:00 - 15:00
Venue
Zoom seminar, Institute of Physics P.A.S.
Telephone
Email
This email address is being protected from spambots. You need JavaScript enabled to view it.
Speaker
Janusz Sadowski
Affiliation
Institute of Physics Polish Academy of Sciences and Faculty of Physics, University of Warsaw

Beside extensively studied topological insulators also some materials with zero energy gap -topological semimetals exhibit symmetry related properties leading to exotic behaviour of low energy excitations at certain points of the Brillouin zone where two electronic bands cross. Akin to topological insulators, crystal lattices of topological semimetals have to fulfil specific symmetry conditions: time reversal symmetry and/or inversion symmetry. Both symmetries must be accomplished in Dirac semimetals, whereas in Weyl semimetal one of them has to be broken. Topological semimetals exhibit many interesting features such as linear dispersion of charge carriers (Dirac and Weyl semimetals), inhibited back-scattering of bulk charge carriers (Weyl semimetals), chiral anomaly (Weyl semimetals), etc.

I will present experimental realizations of two topological semimetals grown as epitaxial layers by molecular beam epitaxy: NiTe2 Dirac semimetal and TaAs Weyl semimetal. Until recently both materials have been obtained as bulk crystals only, we have been the first to report MBE-grown TaAs layers [1]; moreover we have observed new, hitherto unknown crystallographic phase of epitaxial TaAs, also leading to Weyl semimetal properties.

[1] J. Sadowski, J. Z. Domagała, W. Zajkowska, S. Kret, B. Seredyński, M. Gryglas- Borysiewicz, Z. Ogorzalek, R. Bożek, and W. Pacuski, Cryst. Growth Des. 22, 6039 (2022).

Link to lecture video

 
 

List of Dates (Page event details)

  • 28-11-2023 14:00 - 15:00
Save
Cookies user preferences
We use cookies to ensure you to get the best experience on our website. If you decline the use of cookies, this website may not function as expected.
Accept all
Decline all
Read more
Essential
Essential cookies
These cookies are necessary for the correct operation of the website and therefore cannot be disabled on this level; the use of these cookies does not involve the processing of personal data. While you can disable them via your browser settings, doing so may prevent the website from working normally.
Accept
Analytical cookies
These cookies are particularly intended to enable the website administrator to monitor the website traffic statistics, as well as the sources of traffic. Such data is typically collected anonymously.
Google Analytics
Accept
Decline