Uprzejmie zapraszamy na seminaria w ramach cyklu Modern Trends in Physics Research, które odbędą się: w środę, 5 kwietnia 2017 o godzinie 12:00 w sali 16. Speaker: Dr Pavel Baláž. Affiliation: Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Prague, Czech Republic Title: Magnetic properties of Bi2Se3 3D topological insulator doped by Mn atoms: theory and numerical simulations.
Abstract:
Electric
conductivity [1] and ferromagnetic Curie temperature of bulk Mn-doped
Bi2Se3 and Bi2Te3 3D topological insulators are systematically studied
by means of atomistic Monte Carlo simulations. Exchange interactions
between the Mn magnetic moments have been calculated using ab initio
methods. Tight-binding linear muffin-tin orbital method has been
employed, together with the coherent potential approximation to describe
the high degree of disorder in the system. Spin-orbit interaction is
included in the ground state calculation. In the studied materials Mn
atoms might either replace a Bi atom (substitutional position) or fill
an empty position in van Der Waals gap between the atomic layers
(substitutional position). It has been shown that exchange interaction
between Mn magnetic moments might lead to a ferromagnetic phase
transition. The Curie temperature is shown to be significantly dependent
on the concentration of Mn atoms in substitutional and interstitial
positions.
[1] K. Carva, J. Kudrnovský, F. Máca, V. Drchal, I. Turek, P. Baláž, V. Tkáč, V. Holý, V. Sechovský, J. Honolka, Phys. Rev. B 93, 214409 (2016).
Chair: MK
Zapowiedzi kolejnych seminariów można znaleźć na stronie MTPR
Z poważaniem,
Michał Banaszak
Maciej Krawczyk
Adam Miranowicz
Udostępnij:
Informację wprowadził/a: Marek Nowak
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