The study of topological nontrivial materials Bezryadina Tatiana, - PowerPoint PPT Presentation

The study of topological nontrivial materials Bezryadina Tatiana, Faculty of Physics, Tomsk State University

Quantum Hall effect The quantization of the transverse resistance of two dimensional electron gas in a strong magnetic field.

Topological insulators Electronic materials that have a bulk band gap like an ordinary insulator but have protected conducting states on their edge or surface

Magnetization of Topological Surface States of Topological Insulators (a)Doping magnetic impurities (b)Chemical adsorption on the surface (c)Interfacial magnetic proximity (d)Magnetic extension

VSe CrSe a=3.91 Ȧ, c=6.23Ȧ a=3.88 Ȧ, c=6.28Ȧ

Bulk band structure

Bilayer VSe CrSe a=4.12 Ȧ , μ =3 μ B a=4.12 Ȧ , μ =4 μ B

Band structure

Heterostructure formed by subsurface incorporation of a ferromagnetic layer Total energy of TI+VSe (Se-top)= -34.10 eV TI+VSe (V-in)= -35.69 eV TI+CrSe (Se-top)= -34.74eV TI+CrSe (Cr-in)= -35.22 eV

VBi 2 Se 4 SL CrBi 2 Se 4 SL μ= 4 μ B μ =3 μ B

Band dispersion of the free-standing layer

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