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

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Apr 30, 2023 108 likes •240 views

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.

SLIDE 1

The study of topological nontrivial materials

Bezryadina Tatiana, Faculty of Physics, Tomsk State University

SLIDE 2

Quantum Hall effect

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

SLIDE 3

Topological insulators

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

SLIDE 4

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

SLIDE 5

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

SLIDE 6

Bulk band structure

SLIDE 7

Bilayer

VSe a=4.12Ȧ, μ=3μB CrSe a=4.12Ȧ, μ=4μB

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Band structure

SLIDE 9

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

SLIDE 10

CrBi2Se4SL μ=4μB

VBi2Se4SL μ=3μB

SLIDE 11

Band dispersion of the free-standing layer

SLIDE 12