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Götte, Matthias: Topological insulator based spintronics: Theoretical investigation of pure spin current devices and polarization measurements. 2017
Inhalt
Introduction
Thematic background
Topological insulators
Quantum anomalous Hall effect
Spintronic
Model Hamiltonian
Effective model for the Bi2Se3 class of 3D TIs
Tight-binding-approximation
Tetragonal lattice
Hexagonal lattice
Analytical dispersion and surface states
Pure spin current devices and quantum transport calculations
Evolution of edge states in a ferromagnetic exchange field
Transport algorithm
Wave packets
Numerical time-evolution
Boundary conditions
Observables
2D transport calculations
Out-of-plane field
In-plane field
Parameter stability
Pure spin current devices
Generator
Detector
Transistor
Towards more realistic modeling
Domain walls
Finite thickness
Material imperfections
Broken structural inversion symmetry
Inhomogeneous exchange field
Summary
Meservey Tedrow method
Derivation
Influence of the out-of-plane polarization
Geometrical factor
Spin diffusion length
Summary
Spin Hall effect tunneling spectroscopy
Derivation
Numerical test
Summary
Summary and conclusion