Nuclear spin polarization in silicon nanostructures with charge carrier injection

Spin and Charge Transfer in Selected Nanostructures

The general theme in this thesis is the interplay between electron spin and charge in nanoscale transport phenomena. The main presentation is divided into three independent chapters. In chapter 2, we propose a mechanism that explains the excess damping and dynamic exchange interactions which are observed in ferromagnet/paramagnet hybrids. A moving ferromagnetic magnetization emits spin current ...

Dynamic nuclear spin polarization in an all-semiconductor spin injection device with (Ga,Mn)As/n-GaAs spin Esaki diode

Charge-induced spin polarization in thiophene oligomers

Charge-induced spin polarization in small organic molecules is a key factor for spin transport and magnetic effects in related organic devices. In this work, we study spin polarization in charged thiophene oligomer molecules by calculating the magnetic moment with density functional theory. It is found that the emergence and variation of the net magnetic moment is related to both the amount of ...

Spin injection and detection in silicon.

Spin injection and detection in silicon is a difficult problem, in part because the weak spin-orbit coupling and indirect gap preclude using standard optical techniques. Two ways to overcome this difficulty are proposed, both based on spin-polarized transport across a heterojunction. Using a realistic transport model incorporating the relevant spin dynamics of both electrons and holes, it is ar...

Polarization-induced Charge Distributions at Polytype Interfaces in Semiconductor Nanostructures

Heterocrystalline polytype structures consist of chemically identical but structurally different materials, which act as barriers for electron transport, leading to charge accumulation in certain regions due either to band offsets at the polytype interfaces [1], or spontaneous polarization in the polytype regions with asymmetric structures [2]. Off-axis electron holography enables quantitative ...