SFB/TRR 173 SPIN+X

Second Funding Period 2020-2023:

A10 Spin+Transport: Dynamic control of spin transport

Prof. Dr. Sebastian Eggert (Department of Physics, TU Kaiserslautern)

In project A10, theoretical predictions and analysis of state-of-the-art control of spin transport are investigated. The main focus will be on magnons in low-damping ferromagnetic materials like YIG, which have a great potential for future information technologies, but are also a prototypical model system for many-body behavior due to their long coherence times and versatile tuning possibilities. This project will go beyond mainstream calculations by considering coherent magnon states under time-dependent driving using Floquet theory. We will provide calculations for local time-periodic potentials, which have the capacity to become effective and highly tunable tools to manipulate transport.

 

First Funding Period 2016-2019:

A10  Spin+Charge: Scattering and tunneling in quasi one-dimensional magnetic nanowires

Prof. Dr. Sebastian Eggert (Department of Physics, TU Kaiserslautern)
Dr. Imke Schneider (Department of Physics, TU Kaiserslautern)

In project A10 the non-adiabatic transport of electrons in quasi one-dimensional wires across a domain wall will be analyzed theoretically. The feedback of the interacting electron current on the magnetic structure will be calculated with special focus on electron correlations. The interplay between domain walls and electrons is described by spin-spin coupling in terms of the s-d model, which is used to calculate the scattering due to the domain wall.  This in turn results in spin accumulation and spin torques on the magnetic structure.  We propose to combine state of the art numerical quantum Monte Carlo algorithms with established field theory methods in confined dimensions to achieve the following aims:

Aim 1: Understand the dependence of the non-adiabatic transport in a low dimensional wire on temperature, interaction strength, and the domain wall shape;

Aim 2: Derive the spin and charge density profiles of electrons for a steady-state (partially polarized) current across a domain wall and calculate the resulting effective force on the domain wall;

Aim 3: Gain a fundamental understanding of the electron correlations in the presence of domain walls.  Of particular interest is the effect of domain walls on the local tunneling density of states.

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