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Projects C1-C9

A [1] [3] [4] [5] [6] [7] [8]     B [1] [2] [3] [4] [6] [7] [8] [9]     C [1] [2] [5] [7] [8] [9]     Z [3] [4]

 

C1 Spin-dependent properties of III-Nitride nano-heterostructures

Principal investigator:

Summary:

The goal of this project is to design, fabricate and study novel magnetic hybrid nanostructures combining II-VI diluted magnetic semiconductors like (Zn,Cd,Mn)/(Se,S,Te) and III-V semiconductors like (Al,Ga,In,Mn)/As. The focus will be on the development of heterovalent heterostructures, including quantum wells and dots, with coherent III-V/II-VI interfaces, taking advantage of the unlimited solubility of Mn-ions in the II-VI compounds and the excellent charge and spin properties of the nonmagnetic III-V compounds. As a result, different spintronic functions will be implemented in the heterovalent structures, including electrical and optical control over spin polarization, spin coherence, and spin ordering.

 

C2 Ferromagnetic proximity effect in ferromagnetic-semiconductor hybrid structures

Principal investiagtors:

Associated: Dr. Olga Ken (Ioffe Institute)

Summary:

The project focuses on the coupling of spins in a ferromagnet to carrier spins in a non-magnetic semiconductor close to the ferromagnet/semiconductor interface (the proximity effect). We will study the two main mechanisms responsible for the proximity effect: spin dependent tunneling through the interface and s-d (p-d) exchange interaction between electrons (holes) and magnetic ions. The strength of each of the mechanisms will be optimized by a proper choice of ferromagnetic material. Finally, we will concentrate on optical and electrical control of the ferromagnet‘s magnetization in hybrid structures with strong exchange interaction.

 

C5 Enhanced magneto-optics in plasmonic structures

Principal investigators:

Summary:

The project focuses on the interaction between surface plasmon polaritons (SPPs) and magnetic ions in semiconductors. Magneto-plasmonic crystals consisting of periodically patterned noble metal films or nanoparticles (Au, Ag) on top of paramagnetic (CdMnTe) or ferromagnetic (GaMnAs) semiconductor nanostructures will be studied spectroscopically. We will elaborate the possibilities for optical orientation of excitons by SPP excitation and exploit the strong sp-d exchange interaction between excitons and magnetic ions for optical control of SPP propagation and magnetization.

 

C7 Spin resonance: ESR-NMR with optical detection

Principal investigators:

Associated: Prof. Dr. Dmitri Yakovlev (TU Dortmund) as well as Dr. Nikolai Romanov (Ioffe Institute)

Summary:

This project investigates electrons that are confined in nanostructures or trapped at impurity sites or defects and their interactions with nuclear spins. We use optical polarization to generate spin-polarized states and drive them with resonant microwave and radiofrequency fields. Detection of the time-dependent spin-polarization relies mostly on optical techniques. These studies will provide a detailed view of the interaction between the spins and their environment. This includes electric fields that confine the electrons and interact with the nuclei through the nuclear quadrupole moment.

 

C8 Spin-induced optical harmonics generation in semiconductors and low-dimensional structures

Principal investigators:

Associated: Prof. Dr. Roman Pisarev (Ioffe Institute)

Summary:

Second- and third optical harmonic generation (SHG and THG) spectroscopy as well as multi-photon absorption and photoluminescence excitation will be used to study the exciton states in the vicinity of the band gap of ZnSe and Cu2O bulk semiconductors, of diluted magnetic semiconductors like CdMnTe, ZnMnSe and GaMnAs, and of quantum wells based on various III-V and II-VI materials. The spin and energy level structure in these systems will be investigated by placing the focus on new mechanisms involving spin-induced optical nonlinearities in external magnetic fields.

 

C9 Tailoring macroscopic functionalities in a semiconducting oxide

Principal investigators:

Associated: Dr. Davide Bossini (TU Dortmund)

Summary:

In project C9 we aim at controlling both the steady and the transient functionalities in the ferromagnetic oxide semiconductor EuO. Two complementary approaches will be employed: advanced crystal engineering - to control the steady state, and femtosecond optical excitation - to control the transient state. The advanced engineering approach relies on the preparation and characterization of EuO thin films in different lateral configurations and dimensions to generate epitaxial strain, proximity, or quantum confinement effects. As a following step, we will employ time-resolved magneto-optical and photoemission experiments to explore the femtosecond electron and spin dynamics with the main aim of manipulating the magnetic order in the steady-states induced via advanced crystal engineering.



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Contact

ICRC - TRR 160
Katharina Sparka
Technische Universität Dortmund
Otto-Hahn-Straße 4a
D-44227 Dortmund
Germany

 

Office

Phone +49 (0)231 755 2041
Fax +49 (0)231 755 3674

 

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