SFB 689:  Spin Phenomena in Reduced Dimensions

• Subject Area: Physics
• Term: from 2006 to 2017
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 14086190

The focus of the Collaborative Research Centre is mainly on spintronics where one attempts to employ, in addition to the elementary charge of the carriers, their magnetic moment, the spin, as information carrier. To reach this goal, efficient spin injection, spin transport and the control, manipulation and detection of spin polarisation or of spin polarised currents are essential requirements. The central problem interconnecting all projects and project areas addresses the characterisation, control and manipulation of the spin degree of freedom in electronic systems of reduced dimension. As systems of reduced dimension we consider semiconductor-heterojunctions, containing low-dimensional charge carrier systems, tunnel junctions, thin layers of ferromagnetic semiconductor material (mainly GaMnAs), being nanopatterned or embedded in semiconductor heterojunctions, as well as mesoscopic systems, point contacts or molecular systems.
The Collaborative Research Centre is grouped into the three project areas A, B, and C. Project area A includes experimental and theoretical investigations of charge transport through nanotubes, wires and molecules. In project area B the focus is on the ferromagnetic semiconductor material GaMnAs and on heterojunctions involving GaMnAs layers. Projects in this area concentrate on growth and characterisation of fundamental morphological, electrical and magnetic material properties of GaMnAs as well as on application of such layers to investigate spin injection, spin polarisation, spin dependent tunnelling or current induced magnetisation switching. Project area C finally combines experimental and theoretical explorations on spin dependent phenomena in semiconductor heterojunctions and nanostructures, ferromagnet-superconductor and ferromagnet-semiconductor hybrid structures.
The long-term objective of the Collaborative Research Centre is on realisation of effective injection, manipulation and detection of spins in systems of reduced dimension. In addition the key components of a future room temperature spintronics shall be provided.

• DFG Programme: Collaborative Research Centres

Completed projects

• A01 - Spin-dependent transport in interacting carbon nanotubes (Project Heads Grifoni, Milena ;  Hüttel, Andreas Klaus ;  Strunk, Christoph )
• A02 - Spindiffusionslängen-Bestimmungen in nichtmagnetischen Nanodrähten mit beweglichen Nanokontakten (Project Heads Back, Christian ;  Vancea, Johann )
• A03 - Theoretical Investigation of Spin Dependent Transport through Carbon Nanotubes (Project Heads Cuniberti, Gianaurelio ;  Grifoni, Milena )
• A04 - Spin-dependent transport through individual molecules (Project Heads Donarini, Andrea ;  Grifoni, Milena ;  Repp, Jascha ;  Richter, Klaus )
• A06 - Spin dependent transport through individual molecules: scanning tunneling microscopy and spectroscopy (Project Head Repp, Jascha )
• A07 - Magnetism in graphene: spin transport and characterization on the atomicscale (Project Heads Eroms, Jonathan ;  Giessibl, Franz J. ;  Repp, Jascha ;  Strunk, Christoph )
• A08 - Spin effects in graphene (Project Heads Fabian, Jaroslav ;  Richter, Klaus )
• A09 - Experimental and theoretical investigations of spin-nanostructures built from single atoms (Project Heads Ebert, Hubert ;  Giessibl, Franz J. )
• A10 - Spin-dependent transport and recombination in organic semiconductors (Project Head Lupton, John )
• B01 - Molecular beam epitaxy of magnetic manganese-doped semiconductors (Project Heads Bougeard, Dominique ;  Schuh, Dieter ;  Wegscheider, Werner )
• B02 - Manipulation der statischen und dynamischen Eigenschaften von (Ga,Mn)As (Project Heads Back, Christian ;  Woltersdorf, Georg )
• B03 - Vielteilchenbeschreibung ferromagnetischer Halbleiter: Korrelationseffekte in elektrischen und magnetischen Eigenschaften (Project Heads Ebert, Hubert ;  Schliemann, John )
• B04 - Spin dynamics and spin diffusion in semiconductor heterostructures (Project Heads Korn, Tobias ;  Schüller, Christian )
• B05 - Magnetic semiconductor nanostructures: Non-equilibrium spin detection and transport (Project Head Weiss, Dieter )
• B06 - Spin injection from diluted magnetic semiconductors into semiconductor heterojunctions (Project Heads Back, Christian ;  Bayreuther, Günther ;  Ciorga, Mariusz ;  Weiss, Dieter )
• B08 - Elektronenmikroskopische strukturelle und mikromagnetische Charakterisierung von magnetischen Halbleitern (Project Head Zweck, Josef )
• B09 - Modeling and simulation of magnetic semiconductor device structures (Project Heads Fabian, Jaroslav ;  Kramer, Tobias )
• B11 - MBE Wachstum von ferromagnetischen Nanodrähten (Project Heads Bougeard, Dominique ;  Reiger, Elisabeth ;  Schuh, Dieter ;  Zweck, Josef )
• B12 - Disorder in ferromagnetic semiconductors (Project Heads Schliemann, John ;  Wenk, Paul Thomas )
• C01 - Spin Ratchet Effects and Resonant Spin Currents in Semiconductor Heterostructures and Hybrid Systems (Project Head Ganichev, Sergey )
• C02 - Rein elektrische Spininjektion durch Spin-Bahn-Wechselwirkung in gyrotropen Nanostrukturen (Project Heads Ganichev, Sergey ;  Molenkamp, Laurens W. ;  Wegscheider, Werner )
• C03 - Verdünnte Ferromagnete und Andreev-Reflektion in Supraleiter/Ferromagnet-Heterostrukturen (Project Heads Bayreuther, Günther ;  Ebert, Hubert ;  Strunk, Christoph )
• C04 - Spinabhängiger Transport heißer Elektronen (Project Heads Back, Christian ;  Bayreuther, Günther ;  Vancea, Johann )
• C05 - Transport properties of GaMnAs nanostructures and Fe/GaAs junctions (Project Heads Fabian, Jaroslav ;  Grifoni, Milena )
• C06 - Transport, Dynamics and Interaction Effects in Systems with Spin-Orbit Coupling (Project Heads Richter, Klaus ;  Schliemann, John )
• C07 - Electronic and Transport Properties of Two-Dimensional Magnetic and Spin-Polarized Heterostructures (Project Heads Fabian, Jaroslav ;  Schliemann, John )
• C08 - Spin Hall Effect in Metallic Heterostructures (Project Heads Back, Christian ;  Ebert, Hubert ;  Woltersdorf, Georg )
• C09 - Spin injection into silicon (Project Heads Bougeard, Dominique ;  Ciorga, Mariusz ;  Zweck, Josef )
• C11 - Ultrafast electric injection of spin-polarized tunnel currents in semiconductors (Project Heads Back, Christian ;  Bougeard, Dominique ;  Huber, Rupert )
• Z - Central Tasks (Project Head Weiss, Dieter )

• Applicant Institution: Universität Regensburg
• Participating University: Ludwig-Maximilians-Universität München
• Spokesperson: Professor Dr. Dieter Weiss