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Electron transport and Nanomagnetism
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics .
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics .
2008 (English)In: Nordforsk Network in Nanospintronics Theory and Simulations,2008, 2008Conference paper, Published paper (Other academic)
Abstract [en]

 Electron states, local magnetization and conductance in realistic quantum point contacts (QPCs) with different geometry and applied gate voltages will be discussed for a model GaAs/AlGaAs device. Using the local spin density approximation (LSDA) we recover ferromagnetic spatially split solutions in the pinch-off regime as well as antisymmetric solutions that occur with increasing voltage. These kind of spin states, which may appear in a repeated fashion in the few electron regime, are precursors to an extended ferromagnetic state that may be associated with the 0.7 (2e2/h) conductance anomaly. As the length of the QPC increases, so does the spin polarization and the difference in conductance between up-spin and down-spin electrons, resulting in movement of 0.7 anomaly towards the value of 0.5 (2e2/h). Due to the strong ferromagnetic spin polarization in a long QPC it will effectively work as a spin filter which may be useful for spintronics application. 

Place, publisher, year, edition, pages
2008.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-44586Local ID: 77138OAI: oai:DiVA.org:liu-44586DiVA: diva2:265448
Available from: 2009-10-10 Created: 2009-10-10

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Berggren, Karl-FredrikYakymenko, Iryna

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