News Column

New Solid State Physics Findings from Aalto University Reported

June 3, 2014

By a News Reporter-Staff News Editor at Physics Week -- Fresh data on Solid State Physics are presented in a new report. According to news reporting out of Espoo, Finland, by VerticalNews editors, research stated, "We theoretically study the magnetic polaron (MP) formation in a ferromagnetic graphene single-electron transistor (SET), which consists of a graphene quantum dot (QD) between two insulating layers, i.e., a ferromagnetic insulator EuO and a nonmagnetic substrate such as SiC. In the lateral direction, the QD is electrically coupled to source, drain and gate electrodes, so that the number of electrons can be controlled by the gate voltage."

Our news journalists obtained a quote from the research from Aalto University, "Due to a proximity effect at the EuO/graphene interface, i.e., the exchange interaction between the charge carriers in graphene and the localized magnetic electrons in EuO, there is a magnetic coupling between the graphene QD and EuO. Using Green's function technique an expression for the total free energy of the SET is derived, which is then minimized at the given temperature and gate voltage. This leads to the MP formation and a consequent local enhancement of the ferromagnetic properties of EuO at the EuO/graphene interface. The MP formation is enforced by the large Coulomb interaction between the carriers in graphene."

According to the news editors, the research concluded: "The spin polarization at the graphene/EuO interface in the QD area can be controlled by the gate voltage of the SET."

For more information on this research see: Magnetic polaron formation in graphene- based single- electron transistor. Physica Status Solidi B-Basic Solid State Physics, 2014;251(4):864-870. Physica Status Solidi B-Basic Solid State Physics can be contacted at: Wiley-V C H Verlag Gmbh, Boschstrasse 12, D-69469 Weinheim, Germany.

Our news journalists report that additional information may be obtained by contacting H. Savin, Aalto Univ, Sch Elect Engn, Dept. of Micro & Nanosci, Espoo 00076, Finland. Additional authors for this research include P. Kuivalainen, S. Novikov and N. Lebedeva.

Keywords for this news article include: Espoo, Europe, Finland, Solid State Physics

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Source: Physics Week

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