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Monday, August 11 • 14:00 - 16:15
Material Structure I

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Steffen Bieker

Polytypism in ZnSe Nanowires Revealed by Photoluminescence Excitation Spectroscopy of Embedded Single (Zn,Cd)Se Quantum Dots

Co-authors: Rebekka Pfeuffer, Tobias Kiessling, Nadezda Tarakina, Claus Schumacher, Wolfgang Ossau, Laurens W. Molenkamp, Grzegorz Karczewski

Invited: Zhihong Chen

Optimizing Spin-Transfer Torque in Graphene Spin Devices

Graphene is an ideal channel material due to its long spin diffusion length, gate-tunable carrier density, and high carrier mobility. However, to further develop a graphene-based spin logic, spin transfer torque needs to be demonstrated in graphene devices to show that spin information can be communicated to the outputs. The first experimental measurement of spin transfer torque in graphene lateral non-local spin valve devices has been reported by us. Assisted by an external magnetic field, the magnetization reversal of the ferromagnetic receiving magnet is induced by pure spin diffusion currents from the input magnet. The magnetization switching is reversible between parallel and antiparallel configurations, depending on the applied charge current polarity. In this talk, I will show a new graphene spin device design to improve the spin absorption at the output magnet. The measured nonlocal spin valve signal has lower noise and its magnitude is comparable to a conventional graphene spin device. More importantly, the critical spin torque current density is greatly reduced.

Oral: Laurent Pedesseau

Hybrid Perovskites for Solar Cells: A Change of Paradigm Toward Conventional Semiconductors
Co-authors: Alain Roland, Claudine Katan, Jacky Even

Ruediger Schott

Focused Ion Beam Induced Growth of Single III-V Nanowires on Arbitrarily Arranged Sites

Co-authors: Sven Scholz, Dirk Reuter, Arne Ludwig, Andreas D. Wieck

Oral: Alejandro R. Goni

Strain Engineering in Micromachined Germanium Epitaxial Layers
Co-authors: Pablo O. Vaccaro, Daiki Sodeoka, Hideki Kuruma, Masahiro Yoshimoto, María Isabel Alonso, Miguel Garriga

Gintare Statkute

Semiconductor Epitaxy on the Metals

Marco Felici

Berry-Phase Translation Effect in Strain-Engineered Hydrogenated Dilute Nitrides: A Novel Approach to X-Ray Photonics
Co-authors: Giorgio Pettinari, Simone Birindelli, Michela Fratini, Antonio Polimeni, Luisa Barba, Annamaria Gerardino, Luca Businaro, Andrea Notargiacomo, Alessia Cedola, Gaetano Campi, Silvia Rubini, Faustino Martelli, Mario Capizzi 

Session Chairs

Lars-Erik Wernersson

Professor & Nanoelectronics Research Group Director, Lund University
Lars-Erik Wernersson is directing a research group in Nanoelectronics in Lund working with applications of nanotechnology in IT. He has activities both related to nanoscience at the Physics Department and to hardware implementation at the Electrical- and Information Technology Department. He has been scientific coordinator and co-PI in several major research programs at either department, for instance Quantum Materials (SSF), Nano-Science for... Read More →


Zhihong Chen

Associate Professor, Purdue University
Zhihong Chen received her B.S. degree in physics from Fudan University in 1998, and her Ph.D. degree in physics from the University of Florida in 2003. After two years of postdoctoral research at IBM T.J. Watson research center, she became a research staff member in the Physical Science Department. Her research focused on design and fabrication of high performance carbon based devices and circuits. In 2008, she was appointed as the manager of the... Read More →

Monday August 11, 2014 14:00 - 16:15
Room 17B

Attendees (10)