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Spin Ratchet Effect for Spin Current Generation Dmitri E. Feldman (Brown University) DMR 0544116. The design of the spin current source [B. Braunecker, D. E. Feldman, and F. F. Li, Phys. Rev. B 76 , 085119 (2007) ].

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## Spin Ratchet Effect for Spin Current Generation Dmitri E. Feldman (Brown University) DMR 0544116

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**Spin Ratchet Effect for Spin Current GenerationDmitri E.**Feldman (Brown University) DMR 0544116 The design of the spin current source [B. Braunecker, D. E. Feldman, and F. F. Li, Phys. Rev. B 76, 085119 (2007)]. Modern electronics utilizes the electron charge but besides their charges, electrons posses spins. The electron spin opens new avenues for electronics and can potentially revolutionize technology through the possibility to combine electronics with quantum information processing. Such developments will crucially depend on the availability of the nanoscale sources of spin currents which should be generated independently from electric currents. We have discovered that a class of nanowires will serve as a basis for sources of spin currents with desirable properties, i.e., the spin current can be made much higher than the electric current. This will require combining a nanowire with an asymmetric barrier created, e.g., by an STM tip.**Freshman Seminar “Adventures in Nanowold”Dmitri E.**Feldman (Brown University)DMR 0544116 A new freshman seminar “Adventures in Nanoworld” (PHYS 0120) has been developed. The course has been open for all non-science and science concentrators and entailed a first introduction into modern developments of nanoscience and nanotechnology. Course descritpion:Richard Feynman famously said, "There's plenty of room at the bottom," about the possibility to build molecular-size machines operating according to Quantum Mechanics. Scientists are now learning the art. We will use basic physics and simple mathematical models to understand the phenomena and materials in the nanoworld. The course covers important classes of nanosystems such as macromolecules, nanotubes, quantum dots, quantum wires and films. We will learn how people make nanosystems and characterize them. We will consider existing and potential applications of nanotechnology including molecular motors, nanoelectronics, spintronics and quantum information. STM demo for PHYS 0120 The course involved numerous lab visits: Vacuum system from Xu’s nanotube Lab.

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