ME Seminar Series: Physics on a Camelback: The Wonder and Applications of a Parallel Dipole Line System - A Novel Magnetic Trap and High Sensitivity Hall System

Mar 25

Wednesday, March 25, 2015

1:00 pm - 2:30 pm
Fitzpatrick Center Schiciano Auditorium Side A

I present a discovery of new context, where a one-dimensional "camelback" potential occurs, arising from elementary field sources¿i.e. in a "parallel dipole line" (PDL) system. This system can be realized with a pair of cylindrical magnets with diametrical magnetization. The camelback potential leads to several interesting applications: it enables a unique trap for cylindrical objects, produces a 1-D mechanical oscillator with tunable Q-factor and a system to measure the magnetic susceptibility of the trapped object. The PDL system also yields a surprising application for a high sensitivity Hall measurement using a rotating ¿master-slave¿ PDL configuration. This system played a decisive role in extracting low carrier mobility values in earth-abundant kesterite solar cells and in monitoring carrier density in perovskite solar cells; both are materials of high interest in photovoltaics. I will also discuss further exciting applications of the PDL system and its fascinating 1-D camelback potential.

Contact

Thompson, Michele
660-5321
mthomp@duke.edu

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