400 research outputs found
D=6 massive spinning particle
The massive spinning particle in six-dimensional Minkowski space is described
as a mechanical system with the configuration space ${\ R}% ^{5,1}\times {\
CP}^36d$ fields.Comment: 8 pages, LaTe
Giant conductance oscillations in a normal mesoscopic ring induced by an SNS Josephson current
A theoretical explanation of giant conductance oscillations observed in
normal mesoscopic rings with superconducting ``mirrors" is proposed. The effect
is due to resonant tuning of Andreev levels to the Fermi level, which enhances
the transparency of the system to the normal current. The mechanism is
demonstrated for a one-dimensional model system.Comment: 10 pages, RevTeX, 3 fig. available upon request, Appl. Phys. Report
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Nanomechanics of a magnetic shuttle device
We show that self sustained mechanical vibrations in a model magnetic shuttle device can be driven by both the charge and the spin accumulated on the movable central island of the device. Different scenarios for how spin- and charge-induced shuttle instabilities may develop are discussed and shown to depend on whether there is a Coulomb blockade of tunneling or not. The crucial role of electronic spin flips in a magnetically driven shuttle is established and shown to cause giant magnetoresistance and dynamic magnetostriction effects
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