1,494 research outputs found
Particle creation by moving spherical shell in the dynamical Casimir effect
The creation of massless scalar particles from the quantum vacuum by
spherical shell with time varying radius is studied. In the general case of
motion the equations are derived for the instantaneous basis expansion
coefficients. The examples are considered when the mean number of particles can
be explicitly evaluated in the adiabatic approximation.Comment: 9 pages, LaTeX, no figures, typos corrected, discussion added.
Journal-ref adde
Ambipolar Graphene Field Effect Transistors by Local Metal Side Gates
We demonstrate ambipolar graphene field effect transistors individually
controlled by local metal side gates. The side gated field effect can have
on/off ratio comparable with that of the global back gate, and can be tuned in
a large range by the back gate and/or a second side gate. We also find that the
side gated field effect is significantly stronger by electrically floating the
back gate compared to grounding the back gate, consistent with the finding from
electrostatic simulation.Comment: 4 pages, 3 figure
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