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If the originally flat bottom of a wide quantum well with multiple eigenstates is periodically modulated, its eigenvalues rearrange into denser groups separated by wider gaps. We show that this effect, if implemented in an elongated bottle microresonator (also called a SNAP microresonator) allows to design microwave photonic tunable filters with an outstanding performance.

Ellen Finnie Duranceau, Following Removal of DRM, MIT Resubscribes to SAE Database, MIT Libraries News, March 4, 2008. See also the comments at Boing Boing, and past OAN posts on this topic. Update. See also the story from Library Journal Academic Newswire.

A quench in an underdamped one dimensional $φ^4$ model is studied by analytical methods. The density of kinks just after the transition is proportional to the square root of the rate of the quench for slow quenches. If the quench is shorter that the relaxation time, then the density scales like the third root of the rate.