Avoided Band Crossing in Locally Periodic Elastic Rods

Details Avoided Band Crossing in Locally Periodic Elastic Rods Avoided Band Crossing in Locally Periodic Elastic Rods

2005-04-26

arxiv.org/abs/cond-mat/0504687v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 7 figures, some in color

Scientific paper

Avoided band crossings have been studied theoretically and it has been shown that they can provide a tunning of the metal-insulator transition. Here we present an experimental example of an avoided band crossing for a classical undulatory system: torsional waves in locally periodic rods. To excite and detect the torsional waves, an electromagnetic-acoustic transducer for low-frequencies that we have recently developed, is used. Calculations performed using the transfer matrix method agree with the experimental measurements. In the observed avoided band crossing one level, which is a border-induced bulk level, moves from one band to the next.

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