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Anomalous sound propagation in a solid with a special acoustic phonon dispersion relation
| Content Provider | Scilit |
|---|---|
| Author | Goda, M. Okamura, M. Nishino, S. Okui, S. Tanaka, R. Kudo, M. |
| Copyright Year | 2007 |
| Description | Journal: Journal of Physics: Conference Series We investigate a new type of solids which has a special acoustic phonon dispersion relation of ω = $ak^{2}$ type. This has been partially observed in graphite. This type of solids usually has a mechanical instability under a homogeneous expansion or a homogeneous deformation and also has a thermal instability. These instabilities can be eliminated by introducing a small cut-off wave number or a suitable unharmonic inter-atomic interaction. We remove the former one by introducing the periodic boundary condition. Some general features of the peculiar "solid" are investigated theoretically and numerically. Especially we investigate the anomalous wave propagation of the dispersive acoustic phonons numerically. The computer simulation of the wave–packet dynamics shows us a stronger localisation character than that in a normal solid in the case of 1-dimensional disordered systems. |
| Related Links | http://iopscience.iop.org/article/10.1088/1742-6596/92/1/012155/pdf |
| ISSN | 17426588 |
| e-ISSN | 17426596 |
| DOI | 10.1088/1742-6596/92/1/012155 |
| Journal | Journal of Physics: Conference Series |
| Issue Number | 1 |
| Volume Number | 92 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2007-12-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Journal of Physics: Conference Series Acoustics and Ultrasonics 1 Dimensional Periodic Boundary Condition Computer Simulation Wave Propagation Dispersion Relation |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physics and Astronomy |
