Phys. Rev. Lett. 90, 104302 (2003) [4 pages]Lattice Dynamics and Melting of a Nonequilibrium PatternReceived 1 October 2002; published 14 March 2003 We present a new description of nonequilibrium square patterns as a harmonically coupled crystal lattice. In a vertically oscillating granular layer, different transverse normal modes of the granular square-lattice pattern are observed for different driving frequencies (fd) and accelerations. The amplitude of a mode can be further excited by either frequency modulation of fd or reduction of friction between the grains and the plate. When the mode amplitude becomes large, the lattice melts (disorders), in accord with the Lindemann criterion for melting in two dimensions. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.104302
DOI:
10.1103/PhysRevLett.90.104302
PACS:
45.70.Qj, 47.54.+r, 89.75.Kd
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.