Surface Dynamics and Phononic Properties of 2D Field Tunable Auxetic Crystal

• Authors: D. Twaróg , D. Trzupek , P. Zieliński
• Languages of publication: EN

Abstracts

EN

The lattice in-plane dynamics is studied as a function of external field in a model of auxetic crystal consisting of rigid polar rods and of elastic springs. The phase speed of the transverse acoustic wave propagating parallel to the polar rods is shown to be higher than the speed of the longitudinal wave at strong fields. An absolute stop band for the lattice waves opens in the whole Brillouin zone with increasing field. The surface waves and resonances at a surface parallel to the rods are studied. Infinitely narrow resonances called exceptional surface waves are found within bulk bands at certain specific values of the parameters characterizing the surface. Generally, the surface layer should be significantly heavier and stiffer than the substrate for the phenomenon to occur.

Keywords

EN

63.20.D-; 68.35.Ja; 62.20.dj

Discipline

• 68.35.Ja: Surface and interface dynamics and vibrations
• 62.20.dj: Poisson's ratio
• 63.20.D-: Phonon states and bands, normal modes, and phonon dispersion

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 115
• Issue: 2
• Pages: 579-582

Dates

published

2009-02

Contributors

author

D. Twaróg

• The H. Niewodniczański Institute of Nuclear Physics, PAS, Radzikowskiego 152, 31-342 Kraków, Poland

author

D. Trzupek

• The H. Niewodniczański Institute of Nuclear Physics, PAS, Radzikowskiego 152, 31-342 Kraków, Poland
• Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland

author

P. Zieliński

• The H. Niewodniczański Institute of Nuclear Physics, PAS, Radzikowskiego 152, 31-342 Kraków, Poland
• Institute of Physics, Cracow Technical University, Podchorążych 1, 30-084 Kraków, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.115.579