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Volumn 79, Issue 9, 2009, Pages

Excitation of longitudinal and transverse coherent acoustic phonons in nanometer free-standing films of (001) Si

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EID: 63249135326     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.79.094301     Document Type: Article
Times cited : (95)

References (30)
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    • The difficulty in solving the equations of elasticity is also due to three-dimensional character of the problem. The one-dimensional problem, which is relevant to experiments where the only excited mode is the longitudinal, has an analytic solution derived by Thomson (see Ref.). To our knowledge, the only treatment of the three-dimensional problem is the one proposed by Pezeril (Refs.). However, these are for different geometries and boundary conditions than the free-standing film
    • The difficulty in solving the equations of elasticity is also due to three-dimensional character of the problem. The one-dimensional problem, which is relevant to experiments where the only excited mode is the longitudinal, has an analytic solution derived by Thomson (see Ref.). To our knowledge, the only treatment of the three-dimensional problem is the one proposed by Pezeril (Refs.). However, these are for different geometries and boundary conditions than the free-standing film.
  • 28
    • 63249110363 scopus 로고    scopus 로고
    • Although we excite the sample at ∼320 K, the thermal-expansion coefficient of Si of 2.6× 10-6 K-1 is approximately ten times smaller than that of elements examined in other studies. For example, in Zn the c -axis coefficient is 6.4× 10-5 K-1 and the one along the perpendicular is 1.3× 10-5 K-1 (Ref.). Therefore, this strong excitation is needed to generate sufficient strains to observe the effect.
    • Although we excite the sample at ∼320 K, the thermal-expansion coefficient of Si of 2.6× 10-6 K-1 is approximately ten times smaller than that of elements examined in other studies. For example, in Zn the c -axis coefficient is 6.4× 10-5 K-1 and the one along the perpendicular is 1.3× 10-5 K-1 (Ref.). Therefore, this strong excitation is needed to generate sufficient strains to observe the effect.


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