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Acta Physica Sinica (Overseas Edition), 1994, Vol. 3(2): 141-149    DOI: 10.1088/1004-423X/3/2/008
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev  

BRILLOUIN LIGHT-SCATTERING INVESTIGATION OF ELASTIC ANOMALY FROM SUPERLATTICES

XIA HUA (夏桦), ZHANG WEI (张维), HU AN (胡安), JIANG SHU-SHENG (蒋树声), ZHANG XING-KUI (张杏奎)
State Key Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210008, China
Abstract  In this paper we report some new experimental results concerning the elastic properties of periodic and quasiperiodic superlattices studied by means of Brillouin spectroscopy. The observation of both bulk and surface acoustic phonons as well as the fitting using effective medium approximation on the phonon spectrum enables us to extract accurately some rele-vant effective elastic constants in both structures. We have verified that the elastic anomaly which occurs in the periodic structures is also present in quasiperiodic ones. These results imply that the interaction mechanism of Fermi electrons with reduced Brillouin zone bound-ary is not responsible for the observed elastic anomalies, The comparative study of these superlattices proves that the elastic anomaly is relevant directly to interfacial effects.
Received:  10 March 1993      Accepted manuscript online: 
PACS:  78.35.+c (Brillouin and Rayleigh scattering; other light scattering)  
  78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials)  
  68.35.Iv (Acoustical properties)  
  62.20.D- (Elasticity)  
  68.35.Ja (Surface and interface dynamics and vibrations)  
Fund: Project supported by the National Natural Science Foundation of China and by the funds of State Education Committee of China for outstanding young teachers.

Cite this article: 

XIA HUA (夏桦), ZHANG WEI (张维), HU AN (胡安), JIANG SHU-SHENG (蒋树声), ZHANG XING-KUI (张杏奎) BRILLOUIN LIGHT-SCATTERING INVESTIGATION OF ELASTIC ANOMALY FROM SUPERLATTICES 1994 Acta Physica Sinica (Overseas Edition) 3 141

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