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Hypersonic modes in nanophononic semiconductors

Hepplestone, SP; Srivastava, GP; (2008) Hypersonic modes in nanophononic semiconductors. PHYS REV LETT , 101 (10) , Article 105502. 10.1103/PhysRevLett.101.105502. Green open access

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Abstract

Frequency gaps and negative group velocities of hypersonic phonon modes in periodically arranged composite semiconductors are presented. Trends and criteria for phononic gaps are discussed using a variety of atomic-level theoretical approaches. From our calculations, the possibility of achieving semiconductor-based one-dimensional phononic structures is established. We present results of the location and size of gaps, as well as negative group velocities of phonon modes in such structures. In addition to reproducing the results of recent measurements of the locations of the band gaps in the nanosized Si/Si0.4Ge0.6 superlattice, we show that such a system is a true one-dimensional hypersonic phononic crystal.

Type: Article
Title: Hypersonic modes in nanophononic semiconductors
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.101.105502
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.101.105502
Language: English
Additional information: © 2008 The American Physical Society
Keywords: PHONONIC BAND-GAPS, VIBRATIONS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1332942
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