Hepplestone, SP;
Srivastava, GP;
(2008)
Hypersonic modes in nanophononic semiconductors.
PHYS REV LETT
, 101
(10)
, Article 105502. 10.1103/PhysRevLett.101.105502.
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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 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 |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1332942 |
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