R. M. Sardarly, A. Z. Badalov, A. P. Abdullayev, T. N. Vezirova, F. Garet, J.-L. Coutaz, A. A. Oruzhova, “Peculiarities of terahertz spectra of layered TlInS<nobr>$_{2}$</nobr> crystals”, Fizika Tverdogo Tela, 2016, Volume 58, Issue 1,Pages <nobr>27

Semiconductors

Peculiarities of terahertz spectra of layered TlInS$_{2}$ crystals

R. M. Sardarly^a, A. Z. Badalov^b, A. P. Abdullayev^a, T. N. Vezirova^b, F. Garet^cd, J.-L. Coutaz^cd, A. A. Oruzhova^b

^a Institute of radiation problems, ANAS, Baku,Azerbaijan
^b National Academy of Aviation, Baku
^c Centre National de la Recherche Scientifique, Paris, France
^d Universite de Savoie, France

Abstract: Vibrational spectra of TlInS$_{2}$ crystals in the terahertz frequency range (0.1–3 THz) have been obtained and analyzed. The observed low-frequency band is attributed to the libration oscillations of nanolayers (so-called boson peak). A correlation between the coherent low-frequency oscillation and a disordered character of the crystal structure is shown. A conclusion is made on the presence of a topological disorder that manifests itself on the layered subsystem level.

Keywords: Boson Peak, Acoustic Branch, Terahertz Frequency Range, Topological Disorder, Terahertz Spectrum.

Received: 20.10.2014
Revised: 10.06.2015