Vibrational spectra of Pb₂Bi₂Te₃, PbBi₂Te₄, and PbBi₄Te₇ topological insulators: temperature-dependent Raman and theoretical insights from DFT simulations

Abstract

Insertion of lead and lead telluride in Bi2Te3 leads to a change in the thermal conductivity, frequency shift, and the broadening of phonon modes.

Polytypism and Polysomatism in Mixed-Layer Chalcogenides: Characterization of PbBi4Te4S3 and Inferences for Ordered Phases in the Aleksite Series

“…Similar approaches to modularity as given by [9] were followed in more recent studies of phase stability, thermoelectric properties and low phonon thermal conductivity of the infinitely adaptive nBi 2 .mBi 2 Te 3 chalcogenide series of synthetic compounds (e.g., [11][12][13]). Temperature-dependent changes in the 3D topological insulator Bi 2 Te 3 upon insertion of Pb and PbTe layers have been shown using Raman analysis and Density Function Theory simulations [14].…”

“…This is complemented by the recognition of widespread polytypism in the present study, whereby defined compositions may be represented by more than a single structure. Interest in Bi-chalcogenide structures remains very high, given the value of such compounds and their derivatives for thermoelectric energy conversion and as topological insulators [11][12][13][14][30][31][32], with aleksite series phases singled out for attention in some recent studies [33,34].…”

Study of vibrational properties of Bi2 − xMnxTe3 nanocrystals in host glass: Effect of xMn‐concentration

“…The structural properties of the DMS NC are also investigated with the study of vibrational modes by Raman spectroscopy. Raman scattering is a fast and nondestructive technique to get insight into the electron–phonon interactions and the phonon dynamics in several materials, such as topological insulators [ 30 ] and, mainly, DMS NCs. [ 6 ] The vibrational modes of the DMS NC show changes with the concentration of TM‐ions, as reported for Sb 2 − x Mn x S 3 , [ 29 ] Bi 2 − x Cr x S 3 , [ 31 ] Cd 1 − x Mn x S, [ 6 ] Cd 1 − x Co x S, [ 32 ] and Zn 1 − x Mn x O NCs.…”

“…Due to the inversion symmetry of the crystal, these phonon modes are exclusively Raman‐ and IR‐active. [ 30,33–37 ] Thus, the 12 optical modes provided by group theory are described by 2 A 1 g +2 E g +2 A 2 u +2 E u for the Bi 2 Te 3 crystal structure. [ 33–42 ]…”

Realization of Opened and Closed Nodal Lines and Four- and Three-fold Degenerate Nodal Points in XPt (X = Sc, Y, La) Intermetallic Compound: A Computational Modeling Study

“…In the last decade, with the discovery of topological insulators (Cava et al, 2013;Kou et al, 2013;Zhao et al, 2013;Shen and Cha, 2014;Wang et al, 2014;Luo et al, 2015;Zhou et al, 2015;Liu et al, 2016;Chen et al, 2017a;Loïc and Izmaylov, 2017;Pan et al, 2017;Pielnhofer et al, 2017;Politano et al, 2017;Andrey et al, 2018;Hu et al, 2018Hu et al, , 2019Gao et al, 2019;Mal et al, 2019;Qiao et al, 2019;Narimani et al, 2020), topologically non-trivial materials have attracted significant interest in the chemistry, physics, and materials science communities. Recently, studies have increasingly focused on topological semimetals/metals (Bin et al, 2018;Chenguang et al, 2018;Zhou et al, 2018;He et al, 2019He et al, , 2020Jin et al, 2019aJin et al, , 2020bLi et al, 2019;Qie et al, 2019;Xie et al, 2019;Yi et al, 2019;Zhong et al, 2019;Ma and Sun, 2020;Meng et al, 2020b;Wang et al, 2020a,c,d;Yang and Zhang, 2020;Zhang et al, 2020;Zhao et al, 2020) with non-trivial band topology.…”