Excited-state dynamics of structurally characterized crystal of Sn x Sb 1-x
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Excited-state dynamics of structurally characterized crystal of SnxSb1-x Prince Sharma1,2 , M. M. Sharma1,2, Kapil Kumar1,2, Mahesh Kumar1,2, and V. P. S. Awana1,2,* 1 2
CSIR-National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi 110012, India Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
Received: 3 June 2020
ABSTRACT
Accepted: 21 September 2020
The topological behavior of heavy metal alloys opens a vast area for incredible research and future technology. Here, we extend our previous report about the superconducting properties of Sn0.4Sb0.6 along with the compositional variation of Sn and Sb in SnxSb1-x (with (X = 0.5 and 0.6)) to study the detailed optical properties. Structural and morphological details of grown crystal are carried from the previous study. Further, the samples are excited by a pump of 2.61 eV with a broad probe of 0.77–1.54 eV in the NIR regime for transient reflectance ultrafast studies (TRUS) measurements. The differential reflectance profile shows an unprecedented negative magnitude, and the average power-dependent analysis of this negative trend has been analyzed. This article not only provides evidence of band filling phenomenon in the samples but also shows that with the variation of average power, there is a definite increase in the excited charge carriers, and thereby enhancing the band filling response. The estimated value of the bandgap between the band filled states and valence state is also determined from these studies. The nonlinear properties and bandgap analysis of the studied topological alloys and similar materials help in the advancement of various nonlinear optical applications.
Published online: 29 September 2020
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Springer Science+Business
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Introduction Topologically protected states in a material give rise to a set of symmetries [1–6]. The incredible trend of the surface charges due to these regularities has gained tremendous attention. Recently, heavy metal
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https://doi.org/10.1007/s10853-020-05383-y
alloys too showed these kinds of characteristics due to the presence of strong spin–orbit coupling [1–10]. It makes them a novelistic candidate in the topological phase. The categories of materials that include them are the topological insulators (TIs) and topological semimetals (TSM) [1–4, 8–13]. The binary alloys made up of bismuth (Bi), and TSM antimony (Sb) is one of
1528 the artless examples of fusion exhibiting the Dirac cone nature. More precisely, BixSb1-x is the first material whose eccentric characteristics resemble the three-dimensional topological insulator [10, 12, 14]. A particular stoichiometric ratio of Bi and Sb causes band inversion as x falls in between 0.07 and 0.22 [10, 12, 14]. The specific range of ‘x’ opens a bandgap due to the band reversal and makes the surface conducting. TI shows numerous applications in the field of thermoelectric, spintronics, superconducting as well as op
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