Excited-state dynamics of structurally characterized crystal of SnxSb1-x

Abstract

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.

arXiv comment29 Pages Text + Figs

References in corpus (22)

• Topological Insulators
• Topological insulators and superconductors
• $Z_2$ Topological Order and the Quantum Spin Hall Effect
• Topological Insulators in Three Dimensions
• Topological Insulators with Inversion Symmetry
• Topological Photonics
• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• New directions in the pursuit of Majorana fermions in solid state systems
• Topological Insulator Materials
• Colloquium: Topological Band Theory
• Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator
• Band structure diagram paths based on crystallography
• Observation of topological order in a Superconducting doped topological insulator (based on the Bi2Se3 class)
• Ultrafast photocurrents at the surface of the three-dimensional topological insulator ${\mathrm{Bi}}_2{\mathrm{Se}}_3$
• Efficient Topological Materials Discovery Using Symmetry Indicators
• Nematic superconductivity in doped Bi2Se3 topological superconductors
• Superconductivity in Tl_{0.6}Bi_{2}Te_{3} Derived from a Topological Insulator
• Electronic structure of a superconducting topological insulator Sr-doped Bi2Se3
• Review of Ultrafast Spectroscopy Studies of Valley Carrier Dynamics in Two Dimensional Semiconducting Transition Metal Dichalcogenides
• Type-II Superconductivity below 4K in Sn0.4Sb0.6
• Supercondutivity in SnSb with natural superlattice structure
• Superconducting phase diagram and nontrivial band topology of structurally modulated Sn${}_{1-x}$Sb${}_x$