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Topological insulators with their topological protected surface states arehighly promising quantum materials. In this article the micro-flakes ofsingle-crystalline topological insulators Bi2Te3 and Sb2Te3 are exploredthrough physical parameter measurement at low temperatures and thereby thecharge carrier dynamics are investigated at 5K to study the various opticaltransitions related to these surface states. The magnetoresistance isexperimentally investigated at temperatures of 5K and 100K for a field range of1Tesla. The occurrence of the weak anti-localization effect predicts thepresence of topologically protected surface states in the systems. Further, theultrafast femtosecond transient reflectance spectroscopy is performed atdifferent temperatures, varying from a room temperature (300K) to a lowtemperature of 5K, to find the TSS related transitions at low temperatures.

Probing the Topological Surface States through Magnetoresistance and Ultrafast Charge Carrier Dynamics in (Bi/Sb)2Te3