Investigation on the growth of Bi_2Te_3 thin films on CaF_2 and BaF_2 substrates by pulsed laser deposition

摘要

Topological superconductivity and half integer quantum Hall states are just a few examples of topological states that can be studied on the surface of topological insulators. Owing to proximity effects between TIs and superconductors or ferromagnets, these effects have been studied for Bi_2Se_3/Bi_2Sr_2CaCu_2O_(8+δ) or Bi_2Te_3/YIG. High-quality Bi_2Te_3 thin film are therefore of utmost importance though their availability is limited due to difficulties in materials synthesis. In this study, we have investigated the thermodynamic growth conditions of Bi_2Te_3 thin films on the alkaline earth fluoride substrate using pulsed laser deposition.