Direct evidence of intercalation in a topological insulator turned superconductor
Topological insulators are one of the most interesting candidates in contemporary research because of their remarkably different surface and bulk states. Due to strong spin-orbit coupling these materials show relatively longer range quantum entanglement which makes them suitable for building next generation quantum computational devices. Amongst other such materials, Bi2Se3 is of particular importance due to its large bulk band gap and surface states with a single Dirac fermionic mode which shows a linear, lightlike dispersion. Recently Bi2Se3 came into the limelight by showing superconductivity when doped with Cu. While an intercalated CuxBi2Se3 (0.1
For the first time, this study reveals the presence of intercalated structure at nanoscale within the bulk material which is supposed to be the prime reason for supercounductivity in doped topological insulator. A careful study exhibits the presence of two intercalation sites in this material when projected along the [-1-1 0] direction. Stoichiometry of the intercalated unit cell was also calculated from the projected mean inner potential.
Direct evidence of intercalation in a topological insulator turned superconductor Tanmay Das, Somnath Bhattacharyya, Bhanu Prakash Joshi, Arumugum Thamizhavel, Srinivasan Ramakrishnan, Materials Letters, 98, 330-373, 2013.