Gate-Tunable Ambipolar Josephson Current in a Topological Insulator
This study demonstrates gate-tunable ambipolar Josephson current in molecular beam epitaxy-grown bulk-insulating (Bi,Sb)₂Te₃ thin films, revealing distinct transport behaviors between thin and thick films and establishing a critical foundation for realizing Dirac-surface-state-mediated topological superconductivity and Majorana modes.