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Tuning Topological Surface States By Charge Transfer, Zhiyi Chen
Tuning Topological Surface States By Charge Transfer, Zhiyi Chen
Dissertations, Theses, and Capstone Projects
Three-dimensional (3D) topological insulators (TIs), Bi2Se3, Bi2Te3, Sb2Te3, are a class of materials that has non-trivial bulk band structure and metallic surface states. Access to charge transport through Dirac surface states in TIs can be challenging due to their intermixing with bulk states or non-topological two-dimensional electron gas quantum well states caused by bending of electronic bands near the surface. The band bending arises via charge transfer from surface adatoms or interfaces and, therefore, the choice of layers abutting topological surfaces is critical. Surfaces of these 3D TIs …