Superconductivity Induced by Nb Doping in Bi2Se3 Topological Insulator
Department
Physics
Major
Physics
Research Advisor
Hor, Yew San
Advisor's Department
Physics
Abstract
Topological insulators (Tis) are new emerging quantum materials with insulating bulks but conducting Dirac surface states. Doped Tis have depicted variety of bulk electronic properties. Here, we show that by Nb doping in Bi2Se3 Tis, we can induce superconductivity in the Tis with Tc - 3.2 K without destroying the topological surface states. Zero resistivity and Meissner effect of the Nb-doped Bi2Se3 Tis will be shown. Our heat capacity measurement on the Nb-doped Bi2Se3 suggests that this newly discovered superconductor could be a topological superconductor, which has bulk superconductivity but Majorana fermionic surface conductivity.
Biography
Yunsheng is a cooperative cultivation student with Harbin Industrial Institute of Technology. He came to MS& T last summer and spent time working with Dr. Hor on the doped topological insulator project.
Research Category
Sciences
Presentation Type
Oral Presentation
Document Type
Presentation
Location
Upper Atrium/Hallway
Presentation Date
03 Apr 2013, 9:00 am - 11:45 am
Superconductivity Induced by Nb Doping in Bi2Se3 Topological Insulator
Upper Atrium/Hallway
Topological insulators (Tis) are new emerging quantum materials with insulating bulks but conducting Dirac surface states. Doped Tis have depicted variety of bulk electronic properties. Here, we show that by Nb doping in Bi2Se3 Tis, we can induce superconductivity in the Tis with Tc - 3.2 K without destroying the topological surface states. Zero resistivity and Meissner effect of the Nb-doped Bi2Se3 Tis will be shown. Our heat capacity measurement on the Nb-doped Bi2Se3 suggests that this newly discovered superconductor could be a topological superconductor, which has bulk superconductivity but Majorana fermionic surface conductivity.
