Title

Superconductivity Induced by Nb Doping in Bi2Se3 Topological Insulator

Presenter Information

Yunsheng Qiu

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

This document is currently not available here.

Share

COinS
 
Apr 3rd, 9:00 AM Apr 3rd, 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.