Title

Introducing Magnetic Order in a Topological Insulator via Chemical Doping

Presenter Information

Stephen Kraus

Department

Physics

Major

Physics

Research Advisor

Hor, Yew San

Advisor's Department

Physics

Abstract

Analysis of the topological insulator Bi2Se3 magnetically doped with various concentrations of Mn is performed. Magnetization measurements reveal paramagnetic behavior at low temperatures for a range of concentrations. Resistivity measurements and X-ray diffraction methods indicate that the bulk structure of the materials retain their desired properties and form after doping. Angle-resolved photoemission spectroscopy verifies the existence of topological surface states in the doped materials, but does not show the opened band gap associated with ferromagnetic ordering at the temperatures tested.

Biography

Stephen is a senior majoring in Physics and Applied Mathematics. He has been doing research in Dr. Hor's lab since the fall semester of 2012, and has been a LEAD Peer Learning Assistant on campus since fall of 2010. He intends to pursue a graduate degree in physics after graduation, perhaps in the areas of condensed matter or AMO physics.

Research Category

Sciences

Presentation Type

Oral Presentation

Document Type

Presentation

Location

Turner Room

Presentation Date

03 Apr 2013, 10:00 am - 10:30 am

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Apr 3rd, 10:00 AM Apr 3rd, 10:30 AM

Introducing Magnetic Order in a Topological Insulator via Chemical Doping

Turner Room

Analysis of the topological insulator Bi2Se3 magnetically doped with various concentrations of Mn is performed. Magnetization measurements reveal paramagnetic behavior at low temperatures for a range of concentrations. Resistivity measurements and X-ray diffraction methods indicate that the bulk structure of the materials retain their desired properties and form after doping. Angle-resolved photoemission spectroscopy verifies the existence of topological surface states in the doped materials, but does not show the opened band gap associated with ferromagnetic ordering at the temperatures tested.