Introducing Magnetic Order in a Topological Insulator via Chemical Doping
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
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.
