Upcoming Events

05/23/2017 1:10 PM - 2:00 PM
Scientific Advisor, Schlumberger-Doll Research Yiqiao Song
Location: 3043 ECpE Building Addition, Iowa State University
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Previous Events

04/10/2017 4:10 PM - 5:00 PM
IEEE Lecture Jun Cui
Location: 3043 ECpE Building Addition, Iowa State University
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04/13/2016 1:00 PM - 2:00 PM
IEEE Distinguished Lecture Josep Fontcuberta
Location: 3043 ECpE Building Addition, Iowa State University
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03/15/2016 1:10 PM - 2:00 PM
IEEE Distinguished Lecture Greg Carman
Location: 3043 ECpE Building Addition, Iowa State University
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Chapter Officers

Chair:
Jimming Song
Email: jisong@iastate.edu
Phone: 515-294-8396
Fax:

Financial Secretary:
Helena Khazdozian
Email: helenak@iastate.edu

Webmaster:
Priyam Rastogi
Email: priyamr@iastate.edu

Magnetics Reaseach Groups/Projects in Central Iowa

Topological Insulators

The conducting surface states of a topological insulator can be altered to become insulating by inducing bulk ferromagnetism in the material via elemental doping. The figure shows the effects of Cr-doping on the magnetoconductivity in thin films of the topological insulator CrxBi2-xTe3 for x = 0 (a), x = 0.08 (b), x = 0.10 (c), and x = 0.14 (d). The pure Bi2Te3 film (a) exhibits weak anti-localization arising from the two-dimensional conducting surface states, indicated by the sharp downward cusp in the magnetoconductivity with the application of a small magnetic field. The film with x = 0.14 exhibits weak localization due to the increased disorder in the crystal from the Cr and is indicated by an upward cusp in magnetoconductivity at small magnetic fields (d). As the Cr concentration increases weak anti-localization can be seen to be suppressed due to the formation of a surface energy gap while weak localization becomes more dominant (b and c) due to the increased disorder in the crystal.

Project participants: Nick Meyer, Michelle Yan Ni, Ikenna Nlebedim, David Jiles