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Event Detail Information

Event Detail Information

Condensed Matter Seminar: Seeing and controlling the surface states of a topological insulator with ultrafast lasers

Speaker

Prof David Hsieh -
Dept of Physics Mathematics and Astronomy - California Institute of Technology

Date Mar 15, 2013
Time 1:00 pm  
Location

190 Engineering Sciences Bldg - corner Goodwin & Springfield

 

Sponsor Physics
Contact Peggy Pennell
Phone 217/244-7636
Event type CM Seminar
Views 1738
Originating Calendar Physics - Condensed Matter Seminar

The topological insulator is a new electronic phase of matter that exhibits quantum-Hall-like properties even in the absence of a magnetic field. They are realized in strongly spin-orbit coupled band insulators and support surface states that behave like massless helical Dirac fermions. In this talk I will describe results from three different ultrafast laser-based techniques that we used to study the interaction between the topological electronic states of Bi2Se3 and light. These include time-of-flight spin- and angle-resolved photoemission spectroscopy, photo-induced electrical transport and time-resolved optical second harmonic generation. I will discuss how these techniques can be used to visualize detailed spin textures in topological insulators and to excite spin-polarized currents for potential spintronics applications.