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CAMP: Superconducting Proximity Effects in Topological Materials

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CAMP Seminar by Zhigang Jiang (Georgia Institute of Technology)
10 September 2013 from 3:30 PM to 5:00 PM
339 Davey
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(814) 863-1089
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When topological insulators are in contact with a superconductor, novel proximity effect occurs. Theory predicts that the proximity induced superconducting states are spinless and p -wave like, and Majorana bound states may appear at the edges. In the first part of my talk I will present our recent spectroscopic studies of the proximity effects on the surface of three-dimensional topological insulator Bi 2 Se 3 and in hybrid structures comprising candidate two-dimensional topological insulator InAs/GaSb quantum wells. I will focus on the zero-bias behavior of the interface conductance with respect to temperature, magnetic field, and interfacial barrier strength. Second, I will discuss the investigation of the candidate topological superconductor Cu 0.25 Bi 2 Se 3 using a normal-metal or superconducting ( s -wave) point contact. In this work, we observe a non-monatomic temperature dependence of the zero-bias point- contact conductance, which signifies the unconventional superconductivity of Cu 0.25 Bi 2 Se 3.