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Search for Broken Time Reversal Symmetry States in Unconventional Superconductors

Speaker: Aharon Kapitulnik, Stanford University
Date & Time: December 4, 2007 - 1:30pm
Location: Serin E385


Search for Broken Time Reversal Symmetry States in Unconventional Superconductors
Physics and Astronomy


Aharon Kapitulnik, Stanford University
1:30, Serin E385

The Polar Kerr Effect (PKE) is sensitive to time-reversal symmetry breaking (TRSB) since it measures the existence of an antisymmetric contribution to the real and imaginary parts of the frequency-dependent dielectric sensor, and such a contribution is necessarily absent if TRS is not broken in the material. In order to measure the very small static TRSB effect in superconductors, we have developed a new PKE technique based on a fiber Sagnac interferometer with a zero-area Sagnac loop. Initially the technique has been used to discover TRSB in Sr2RuO4, thus strongly suggesting a p+ip symmetry for its order parameter. In the talk I will describe the technique and the detailed studies on Sr2RuO4 as well as subsequent studies of high-Tc superconductors and selected heavy fermion materials. In particular I will show PKE results on high quality YBa2Cu3O6+x shedding new light on the origin of the pseudogap in this system.

Advancing Nanotechnology - IAMDN New Microscopes

 

Rutgers new scanning transmission electron microscope and new helium ion microscope help researchers develop nanotechnology used to fight cancer, generate power, and create more powerful electronics. Watch the video to learn more.

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