University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Monday, November 17th 2014
1:00 pm:
CM Journal Club in 210 Tate
Speaker: Ruiqi Xing
Subject: Friedel Oscillation and Kohn-Luttinger effect

Kohn-Luttinger effect is one of the most appealing and elegant effects in condensed matter physics. The idea is simple and still widely used in the study of superconductivity. In 1965, Kohn and Luttinger(KL)[1] proposed a new pairing mechanism of superconductivity. They pointed out that in 3D weakly interacting fermion systems, even in the case of purely repulsive interactions, superconductivity will occur at sufficiently low temperature, if no other orders emerge first. Following [2] and [3], I will first review Friedel oscillations to give you an oversimplified idea about the Kohn-Luttinger(KL) mechanism, and then formulate the criterion of the appearance of superconductivity, and finally show the KL effect.
[1]W. Kohn and J. M. Luttinger,Phys. Rev. Lett. 15, 524(1965)
[2]J. M. Luttinger,Phys. Rev. 150, 202[1966]
[3]Saurabh Maiti,Andrey V. Chubukov,arXiv:1305.4609

The weekly calendar is also available via subscription to the physics-announce mailing list, and by RSS feed.