Aspects of Ising-nematic quantum critical point

Speaker: 
Ipsita Mandal
Event Date and Time: 
Wed, 2016-05-25 14:00 - 15:00
Location: 
henn 304
Local Contact: 
Marcel Franz
Intended Audience: 
Graduate
We devise a renormalization group analysis for quantum field theories with Fermi surface to study scaling behaviour of non-Fermi liquid states in a controlled approximation. The non-Fermi liquid fixed points are identified from a Fermi surface in (m+1) spatial dimensions, while the co-dimension of Fermi surface is also extended to a generic value. We also study superconducting instability in such systems as a function of dimension and co-dimension of the Fermi surface. The key point in this whole analysis is that unlike in relativistic QFT, the Fermi momentum $k_F$ enters as a dimensionful parameter, thus modifying the naive scaling arguments. The effective coupling constants are found to be combinations of the original coupling constants and $k_F$.
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