[institut] Reminder: SCL Seminar: Jaksa Vucicevic, Wednesday, 21 December, 11:30

[Darko Tanaskovic]

Dear colleagues,

You are cordially invited to the SCL seminar of the Center for the Study 
of Complex Systems, which will be held on Wednesday, 21 December 2016 at 
11:30 in the library reading room “Dr. Dragan Popović" of the Institute 
of Physics Belgrade. The talk entitled

Beyond DMFT - capturing low temperature physics of the cuprates

will be given by Dr. Jaksa Vučičević (IPhT, CEA Saclay, France; 
Scientific Computing Laboratory, Center for the Study of Complex 
Systems, Institute of Physics Belgrade).

Abstract of the talk:

High-T_c cuprate superconductors exhibit puzzling behavior at low 
temperature, eluding full theoretical understanding for 30 years. The 
main challenge lies in proper treatment of non-local correlations which 
give rise to d-wave pairing and the normal-phase pseudogap. The 2D 
Hubbard model on a square lattice is widely considered to be the right 
starting point for the description of the cuprates, but its 
(numerically) exact solutions are very few, and are obtained at an 
immense computational cost. In the first part of the talk, we will 
present an overview of the ongoing efforts to identify the minimal 
method to properly solve the Hubbard model at low temperature. The 
recently developed TRILEX and nested-cluster DMFT show the most promise 
in direct comparison to the large-scale DCA calculations. In the second 
part of the talk, we will employ TRILEX and its simplifications EDMFT+GW 
and GW for exploratory work, uncover a strong link between the 
prominence of collective spin-fluctuations and height of the 
superconducting T_c, and show how both strongly depend on the details of 
the bare electronic dispersion.


Best regards,
Darko Tanasković