SCL семинар: Јакша Вућичевић, 21. децембар 2016.

 

Позивамо Вас на SCL семинар Центра за изучавање комплексних система у среду 21. децембра у 11:30 у читаоници библиотеке "др Драган Поповић" Института за физику.

Предавање под називом:

 

Beyond DMFT - capturing low temperature physics of the cuprates

 

одржаће др Јакша Вућичевић (IPhT, CEA Saclay, France; Лабораторија за примену рачунара у науци, Центар за изучавање комплексних система, Институт за физику у Београду).

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.