AUTHOR=Schober Giulio A. H. , Ehrlich Jannis , Reckling Timo , Honerkamp Carsten 

TITLE=Truncated-Unity Functional Renormalization Group for Multiband Systems With Spin-Orbit Coupling

JOURNAL=Frontiers in Physics

VOLUME=6

YEAR=2018

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2018.00032

DOI=10.3389/fphy.2018.00032

ISSN=2296-424X

ABSTRACT=<p>Although the functional renormalization group (fRG) is by now a well-established method for investigating correlated electron systems, it is still undergoing significant technical and conceptual improvements. In particular, the motivation to optimally exploit the parallelism of modern computing platforms has recently led to the development of the “truncated-unity” functional renormalization group (TU-fRG). Here, we review this fRG variant, and we provide its extension to multiband systems with spin-orbit coupling. Furthermore, we discuss some aspects of the implementation and outline opportunities and challenges ahead for predicting the ground-state ordering and emergent energy scales for a wide class of quantum materials.</p>