Accurate calculations of strongly correlated materials remain a formidable challenge in condensed matter physics,particularly due to the computational demand of conventional methods.This paper presents an efficient so...Accurate calculations of strongly correlated materials remain a formidable challenge in condensed matter physics,particularly due to the computational demand of conventional methods.This paper presents an efficient solver for dynamical mean field theory using configuration interaction(CI).The method is shown to have improved efficiency compared to traditional,exact diagonalization approaches.Hence,it provides an accessible,open-source alternative that can be executed on standard laptop computers or on supercomputers.The solver is demonstrated on cerium in theγ,αandϵphases.An analysis of how the electronic structure of Ce evolves as function of lattice compression is made.It is argued that the electronic structure evolves from a localized nature of the 4f shell in γ-Ce to an essentially itinerant nature of the 4f shell of ϵ-Ce.The transition between these two phases,as function of compression,can hence be seen as a Mott transition.However,this transition is intercepted by the strongly correlatedα-phase of elemental Ce,for which the 4f shell forms a Kondo singlet.展开更多
基金support from the Wallenberg Initiative Materials Science for Sustainability (WISE) funded by the Knut and Alice Wallenberg Foun- dation (KAW) and the European Research Council through the ERC Synergy Grant 854843-FASTCORRO.E. also acknowledges support from STandUPP, eSSENCE, the Swedish Research Council (VR) and the Knut and Alice Wallenberg Foundation (KAW- Scholar program)NL-ECO: Netherlands Initiative for Energy-Efficient Computing (with project number NWA. 1389.20.140) of the NWA research program.
文摘Accurate calculations of strongly correlated materials remain a formidable challenge in condensed matter physics,particularly due to the computational demand of conventional methods.This paper presents an efficient solver for dynamical mean field theory using configuration interaction(CI).The method is shown to have improved efficiency compared to traditional,exact diagonalization approaches.Hence,it provides an accessible,open-source alternative that can be executed on standard laptop computers or on supercomputers.The solver is demonstrated on cerium in theγ,αandϵphases.An analysis of how the electronic structure of Ce evolves as function of lattice compression is made.It is argued that the electronic structure evolves from a localized nature of the 4f shell in γ-Ce to an essentially itinerant nature of the 4f shell of ϵ-Ce.The transition between these two phases,as function of compression,can hence be seen as a Mott transition.However,this transition is intercepted by the strongly correlatedα-phase of elemental Ce,for which the 4f shell forms a Kondo singlet.
