Details

Autor(en) / Beteiligte

• Zgid, Dominika
• Gull, Emanuel

Titel

Finite temperature quantum embedding theories for correlated systems

Ist Teil von

• New journal of physics, 2017-02, Vol.19 (2), p.23047

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2017

Quelle

Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals

Beschreibungen/Notizen

• The cost of the exact solution of the many-electron problem is believed to be exponential in the number of degrees of freedom, necessitating approximations that are controlled and accurate but numerically tractable. In this paper, we show that one of these approximations, the self-energy embedding theory (SEET), is derivable from a universal functional and therefore implicitly satisfies conservation laws and thermodynamic consistency. We also show how other approximations, such as the dynamical mean field theory and its combinations with many-body perturbation theory, can be understood as a special case of SEET and discuss how the additional freedom present in SEET can be used to obtain systematic convergence of results.