Intersite electron correlations on inhomogeneous lattices: A real-space dual fermion approach

Nayuta Takemori, Akihisa Koga, Hartmut Hafermann

Research output: Contribution to journalArticlepeer-review

Abstract

We develop a real-space extension of the dual fermion approach. This method is formulated in terms of real-space Green's functions and local vertex functions, which enables us to discuss local and nonlocal correlations in inhomogeneous systems with an arbitrary geometric structure. We first demonstrate that the approach gives us reasonable results for a homogenous periodic system by taking into account onsite and nearest-neighbor intersite correlations. Moreover, we study the halffilled Hubbard model on the quasiperiodic Penrose lattice and clarify the role of intersite correlations for the Mott transition. The intersite correlations lead to a rich structure in local observables which is inherited from the quasiperiodic structure of the lattice.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - Jan 8 2018

ASJC Scopus subject areas

  • General

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