Dynamical vertex approximation in its parquet implementation

Autor(en)

A. Valli, T. Schaefer, P. Thunstroem, G. Rohringer, S. Andergassen, G. Sangiovanni, K. Held, A. Toschi

Abstrakt

We have implemented the dynamical vertex approximation (DΓA) in its full parquet-based version to include spatial correlations on all length scales and in all scattering channels. The algorithm is applied to study the electronic self-energies and the spectral properties of finite-size one-dimensional Hubbard models with periodic boundary conditions (nanoscopic Hubbard rings). From a methodological point of view, our calculations and their comparison to the results obtained within dynamical mean-field theory, plain parquet approximation, and the exact numerical solution allow us to evaluate the performance of the DΓA algorithm in the most challenging situation of low dimensions. From a physical perspective, our results unveil how nonlocal correlations affect the spectral properties of nanoscopic systems of various sizes in different regimes of interaction strength.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Technische Universität Wien, Julius-Maximilians-Universität Würzburg, Eberhard Karls Universität Tübingen

Journal

Physical Review B

Band

91

Anzahl der Seiten

13

ISSN

1098-0121

DOI

https://doi.org/10.1103/PhysRevB.91.115115

Publikationsdatum

03-2015

Peer-reviewed

Ja

ÖFOS 2012

103036 Theoretische Physik, 103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/d35119b7-1eb8-4200-a862-b100f4062f2a