Towards large-scale restricted active space calculations inspired by the Schmidt decomposition

Autor:	Barcza, Gergely, Werner, Miklós Antal, Zaránd, Gergely, Pershin, Anton, Benedek, Zsolt, Legeza, Örs, Szilvási, Tibor
Rok vydání:	2021
Předmět:	Physics - Chemical Physics Condensed Matter - Strongly Correlated Electrons
Druh dokumentu:	Working Paper
DOI:	10.1021/acs.jpca.2c05952
Popis:	We present an alternative, memory-efficient, Schmidt decomposition-based description of the inherently bipartite restricted active space (RAS) scheme, which can be implemented effortlessly within the density matrix renormalization group (DMRG) method via the dynamically extended active space procedure. Benchmark calculations are compared against state-of-the-art results of C$_2$ and Cr$_2$, which are notorious for their multi-reference character. Our results for ground and excited states together with spectroscopic constants demonstrate that the proposed novel approach, dubbed as DMRG-RAS, which is variational and free of uncontrolled method errors, has the potential to outperfom conventional methods for strongly correlated molecules. Comment: 11 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2111.06665 Zobrazit plný text záznamu View this record from Arxiv