Quantum spin solver near saturation: QS$^3_{~}$
| Autor: | Hiroshi Ueda, Seiji Yunoki, Tokuro Shimokawa |
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| Rok vydání: | 2021 |
| Předmět: |
Quantum Physics
Exact diagonalization Lanczos method Statistical Mechanics (cond-mat.stat-mech) Strongly Correlated Electrons (cond-mat.str-el) Quantum spin system Magnetism General Physics and Astronomy FOS: Physical sciences Dilute hardcore Bose system Computational Physics (physics.comp-ph) Condensed Matter - Strongly Correlated Electrons Dynamical structure factor Hardware and Architecture Condensed Matter::Strongly Correlated Electrons Quantum Physics (quant-ph) Physics - Computational Physics Condensed Matter - Statistical Mechanics |
| DOI: | 10.48550/arxiv.2107.00872 |
| Popis: | We develop a program package named QS$^{3}$ [\textipa{kj\'u:-\'es-kj\'u:b}] based on the (thick-restart) Lanczos method for analyzing spin-1/2 XXZ-type quantum spin models on spatially uniform/non-uniform lattices near fully polarized states, which can be mapped to dilute hardcore Bose systems. All calculations in QS$^{3}$, including eigenvalue problems, expectation values for one/two-point spin operators, and static/dynamical spin structure factors, are performed in the symmetry-adapted bases specified by the number $N_{\downarrow}$ of down spins and the wave number $\boldsymbol{k}$ associated with the translational symmetry without using the bit representation for specifying spin configurations. Because of these treatments, QS$^{3}$ can support large-scale quantum systems containing more than 1000 sites with dilute $N_{\downarrow}$. We show the benchmark results of QS$^{3}$ for the low-energy excitation dispersion of the isotropic Heisenberg model on the $10\times10\times10$ cubic lattice, the static and dynamical spin structure factors of the isotropic Heisenberg model on the $10\times10$ square lattice, and the open-MP parallelization efficiency on the supercomputer (Ohtaka) based on AMD Epyc 7702 installed at the Institute for the Solid State Physics (ISSP). Theoretical backgrounds and the user interface of QS$^{3}$ are also described. Comment: 15 pages, 4 figures, Source codes are available at https://github.com/QS-Cube/ED |
| Databáze: | OpenAIRE |
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