We present algorithmic improvements for fast and memory-efficient use of discrete spatial symmetries in Exact Diagonalization computations of quantum many-body systems. These techniques allow us to work flexibly in the reduced basis of symmetry-adapted wave functions. Moreover, a parallelization scheme for the Hamiltonian-vector multiplication in the Lanczos procedure for distributed memory machines avoiding load balancing problems is proposed. We demonstrate that using these methods low-energy properties of systems of up to 50 spin-1/2 particles can be successfully determined.
Direct Extension of Density-Matrix Renormalization Group toward 2-Dimensional Quantum Lattice Systems: Studies for Parallel Algorithm, Accuracy, and Performance
Spectral Mapping Theorem between SU(N) and SU(Ns/N) Heisenberg Models and Exact Diagonalization of SU(4) and SU(7) Long-Range Ordered Phases on the Triangular Lattice
Laboratoire de Physique et Modélisation des Milieux Condensés, Université Grenoble Alpes and CNRS(凝聚态介质物理与建模实验室,格勒诺布尔阿尔卑斯大学及法国国家科学研究中心)
XDiag: Exact Diagonalization for Quantum Many-Body Systems
Max Planck Institute for the Physics of Complex Systems(马克斯·普朗克复杂系统物理研究所);Center for Computational Quantum Physics, Flatiron Institute(计算量子物理中心,西蒙斯基金会平顿研究所);Department of Physics, Massachusetts Institute of Technology(麻省理工学院物理系)