1/3/2024 0 Comments Qspace nrg 2011![]() We present a new estimator for the self-energy based on a combination of two equations of motion and discuss its benefits for numerical renormalization group (NRG) calculations. QSpace tensors can deal with any set of abelian symmetries together withĪrbitrary non-abelian symmetries with compact, i.e. Together with simple self-contained numerical procedures to obtainĬlebsch-Gordan coefficients and irreducible operators sets. Introduction to non-abelian symmetries is given for practical applications, These are compared in detail, including their respective dramatic ![]() SU(2)*U(1)*SU(3), and their much larger enveloping symplectic symmetry Includes the more traditional symmetry setting SU(2)^4, the larger symmetry ![]() The same system is analyzed using several alternative symmetry scenarios. Screened spin-3/2 three-channel Anderson impurity model in the presence ofĬonservation of total spin, particle-hole symmetry, and SU(3) channel symmetry. In this paper, the focus is on the application of the General tensor networks such as the multi-scale entanglement renormalizationĪnsatz (MERA). Group (NRG), the density matrix renormalization group (DMRG), or also more Standard renormalization group algorithms such as the numerical renormalization Quantum symmetry spaces, dubbed QSpace, is particularly suitable to deal with Theorem for operators, are accounted for in a natural, well-organized, andĬomputationally straightforward way. The two crucial ingredients, theĬlebsch-Gordan algebra for multiplet spaces as well as the Wigner-Eckart Matrix-product and tensor-network states in the presence of orthonormal localĪs well as effective basis sets. A general framework for non-abelian symmetries is presented for
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