In the early 1970s, Wilson developed the concept of a fully nonperturbative renormalization
group transformation. When applied to the Kondo problem, this numerical renormalization …

The treatment of high‐dimensional problems such as the Schrödinger equation can be
approached by concepts of tensor product approximation. We present general techniques …

Emergence of exceptional points in two dimensions is one of the remarkable phenomena in
non-Hermitian systems. We here elucidate the impacts of symmetry on the non-Hermitian …

We analyze a two-dimensional Kondo lattice model with special emphasis on non-Hermitian
properties of the single-particle spectrum, following a recent proposal by Kozii and Fu. Our …

The density-matrix renormalization group method (DMRG) has established itself over the
last decade as the leading method for the simulation of the statics and dynamics of one …

We show how spectral functions for quantum impurity models can be calculated very
accurately using a complete set of discarded numerical renormalization group eigenstates …

We present a tree-tensor-network-based method to study strongly correlated systems with
nonlocal interactions in higher dimensions. Although the momentum-space and quantum …

A general framework for non-abelian symmetries is presented for matrix-product and tensor-
network states in the presence of well-defined orthonormal local as well as effective basis …

We study the limits of the energy resolution that can be achieved in the calculations of
spectral functions of quantum impurity models using the numerical renormalization group …

A detailed derivation of the recently proposed time-dependent numerical renormalization-
group (TD-NRG) approach to nonequilibrium dynamics in quantum-impurity systems is …