For phase transitions in dissipative quantum impurity models, the existence of a quantum-to-
classical correspondence has been discussed extensively. We introduce a variational matrix …

The sub-Ohmic spin-boson model possesses a quantum phase transition at zero
temperature between a localized and a delocalized phase, whose properties have so far …

We analyze the static and dynamic properties of two Ising-coupled quantum spins
embedded in a common bosonic bath as an archetype of dissipative quantum mechanics …

We propose a general extended coherent state approach to the qubit (or fermion) and
multimode boson coupling systems. The application to the spin-boson model with the …

The spin-boson model, describing a two-level system coupled to a bath of harmonic
oscillators, is a generic model for quantum dissipation, with manifold applications. It has also …

The application of Wilson's numerical renormalization group (NRG) method to dissipative
quantum impurity models, in particular the sub-Ohmic spin-boson model, has led to …

Quantum phase transitions reflect singular changes taking place in a many-body ground
state; however, computing and analyzing large-scale critical wave functions constitutes a …

We prove an entanglement area law for a class of one-dimensional quantum systems
involving infinite-dimensional local Hilbert spaces. This class of quantum systems includes …

We report exact results for the influence of purely sub-Ohmic dephasing on the dynamics of
a quantum two-level system. From response functions, we determine a crossover coupling …

We address the phenomenon of critical Kondo destruction in pseudogap Bose-Fermi
Anderson and Kondo quantum impurity models. These models describe a localized level …