Establishing a minimal microscopic model for cuprates is a key step towards the elucidation
of a high-T c mechanism. By a quantitative comparison with a recent in situ angle-resolved …

We apply the Lang–Firsov (LF) transformation to electron–boson coupled Hamiltonians and
variationally optimize the transformation parameters and molecular orbital coefficients to …

The density matrix renormalization group (DMRG) has become a powerful numerical
method that can be applied to low-dimensional strongly correlated fermionic and bosonic …

While basic features of polarons were well recognized a long time ago and have been
described in a number of review papers and textbooks, interest in the role of electron …

New carbon-based superconductors are synthesized by intercalating metal atoms into the
solid-phase hydrocarbons picene and coronene. The highest reported superconducting …

We propose a numerical method which embeds the variational non-Gaussian wave-function
approach within exact diagonalization, allowing for efficient treatment of correlated systems …

We review exact numerical results for one-dimensional quantum systems with half-filled
bands. The topics covered include Peierls transitions in Holstein, Fröhlich, Su-Schrieffer …

We study the Holstein-Hubbard model at half filling to explore ordered phases including
superconductivity (SC), antiferromagnetism (AF), and charge order (CO) in situations where …

We study the real-time dynamics of a highly excited charge carrier coupled to quantum
phonons via a Holstein-type electron-phonon coupling. This is a prototypical example for the …

We re-examine the Peierls insulator to Mott insulator transition scenario in the one-
dimensional Holstein-Hubbard model where, at half-filling, electron-phonon and electron …