52 citations · 129 across the 15 of their papers we have counts for
15 papers
Estimating the Hubbard repulsion sufficient for the onset of nearly-flat-band ferromagnetism
Lukasz Andrzejewski, Janusz Jedrzejewski
We consider nearly-flat-band Hubbard models of a ferromagnet, that is the models that are weak perturbations of those flat-band Hubbard models whose ground state is ferromagnetic f…
How to recognize a nearly-flat-band ferromagnet by means of thermodynamic measurements?
Volodymyr Derzhko, Janusz Jedrzejewski
We make an attempt at unveiling the thermodynamic "signature" of a specific class of electronic systems, the so called nearly-flat-band paramagnets and ferromagnets that can theore…
On the nature of striped phases: Striped phases as a stage of "melting" of 2D crystals
Volodymyr Derzhko, Janusz Jedrzejewski, Taras Krokhmalskii
We discuss striped phases as a state of matter intermediate between two extreme states: a crystalline state and a segregated state. We argue that this state is very sensitive to we…
Exact results for spatial decay of correlations in low-dimensional insulators II
Janusz Jedrzejewski, Taras Krokhmalskii
We study decay rates of one-body reduced density matrices in insulators, described by a tight-binding model, where not only an external potential but also hoppings are spatially mo…
Charge-stripe phases versus a weak anisotropy of nearest-neighbor hopping
V. Derzhko, J. Jedrzejewski
Recently, we demonstrated rigorously the stability of charge-stripe phases in quantum-particle systems that are described by extended Falicov-Kimball Hamiltonians, with the quantum…
Formation of charge-stripe phases in a system of spinless fermions or hardcore bosons
Volodymyr Derzhko, Janusz Jedrzejewski
We consider two strongly correlated two-component quantum systems, consisting of quantum mobile particles and classical immobile particles. The both systems are described by Falico…