3 papers
cond-mat.supr-con2010
On a possibility of effective electron attraction without "a glue"
Valentin Voroshilov
With the means of Schrodinger equation a two electron problem is considered. It is shown that electrons in a periodic potential might experience effective attraction without any me…
cond-mat.str-el2009
On the existence of Cooper pairs in the Hubbard Model
Valentin Voroshilov
By means of a new canonical transformation for the one-band Hubbard model at half filling we show the existence of Cooper pairs formed by strongly interacting quasiparticles.
cond-mat.other2008
A simple model for describing a lattice with a double occupancy
Valentin Voroshilov
A simple model is presented to investigate an impact of the double occupied sites on the ground state energy of a lattice. The model is seen as a useful tool to introduce undergrad…