Maciej M. Maska

Thermodynamics of the two-dimensional Falicov-Kimball model: A classical Monte Carlo study

The two-dimensional Falicov-Kimball (FK) model is analyzed using the Monte Carlo method. In the case of concentrations of both itinerant and localized particles equal to 0.5 we determine temperature dependence of specific heat, charge density wave susceptibility, and density-density correlation function. In the weak interaction regime we find a first order transition to the ordered state and anomalous temperature dependence of the correlation function. We construct the phase diagram of half-filled FK model. Also, the role of next-nearest-neighbor hopping on the phase diagram is analyzed. Lastly, we discuss the density of states and the spectral functions for the mobile particles in weak and strong interaction regime.

Critical field in a superconductivity model with local pairs

We analyze the role of Zeeman and orbital pair breaking mechanisms in models appropriate for short coherence length superconductors. In particular, we investigate the attractive Hubbard and the pair hoping models. The orbital pair breaking mechanism dominates in the majority of models with

Interplay between impurities and correlations in superconducting nanorings

s

UPPER CRITICAL FIELD FOR ELECTRONS IN A TWO-DIMENSIONAL LATTICE

--wave and

Vortex structure in the d-density-wave scenario

d

Hofstadter butterfly for a finite correlated system

--wave superconducting order parameters. On the other, the repulsive pair hopping interaction leads to

Friedel Oscillations In Nanowires At Finite Bias Voltage

\eta

Persistent currents in disordered rings

--type pairing, that is stable against the orbital pair breaking. External magnetic field reduces this type of pairing predominantly due to the Zeeman coupling. According to the recent experiments this mechanism is responsible for closing of the pseudogap. Moreover, the temperature dependence of the gap closing field in

Majorana modes in interacting systems identified by searching for local integrals of motion

\eta

Charge dynamics in doped cuprates

--phase fits the experimental data very well. We discuss whether the preformed pairs in the