54 citations · 63 across the 3 of their papers we have counts for
5 papers
Superfluid to Mott-insulator transition in an anizotropic two--dimensional optical lattice
T. P. Polak, T. K. Kopec
We study the superfluid to Mott-insulator transition of bosons in an optical anizotropic lattice by employing the Bose-Hubbard model living on a two-dimensional lattice with anizot…
Resonance phenomena in asymmetric superconducting quantum interference devices
T. P. Polak, E. Sarnelli
Theory of self induced resonances in asymmetric two-junction interferometer device is presented. In real devices it is impossible to have an ideal interferometer free of imperfecti…
Quantum rotor description of the Mott-insulator transition in the Bose-Hubbard model
T. P. Polak, T. K. Kopeć
We present the novel approach to the Bose-Hubbard model using the quantum rotor description. The effective action formalism allows us to formulate a problem in the…
Local dissipation effects in two-dimensional quantum Josephson junction arrays with magnetic field
T. P. Polak, T. K. Kopec
We study the quantum phase transitions in two-dimensional arrays of Josephson-couples junctions with short range Josephson couplings (given by the Josephson energy) and the chargin…
Ground state properties of charge and magnetically frustrated two--dimensional quantum Josephson--junction arrays
T. K. Kopec, T. P. Polak
We study a quantum Hamiltonian that models an two--dimensional array of Josephson junctions with short range Josephson couplings, (given by the Josephson energy E_J and charging en…