Add to ORKGWe discuss the finite-temperature phase diagram in three-dimensional Bose–Hubbard model relevant for the Bose–Einstein condensates in optical lattices, by employing U(1) quantum rotor approach and the topologically constrained path integral, that includes a summation over U(1) topological charge. The effective action formalism allows us to formulate a problem in the phase only action and obtain analytical formulae for the critical lines beyond mean-field theory. PACS numbers: 05.30.Jp, 03.75.Lm, 03.75.Nt, 67.40.Kh 1
In this thesis we study quantum degenerate Bose gases at finite temperatures in optical and magnetic...
Quantum technologies offer the prospect to efficiently simulate sign-problem afflicted regimes in la...
3We discuss the finite-temperature properties of Bose-Einstein condensates loaded on a 2D optical la...
Based on the classification scheme of phase transitions, we study the phase transitions fo...
We present the novel approach to the Bose-Hubbard model using the U(1) quantum rotor description. We...
We use the finite-size, density-matrix-renormalization-group(DMRG) method to obtain the zero-tempera...
Abstract – We derive the equation of state of a two-dimensional Bose gas in an optical lattice in th...
The phase transitions in the Bose-Hubbard model are investigated. A single-particle Green's function...
We propose a two-step procedure to study the order of phase transitions at finite temperature in ele...
Kajantie K, Karjalainen M, Laine M, Peisa J. Three-dimensional U(1) gauge plus Higgs-theory as an ef...
We study a two-species bosonic Hubbard model on a two-dimensional square lattice by means of quantum...
We study the three-dimensional bosonic t-J model, i.e., the t-J model of "bosonic electrons," at fin...
Abstract. We use the finite-size, density-matrix-renormalization-group (DMRG) method to obtain the z...
We show the emergence of a third Goldstone mode in binary condensates at the phase-separation in qua...
We examine the zero and finite temperature phase diagram of the extended Bose-Hubbard model on a squ...
In this thesis we study quantum degenerate Bose gases at finite temperatures in optical and magnetic...
Quantum technologies offer the prospect to efficiently simulate sign-problem afflicted regimes in la...
3We discuss the finite-temperature properties of Bose-Einstein condensates loaded on a 2D optical la...
Based on the classification scheme of phase transitions, we study the phase transitions fo...
We present the novel approach to the Bose-Hubbard model using the U(1) quantum rotor description. We...
We use the finite-size, density-matrix-renormalization-group(DMRG) method to obtain the zero-tempera...
Abstract – We derive the equation of state of a two-dimensional Bose gas in an optical lattice in th...
The phase transitions in the Bose-Hubbard model are investigated. A single-particle Green's function...
We propose a two-step procedure to study the order of phase transitions at finite temperature in ele...
Kajantie K, Karjalainen M, Laine M, Peisa J. Three-dimensional U(1) gauge plus Higgs-theory as an ef...
We study a two-species bosonic Hubbard model on a two-dimensional square lattice by means of quantum...
We study the three-dimensional bosonic t-J model, i.e., the t-J model of "bosonic electrons," at fin...
Abstract. We use the finite-size, density-matrix-renormalization-group (DMRG) method to obtain the z...
We show the emergence of a third Goldstone mode in binary condensates at the phase-separation in qua...
We examine the zero and finite temperature phase diagram of the extended Bose-Hubbard model on a squ...
In this thesis we study quantum degenerate Bose gases at finite temperatures in optical and magnetic...
Quantum technologies offer the prospect to efficiently simulate sign-problem afflicted regimes in la...
3We discuss the finite-temperature properties of Bose-Einstein condensates loaded on a 2D optical la...