53 citations · 230 across the 11 of their papers we have counts for
9 papers · 1 filter
Green's function approach to the Bose-Hubbard model with disorder
Renan da Silva Souza, Axel Pelster, Francisco E. A. dos Santos
We analyse the distinction between the three different ground states presented by a system of spinless bosons with short-range interactions submitted to a random potential using th…
Entropy of a Turbulent Bose-Einstein Condensate
Lucas Madeira, Arnol D. García-Orozco, F. E. A. dos Santos +1
Quantum turbulence deals with the phenomenon of turbulence in quantum fluids, such as superfluid helium and trapped Bose-Einstein condensates (BECs). Although much progress has bee…
Quantum turbulence in Bose-Einstein condensates: present status and new challenges ahead
L. Madeira, A. Cidrim, M. Hemmerling +3
The field of quantum turbulence is related to the manifestation of turbulence in quantum fluids, such as liquid helium and ultracold gases. The concept of turbulence in quantum sys…
Bose-Einstein Condensation on Curved Manifolds
Natália S. Móller, F. Ednilson A. dos Santos, Vanderlei S. Bagnato +1
Here we describe a weakly interacting Bose gas on a curved manifold, which is embedded in the three-dimensional Euclidean space.~To this end we start by considering a harmonic trap…
Quantum turbulence in quantum gases
L. Madeira, M. A. Caracanhas, F. E. A. dos Santos +1
Turbulence is characterized by a large number of degrees of freedom, distributed over several length scales, that result into a disordered state of a fluid. The field of quantum tu…
Improving Mean-Field Theory for Bosons in Optical Lattices via Degenerate Perturbation Theory
M. Kübler, F. T. Sant'Ana, F. E. A. dos Santos +1
The objective of this paper is the theoretical description of the Mott-insulator to superfluid quantum phase transition of a Bose gas in an optical lattice. In former works the Ray…
Free expansion of Bose-Einstein condensates with a multicharged vortex
Rafael Poliseli Teles, F. E. A. dos Santos, M. A. Caracanhas +1
In this work, we analyze the free expansion of Bose-Einstein condensates containing multicharged vortices. The atomic cloud is initially confined in a three-dimensional asymmetric…
Excitation Spectra of Bosons in Optical Lattices from Schwinger-Keldysh Calculation
T. D. Grass, F. E. A. dos Santos, A. Pelster
Within the Schwinger-Keldysh formalism we derive a Ginzburg-Landau theory for the Bose-Hubbard model which describes the real-time dynamics of the complex order parameter field. An…
Real-Time Ginzburg-Landau Theory for Bosons in Optical Lattices
T. D. Grass, F. E. A. dos Santos, A. Pelster
Within the Schwinger-Keldysh formalism we derive a Ginzburg-Landau theory for the Bose-Hubbard model which describes the real-time dynamics of the complex order parameter field. An…