53 citations · 230 across the 11 of their papers we have counts for
11 papers
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…
Cooperative spontaneous emission via renormalization approach: Classical versus semi-classical effects
Carlos Eduardo Máximo, Romain Bachelard, Francisco Ednilson Alves dos Santos +1
We address the many-atom emission of a dilute cloud of two-level atoms through a renormalized perturbation theory. An analytical solution for the truncated coupled-dipole equations…
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…
Effective Action Approach for Quantum Phase Transitions in Bosonic Lattices
Barry Bradlyn, Francisco Ednilson A. dos Santos, Axel Pelster
Based on standard field-theoretic considerations, we develop an effective action approach for investigating quantum phase transitions in lattice Bose systems at arbitrary temperatu…