28 research outputs found
Quantum breathing dynamics of ultracold bosons in 1D-harmonic traps: Unraveling the pathway from few- to many-body systems
Following a `bottom-up approach' in understanding many-particle effects and
dynamics we provide a systematic ab initio study of the dependence of the
breathing dynamics of ultracold bosons in a 1D harmonic trap on the number of
bosons ranging from few to many. To this end, we employ the Multi-Layer
Multi-Configuration Time-Dependent Hartree method for Bosons (ML-MCTDHB) which
has been developed very recently [S. Kr\"onke, L. Cao, O. Vendrell and P.
Schmelcher. {\it New J. Phys.} {\bf 15}, 063018 (2013)]. The beating behavior
for two bosons is found numerically and consequently explained by an analytical
approach. Drawing on this, we show how to compute the complete breathing mode
spectrum in this case. We examine how the two-mode breathing behavior of two
bosons evolves to the single-frequency behavior of the many-particle limit when
adding more particles. In the limit of many particles, we numerically study the
dependence of the breathing mode frequency on both the interaction strength as
well as on the particle number. We provide an estimate for the parameter region
in which Gross-Pitaevskii theory is well applicable
Periactin
Poster examines the chemical makeup of Periactin, generic name Cyproheptadine Hydrocholoride. Classified as an antihistamine or antipruritic, the labeled uses for Periactin are for symptomatic relief of various allergic conditions. Periactin can also be used for the following unlabeled uses: Cushing\u27s disease, carcinoid syndrome, vascular headaches, and as an appetite stimulant
Few-boson tunneling dynamics of strongly correlated binary mixtures in a double-well
We explore the tunneling dynamics of strongly correlated bosonic mixtures in
a one-dimensional double-well. The role of the inter- and intra-species
interactions and their interplay is investigated using the numerically exact
Multi-Configuration Time dependent Hartree (MCTDH) method. The dynamics is
studied for three initial configurations: complete and partial population
imbalance and a phase separated state. Increasing the inter-species interaction
leads to a strong increase of the tunneling time period analogous to the
quantum self-trapping for condensates. The intra-species repulsion can suppress
or enhance the tunneling period depending on the strength of the inter-species
correlations as well as the initial configuration. Completely correlated
tunneling between the two species and within the same species as well as
mechanisms of species separation and counterflow are revealed. These effects
are explained by studying the many-body energy spectra as well as the
properties of the contributing stationary states.Comment: Significant changes from the previous version. This version accepted
for publicatio