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Puzzles of Dark Matter - More Light on Dark Atoms?
Puzzles Dark Matter - More Light Dark Atoms
2011/1/5
Positive results of dark matter searches in experiments DAMA/NaI and DAMA/LIBRA confronted with results of other groups can im-ply nontrivial particle physics solutions for cosmological dark mat-ter.
Hyperfine-mediated static polarizabilities of monovalent atoms and ions
Hyperfine-mediated static polarizabilities monovalent atoms
2010/11/16
We apply relativistic many-body methods to compute static differential polarizabilities for transitions inside the ground-state hyperfine manifolds of monovalent atoms and ions. Knowing this transiti...
Controlling double ionization of atoms in intense bichromatic laser pulses
ionization atoms intense bichromatic laser pulses
2010/11/17
We consider the classical dynamics of a two-electron system subjected to an intense bichromatic linearly polarized laser pulse. By varying the parameters of the field, such as the phase lag and the r...
Ultracold Atoms as a Target: Absolute Scattering Cross-Section Measurements
Ultracold Atoms Target Scattering Cross-Section Measurements
2010/11/12
We report on a new experimental platform for the measurement of absolute scattering cross-sections. The target atoms are trapped in an optical dipole trap and are exposed to an incident particle beam...
AC-Stark shift and photoionization of Rydberg atoms in an optical dipole trap
AC-Stark shift photoionization Rydberg atoms
2010/11/12
We have measured the AC-Stark shift of the $14D_{5/2}$ Rydberg state of rubidium 87 in an optical dipole trap formed by a focussed CO$_2$-laser. We find good quantitative agreement with the model of ...
Vacancy decay in endohedral atoms: the role of non-central position of the atom
endohedral atoms non-central position of the atom
2010/11/16
We demonstrate that the Auger decay rate in an endohedral atom is very sensitive to the atom's location in the fullerene cage. Two additional decay channels appear in an endohedral system: (a) the cha...
Ground state properties of a three-site Bose-Fermi ring with a small number of atoms
three-site Bose-Fermi small number of atoms
2010/11/25
We investigate a three-site ring system with a small number of quantum degenerate bosons and
fermions. By means of the exact diagonalization of the Bose-Fermi-Hubbard Hamiltonian, we show
that the s...
A Moving Magnetic Trap Decelerator: a New Source for Cold Atoms and Molecules
Moving Magnetic Trap Decelerator Source Cold Atoms Molecules
2010/11/12
We present a new source of cold paramagnetic atoms and molecules. The paramagnetic particles are cooled during the adiabatic expansion and become entrained in an intense, cold but fast supersonic bea...
Enhanced stability of hydrogen atoms at the graphene/graphane interface of nanoribbons
Enhanced stability of hydrogen atoms graphene/graphane interface of nanoribbons
2010/11/24
The thermal stability of graphene/graphane nanoribbons (GGNRs) is investigated using density functional theory. It is found that the energy barriers for the diffusion of hydrogen atoms on the zigzag a...
Lamb Shift for static atoms outside a Schwarzschild black hole
Lamb Shift static atoms Schwarzschild black hole
2010/12/21
We study, by separately calculating the contributions of vacuum fluctuations and radiation
reaction to the atomic energy level shift, the Lamb shift of a static two-level atom interacting with real m...
Dark Atoms of the Universe: towards OHe nuclear physics
Dark Atoms Universe OHe nuclear physics
2011/1/10
The nonbaryonic dark matter of the Universe is assumed to consist of new stable particles. A specific case is possible, when new stable particles bear ordinary electric charge and bind in heavy ”atoms...
Rydberg state mediated quantum gates and entanglement of pairs of neutral atoms
Rydberg state mediated quantum gates entanglement pairs of neutral atoms
2010/11/9
Experiments performed within the last year have demonstrated Rydberg state mediated quantum gates and deterministic entanglement between pairs of trapped neutral atoms. These experiments validate ten ...
Tunable one-dimensional microwave emissions from cyclic-transition three-level atoms
Tunable one-dimensional microwave emissions -transition three-level atoms
2010/11/9
By strongly driving a cyclic-transition three-level artificial atom, demonstrated by such as a flux-based superconducting circuit, we show that coherent microwave signals can be excited along a couple...
We report a technique that uses clouds of ultracold atoms as sensitive, tunable, and non-invasive probes for microwave eld imaging with micrometer spatial resolution. The microwave magnetic eld comp...
In recent years, ultracold atoms have emerged as an exceptionally controllable experimental system to investigate fundamental physics, ranging from quantum information science to simulations of conde...