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Using organometallic compounds and an electron beam of high power density, novel nano-granular compound materials were fabricated with nm precision in a slow step deposition process. We investigate the electrical characteristics of the compound-material and found out that the measured resistivity can only be explained as a contact resistivity from the deposited material to the metal contact, which...
Focused Electron Beam Induced Processing allows to generate nanocrystalline materials with metallic conductivity and also nanogranular materials with metal crystals embedded in a fullerene matrix, which shows at room temperature 1000 times better conductivity than superconductors at 40 K due to a Bose Einstein Condensate. Resistors and field emitters carry > 50 MA/cm2 current density and deliver...
We study formation of rotating three-dimensional solitons (azimuthons) in Bose Einstein condensate with attractive nonlocal nonlinear interaction. In particular, we demonstrate formation of toroidal rotating solitons and investigate their stability. The presence of repulsive contact interaction does not prevent the existence of those solutions, but allows to control their rotation.
A novel unitary quantum lattice algorithm is developed to explore quantum turbulence. Because of its low memory requirements and its near perfect parallelization to the full 12,288 cores on the Cray XT5, simulations were run up to spatial grids of 5,7603. The Gross-Pitaevskii equation, which describes the ground state of a Bose Einstein condensate (BEC), is solved and it is found that the incompressible...
This study investigates two- and three-body losses in the vicinity of two Feshbach resonances on the |F=1,mF=0> state. The successful achievement of inelastic processes in ultracold 7Li Bose Einstein condensate near the Feshbach resonances is reported in detail. This investigation reveals that inelastic collisions are very strong in-between the resonances, despite the presence of zero crossing...
For excitons in semiconductors, a gauge structure intrinsic to the wavefunction leads to spin-dependent topological transport. When sufficiently large number of excitons have condensed, a nonrotating Bose-Einstein condensate may become unstable against vortex formation.
We have observed Bose-Einstein condensation of molecules, created from a spin mixture of fermionic 6Li atoms. The condensate realizes the limit of tightly bound fermion pairs in the crossover between BCS and BEC superfluidity
Summary form only given. Since the first observations of Bose Einstein condensates (BEC) in dilute atomic gases, there has been considerable interest in observing effects in atomic BEC akin to the hallmark effects associated with a superfluid, in particular persistent, quantized circulation of the fluid. Using a method proposed by Williams and Holland' we have prepared vortices, macroscopic quantum...
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