7 research outputs found
Kondo effect in an integer-spin quantum dot
The Kondo effect is a key many-body phenomenon in condensed matter physics.
It concerns the interaction between a localised spin and free electrons.
Discovered in metals containing small amounts of magnetic impurities, it is now
a fundamental mechanism in a wide class of correlated electron systems. Control
over single, localised spins has become relevant also in fabricated structures
due to the rapid developments in nano-electronics. Experiments have already
demonstrated artificial realisations of isolated magnetic impurities at
metallic surfaces, nanometer-scale magnets, controlled transitions between
two-electron singlet and triplet states, and a tunable Kondo effect in
semiconductor quantum dots. Here, we report an unexpected Kondo effect realised
in a few-electron quantum dot containing singlet and triplet spin states whose
energy difference can be tuned with a magnetic field. This effect occurs for an
even number of electrons at the degeneracy between singlet and triplet states.
The characteristic energy scale is found to be much larger than for the
ordinary spin-1/2 case.Comment: 12 page
Observation of Rydberg blockade between two atoms
We demonstrate experimentally that a single Rb atom excited to the
level blocks the subsequent excitation of a second atom located
more than away. The observed probability of double excitation of
is consistent with a theoretical model based on calculations of the
long range dipole-dipole interaction between atoms.Comment: 4 figure
Recepční pulty
The theoretical part deals with the reception desks in terms of their history, typology and functional possibilities. The market research part is devoted to the description of lighting, colours, dimensions and materials used in reception desks. The design of reception desk is the subject of the practical part and is based on the results of the theoretical part
Proximal Probe Induced Chemical Processing for Nanodevice Elaboration
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