624 research outputs found
Charged complexes at the surface of liquid helium
Charged clusters in liquid helium in an external electric field form a
two-dimensional system below the helium surface. This 2D system undergoes a
phase transition from a liquid to a Wigner crystal at rather high temperatures.
Contrary to the electron Wigner crystal, the Wigner lattice of charged clusters
can be detected directly.Comment: 6 pages, 1 figur
Fast Incomplete Decoherence of Nuclear Spins in Quantum Hall Ferromagnet
A scenario of quantum computing process based on the manipulation of a large
number of nuclear spins in Quantum Hall (QH) ferromagnet is presented. It is
found that vacuum quantum fluctuations in the QH ferromagnetic ground state at
filling factor , associated with the virtual excitations of spin waves,
lead to fast incomplete decoherence of the nuclear spins. A fundamental upper
bound on the length of the computer memory is set by this fluctuation effect
Spin-Peierls transition with strong structural fluctuations in the vanadium oxide VOSbO
We report on the magnetic susceptibility and electron spin resonance
measurements on polycrystalline samples of the vanadium oxide
VOSbO, a quasi-one dimensional S=1/2 Heisenberg system. We show
that the susceptibility vanishes at zero temperature, as in a gapped system,
and we argue that this is due to a spin-Peierls transition with strong
structural fluctuations.Comment: 5 pages, 4 figure
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