An adaptive algorithm for n-body field expansions
Weinberg, Martin D.
1998-05-28
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12 records were found.
Comment: Available at http://www-spht.cea.fr/articles/s06/034
Comment: Available at http://www-spht.cea.fr/articles/s06/033
Comment: Manuscript (5 pages, 3 figures) and supplementary material (8 pages,
9 figures); v2 includes additional supplementary material and references; to
be published in Phys. Rev. Lett
Comment: Accepted for publication in Physical Review Letters
Comment: 13 pages including supplementary information, Nature Physics in print
Comment: To be published in PRL, 10 pages including supplementary material
The chiral edge channels in the quantum Hall regime are considered ideal
ballistic quantum channels, and have quantum information processing
potentialities. Here, we demonstrate experimentally, at filling factor 2, the
efficient tuning of the energy relaxation that limits quantum coherence and
permits the return toward equilibrium. Energy relaxation along an edge channel
is controllably enhanced by increasing its transmission toward a floating ohmic
contact, in quantitative agreement with predictions. Moreover, by forming a
closed inner edge channel loop, we freeze energy exchanges in the outer
channel. This result also elucidates the inelastic mechanisms at work at
filling factor 2, informing us in particular that those within the outer edge
channel are negligible.
Comment: 11 pages including supplementary information, to be published in
Nature Physics
We present an experiment where the quantum coherence in the edge states of
the integer quantum Hall regime is tuned with a decoupling gate. The coherence
length is determined by measuring the visibility of quantum interferences in a
Mach-Zehnder interferometer as a function of temperature, in the quantum Hall
regime at filling factor two. The temperature dependence of the coherence
length can be varied by a factor of two. The strengthening of the phase
coherence at finite temperature is shown to arise from a reduction of the
coupling between co-propagating edge states. This opens the way for a strong
improvement of the phase coherence of Quantum Hall systems. The decoupling gate
also allows us to investigate how inter-edge state coupling influence the
quantum interferences' dependence on the injection bias. We find that the
finite bi...
We report on a search for low-energy (E < 20 keV) WIMP-induced nuclear recoils using data collected in 2009 - 2010 by EDELWEISS from four germanium detectors equipped with thermal sensors and an electrode design (ID) which allows to efficiently reject several sources of background. Using an exposure of 113 kg.d, we find no evidence for an exponential distribution of low-energy nuclear recoils that could be attributed to WIMP elastic scattering. For WIMPs of mass 10 GeV, the observation of one event in the WIMP search region results in a 90% CL limit of 1.0 \times 10^-5 pb on the spin-independent WIMP-nucleon scattering cross-section, which constrains the parameter space associated with the findings reported by the CoGeNT, DAMA and CRESST experiments.
