An adaptive algorithm for n-body field expansions
Weinberg, Martin D.
1998-05-28
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26 records were found.
Comment: 4 pages, 4 figures, accepted for publication in Physical Review
Letters
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: ~4 pages, 4 figures
Comment: 6 pages, 3 figures
A two dimensional electron system without spatial inversion symmetry develops
a sample specific dc voltage when exposed to a microwave radiation at low
temperature. We investigate this photovoltaic (PV) effect, in the case where
spatial symmetry is broken by an evanescent high-frequency potential. We
measure the induced PV voltage in a ${\rm GaAs/Ga_{1-x}Al_{x}As}$ Hall bar at
magnetic fields in the Tesla range. We find that in this regime the induced PV
voltage is anti-symmetric with magnetic field, and exhibits regular
Shubnikov-de Haas like oscillations. Our experimental results can be understood
from a simple model, which describes the effect of stationary orbital currents
caused by microwave driving.
Comment: 13 pages including supplementary information, Nature Physics in print
Comment: Published in the Physical Review B
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.
