9,698 research outputs found
On transport in quantum Hall systems with constrictions
Motivated by recent experimental findings, we study transport in a simple
phenomenological model of a quantum Hall edge system with a gate-voltage
controlled constriction lowering the local filling factor. The current
backscattered from the constriction is seen to arise from the matching of the
properties of the edge-current excitations in the constriction () and
bulk () regions. We develop a hydrodynamic theory for bosonic edge
modes inspired by this model, finding that a competition between two tunneling
process, related by a quasiparticle-quasihole symmetry, determines the fate of
the low-bias transmission conductance. In this way, we find satisfactory
explanations for many recent puzzling experimental results.Comment: 4 pages, 4 figure
Neutrino Mass Matrices with Two Vanishing Elements/Cofactors
We study the phenomenological implications of the recent neutrino data for
class B of two texture zeros and two vanishing cofactors for Majorana neutrinos
in the flavor basis. We find that classes () of two texture zeros
and classes () of two vanishing cofactors have similar predictions
for neutrino oscillation parameters for the same mass hierarchy. Similar
predictions for classes () of two texture zeros and classes
() of two vanishing cofactors are expected. However, a preference for
a shift in the quadrant of the Dirac-type CP violating phase() in
contrast to the earlier analysis has been predicted for a relatively large
value of the reactor neutrino mixing angle() for class B of two
texture zeros and two vanishing cofactors for an inverted mass spectrum. No
such shift in the quadrant of has been found for the normal mass
spectrum.Comment: 15 pages, 10 figures and 3 table
Copper(I)-Phosphinite Complexes in Click Cycloadditions: Three-Component Reactions and Preparation of 5-Iodotriazoles
© 2016 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.The remarkable activity displayed by copper(I)–phosphinite complexes of general formula [CuBr(L)] in two challenging cycloadditions is reported: a) the one-pot azidonation/cycloaddition of boronic acids, NaN3, and terminal alkynes; b) the cycloaddition of azides and iodoalkynes. These air-stable catalysts led to very good results in both cases and the expected triazoles could be isolated in pure form under ‘Click-suitable’ conditions
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