2,858 research outputs found
Effects of Caffeine on Maximum Bench Press Repetitions
The purpose of this research is to study the effects of caffeine on the maximum amount bench press repetitions performed. Blood pressure and heart rate will also be measured. This research is important because of the popular use of caffeine among college athletes in today\u27s society and proving or disproving the benefits could be of great importance to athletes at our university
P-wave Cooper pair splitting
Splitting of Cooper pairs has recently been realized experimentally for
s-wave Cooper pairs. A split Cooper pair represents an entangled two-electron
pair state which has possible application in on-chip quantum computation.
Likewise the spin-activity of interfaces in nanoscale tunnel junctions has been
investigated theoretically and experimentally in recent years. However, the
possible implications of spin-active interfaces in Cooper pair splitters so far
have not been investigated. We analyse the current and the cross correlation of
currents in a superconductor ferromagnet beamsplitter including spin-active
scattering. Using the Hamiltonian formalism we calculate the cumulant
generating function of charge transfer. As a first step, we discuss
characteristics of the conductance for crossed Andreev reflection in
superconductor ferromagnet beamsplitters with s-wave and p-wave superconductors
and no spin-active scattering. In a second step, we consider spin-active
scattering and show how to realize p-wave splitting only using a s-wave
superconductor via the process of spin-flipped crossed Andreev reflection. We
present results for the conductance and cross correlations. Spin-activity of
interfaces in Cooper pair splitters allows for new features in ordinary s-wave
Cooper pair splitters, that can otherwise only be realised by using p-wave
superconductors. In particular it provides access to Bell states different from
the typical spin singlet state.Comment: 7 pages, 2 figures, accepted by Beilstein Journal of Nanotechnology,
references correcte
Charge transfer statistics and entanglement in normal-quantum dot-superconductor hybrid structures
We analyze the full counting statistics (FCS) of a single-site quantum dot
coupled to multiple metallic electrodes in the normal state and a
superconductor for arbitrary transmission. We present an analytical solution of
the problem taking into account the full energy dependence of the transmission
coefficient. We identify two transport processes as sources of entanglement
between the current carriers by observing positive cross current correlations.
Furthermore, we consider ferromagnetic electrodes and show how they can be used
as detectors in experiments violating the Bell-Clauser-Horne-Shimony-Holt
inequality.Comment: 6 pages, 3 figures, typos fixed, references adde
Full counting statistics of interacting quantum dots contacted by a normal metal and a superconductor
We investigate the effects of Coulomb interaction on charge transfer through
a quantum dot attached to a normal and a superconducting lead. While for
voltages much larger than the gap we recover the usual result for normal
conductors, for voltages much smaller than the gap superconducting correlations
lead to a drastically different behavior. Especially, the usual charge doubling
in the normal case is reflected in the occurence of quartets due to the onsite
interaction.Comment: 6 pages, 3 figures, accepted by EP
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Entanglement witnessing in superconducting beamsplitters
We analyse a large class of superconducting beamsplitters for which the Bell
parameter (CHSH violation) is a simple function of the spin detector
efficiency. For these superconducting beamsplitters all necessary information
to compute the Bell parameter can be obtained in Y-junction setups for the
beamsplitter. Using the Bell parameter as an entanglement witness, we propose
an experiment which allows to verify the presence of entanglement in Cooper
pair splitters.Comment: 5 pages, 2 figures, accepted for publication in EP
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