1,355 research outputs found
Waiting time distribution for trains of quantized electron pulses
We consider a sequence of quantized Lorentzian pulses of non-interacting
electrons impinging on a quantum point contact (QPC) and study the waiting time
distribution (WTD), for any transmission and any number of pulses. As the
degree of overlap between the electronic wave functions is tuned, the WTD
reveals how the correlations between particles are modified. In the weak
overlap regime, the WTD is made of several equidistant peaks, separated by the
same period as the incoming pulses, contained in an almost exponentially
decaying envelope. In the other limit, the WTD of a single quantum channel
subjected to a constant voltage is recovered. In both cases, the WTD stresses
the difference between the fluctuations induced by the scatterer and the ones
encoded in the incoming quantum state. A clear cross-over between these two
situations is studied with numerical and analytical calculations based on
scattering theory.Comment: 12 pages, 4 figure
Distributions of electron waiting times in quantum-coherent conductors
The distribution of electron waiting times is useful to characterize quantum
transport in mesoscopic structures. Here we consider a generic quantum-coherent
conductor consisting of a mesoscopic scatterer in a two-terminal setup. We
extend earlier results for single-channel conductors to setups with several
(possibly spin-degenerate) conduction channels and we discuss the effect of a
finite electronic temperature. We present detailed investigations of the
electron waiting times in a quantum point contact as well as in two mesoscopic
interferometers with energy-dependent transmissions: a Fabry-P\'erot
interferometer and a Mach-Zehnder interferometer. We show that the waiting time
distributions allow us to determine characteristic features of the scatterers,
for instance the number of resonant levels in the Fabry-P\'erot interferometer
that contribute to the electronic transport.Comment: 13 pages, 11 figure
Fingerprints of Majorana fermions in current-correlations measurements from a superconducting tunnel microscope
We compute various current correlation functions of electrons flowing from a
topological nanowire to the tip of a superconducting scanning tunnel microscope
and identify fingerprints of a Majorana bound state. In particular, the spin
resolved cross-correlations are shown to display a clear distinction between
the presence of a such an exotic state (negative correlations) and an Andreev
bound state (positive correlations). Similarity and differences with
measurements with a normal tunnel microscope are also discussed, like the
robustness to finite temperature for instance.Comment: 7 pages, 2 figure
A quantum magnetic RC circuit
We propose a setup that is the spin analog of the charge-based quantum RC
circuit. We define and compute the spin capacitance and the spin resistance of
the circuit for both ferromagnetic (FM) and antiferromagnetic (AF) systems. We
find that the antiferromagnetic setup has universal properties, but the
ferromagnetic setup does not. We discuss how to use the proposed setup as a
quantum source of spin excitations, and put forward a possible experimental
realization using ultracold atoms in optical lattices
On the subject matter of international relations
This article deals with the subject matter of International Relations as an academic discipline. It addresses the issue of whether and how one or many realms could legitimately be claimed as the discipline’s prime subject. It first raises a number of problems associated with both identifying the subject matter of IR and ‘labelling’ the discipline in relation to competing terms and disciplines, followed by a discussion on whether, and to what degree, IR takes its identity from a confluence of disciplinary traditions or from a distinct methodology. It then outlines two possibilities that would lead to identifying IR as a discipline defined by a specific realm in distinction to other disciplines: (1) the ‘international’ as a specific realm of the social world, functionally differentiated from other realms; (2) IR as being about everything in the social world above a particular scale. The final section discusses the implications of these views for the study of International Relations
Vital Sign Ontology
We introduce the Vital Sign Ontology (VSO), an extension of the Ontology for General Medical Science (OGMS) that covers the consensus human vital signs: blood pressure, body temperature, respiratory rate, and pulse rate. VSO provides a controlled structured vocabulary for describing vital sign measurement data, the processes of measuring vital signs, and the anatomical entities participating in such measurements.
VSO is implemented in OWL-DL and follows OBO Foundry guidelines and best practices. If properly developed and extended, we believe the VSO will find applications for the EMR, clinical informatics, and medical device communities
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