177 research outputs found
Signatures of Parafermion Zero Modes in Fractional Quantum Hall-Superconductor Heterostructures
Parafermion zero modes can arise in hybrid structures composed of
fractional quantum Hall edges proximitized with an s-wave superconductor. Here
we consider parafermion and Cooper pair tunneling, and backscattering in a
junction formed in such hybrid structures. We find that the
periodicity due to parafermion-only tunneling reduces, in the presence of
backscattering, to -periodic at zero temperature and -periodic at
finite temperature unless the fermion parity is fixed. Nevertheless, a clear
signature of parafermion tunneling remains in the shape of the current-phase
relation.Comment: 6 pages, 4 figure
Three Dimensional Superconductivity in FeSe with Tczero Up to 10.9 K Induced by Internal Strain
Polycrystalline sample FeSe was synthesized by a self-flux solution method
which shows a zero resistance temperature up to 10.9 K and a Tconset (90%
\rhon, \rhon: normal state resistivity) up to 13.3 K. The decrease of
superconducting transition temperature by heat treatment indicates that
internal crystallographic strain which plays the same effect as external
pressure is the origin of its high Tc. The fluctuation conductivity was studied
which could be well described by 3D Aslamazov-Larkin (AL) power law. The
estimated value of coherence length \xic=9.2 \AA is larger than the distance
between conducting layers (~6.0 \AA), indicating the three-dimensional nature
of superconductivity in this compound.Comment: 5 figure
Systems mapping: how to improve the genetic mapping of complex traits through design principles of biological systems
<p>Abstract</p> <p>Background</p> <p>Every phenotypic trait can be viewed as a "system" in which a group of interconnected components function synergistically to yield a unified whole. Once a system's components and their interactions have been delineated according to biological principles, we can manipulate and engineer functionally relevant components to produce a desirable system phenotype.</p> <p>Results</p> <p>We describe a conceptual framework for mapping quantitative trait loci (QTLs) that control complex traits by treating trait formation as a dynamic system. This framework, called systems mapping, incorporates a system of differential equations that quantifies how alterations of different components lead to the global change of trait development and function through genes, and provides a quantitative and testable platform for assessing the interplay between gene action and development. We applied systems mapping to analyze biomass growth data in a mapping population of soybeans and identified specific loci that are responsible for the dynamics of biomass partitioning to leaves, stem, and roots.</p> <p>Conclusions</p> <p>We show that systems mapping implemented by design principles of biological systems is quite versatile for deciphering the genetic machineries for size-shape, structural-functional, sink-source and pleiotropic relationships underlying plant physiology and development. Systems mapping should enable geneticists to shed light on the genetic complexity of any biological system in plants and other organisms and predict its physiological and pathological states.</p
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