6,624 research outputs found
Single molecule DNA sequencing via transverse electronic transport using a graphene nanopore: A tight-binding approach
We report a tight-binding model study of two-terminal graphene nanopore based
device, for sequential determination of DNA bases. Using Greens function
approach we calculate conductance spectra, I-V response and also the changes in
local density of states (LDOS) profile as four different nucleobases inserted
one by one into the pore embedded in the zigzag graphene nanoribbon (ZGNR). We
find distinct features in LDOS profile for different nucleotides and the same
is also present in conductance and I-V response. We propose the actual working
principle of the device, by setting the bias across the pore to a fixed voltage
(this voltage gives maximum discrimination between characteristic current of
the four nucleotides) and translocating the ss-DNA through the nanopore using a
transverse electric field while recording the characteristic current of the
nucleotides. Not only the typical current output is much larger than previous
results, but the seaparation between them for different bases are also
definite. Our investigation provides high accuracy and significant amount of
distinction between different nucleotides.Comment: 6 pages, 5 figure
Two dimensional imaging observations of meter-decameter bursts associated with the February 1986 flare activity
An analysis is presented of the two dimensional imaging observations of a flare observed on 3 Feb. l986 using the Clark Lake Multifrequency Radioheliograph. The flare produced almost all types of Meter-decimeter radio emission: enhanced storm radiation, type III/V bursts, II and IV and flare continuum. The flare continuum had early (FCE) and late (FC II) components and the type II occurred during the period between these two components. Comparing the source positions of type III/V and FCE it was found that these bursts must have occurred along adjacent open and closed field lines, respectively. The positional analysis of type II and FC II implies that the nonthermal electrons responsible for FC II need not be accelerated by type II shock and this conclusion is further supported by the close association of FC II with a microwave peak. Using the positional and temporal analysis of all these bursts and the associated hard X-ray and microwave emissions, a schematic model is developed for the magnetic field configuration in the flaring region in which the nonthermal particles responsible for these bursts are confined or along which they propagate
Yang-Baxter algebra and generation of quantum integrable models
An operator deformed quantum algebra is discovered exploiting the quantum
Yang-Baxter equation with trigonometric R-matrix. This novel Hopf algebra along
with its limit appear to be the most general Yang-Baxter algebra
underlying quantum integrable systems. Three different directions of
application of this algebra in integrable systems depending on different sets
of values of deforming operators are identified. Fixed values on the whole
lattice yield subalgebras linked to standard quantum integrable models, while
the associated Lax operators generate and classify them in an unified way.
Variable values construct a new series of quantum integrable inhomogeneous
models. Fixed but different values at different lattice sites can produce a
novel class of integrable hybrid models including integrable matter-radiation
models and quantum field models with defects, in particular, a new quantum
integrable sine-Gordon model with defect.Comment: 13 pages, revised and bit expanded with additional explanations,
accepted for publication in Theor. Math. Phy
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