2,339 research outputs found
ANALOG-DIGITAL DEVICES FOR PARAMATER ESTIMATION OF THE TRANSFER FUNCTION
In this paper comparatively simple method is presented for identifying linear and
nonlinear dynamic units. It is based on the analysis of steady-state response and makes use of the
sequential integrating procedure. Analog-digital devices needed for realizing this method are
described. It is shown that use of the microprocessor made it possible to continuously contol the
elements in the function control systems
Single-electron latch with granular film charge leakage suppressor
A single-electron latch is a device that can be used as a building block for
Quantum-dot Cellular Automata (QCA) circuits. It consists of three nanoscale
metal "dots" connected in series by tunnel junctions; charging of the dots is
controlled by three electrostatic gates. One very important feature of a
single-electron latch is its ability to store ("latch") information represented
by the location of a single electron within the three dots. To obtain latching,
the undesired leakage of charge during the retention time must be suppressed.
Previously, to achieve this goal, multiple tunnel junctions were used to
connect the three dots. However, this method of charge leakage suppression
requires an additional compensation of the background charges affecting each
parasitic dot in the array of junctions. We report a single-electron latch
where a granular metal film is used to fabricate the middle dot in the latch
which concurrently acts as a charge leakage suppressor. This latch has no
parasitic dots, therefore the background charge compensation procedure is
greatly simplified. We discuss the origins of charge leakage suppression and
possible applications of granular metal dots for various single-electron
circuits.Comment: 21 pages, 4 figure
Interlayer tunneling spectroscopy of graphite at high magnetic field oriented parallel to the layers
Interlayer tunneling in graphite mesa-type structures is studied at a strong
in-plane magnetic field up to 55 T and low temperature K. The
tunneling spectrum vs. has a pronounced peak at a finite voltage
. The peak position increases linearly with . To explain the
experiment, we develop a theoretical model of graphite in the crossed electric
and magnetic fields. When the fields satisfy the resonant condition
, where is the velocity of the two-dimensional Dirac electrons in
graphene, the wave functions delocalize and give rise to the peak in the
tunneling spectrum observed in the experiment.Comment: 6 pages, 6 figures; corresponds to the published version in Eur.
Phys. J. Special Topics, Proceedings of the IMPACT conference 2012,
http://lptms.u-psud.fr/impact2012
Fermionic construction of partition function for multi-matrix models and multi-component TL hierarchy
We use -component fermions to present -fold
integrals as a fermionic expectation value. This yields fermionic
representation for various -matrix models. Links with the -component
KP hierarchy and also with the -component TL hierarchy are discussed. We
show that the set of all (but two) flows of -component TL changes standard
matrix models to new ones.Comment: 16 pages, submitted to a special issue of Theoretical and
Mathematical Physic
Geometric Phantom Categories
In this paper we give a construction of phantom categories, i.e. admissible
triangulated subcategories in bounded derived categories of coherent sheaves on
smooth projective varieties that have trivial Hochschild homology and trivial
Grothendieck group. We also prove that these phantom categories are phantoms in
a stronger sense, namely, they have trivial K-motives and, hence, all their
higher K-groups are trivial too.Comment: LaTeX, 18 page
Fermionic approach to the evaluation of integrals of rational symmetric functions
We use the fermionic construction of two-matrix model partition functions to
evaluate integrals over rational symmetric functions. This approach is
complementary to the one used in the paper ``Integrals of Rational Symmetric
Functions, Two-Matrix Models and Biorthogonal Polynomials'' \cite{paper2},
where these integrals were evaluated by a direct method.Comment: 34 page
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