937 research outputs found
High level language for measurement complex control based on the computer E-100I
A high level language was designed to control the process of conducting an experiment using the computer "Elektrinika-1001". Program examples are given to control the measuring and actuating devices. The procedure of including these programs in the suggested high level language is described
Linking of the mini-computer Electronik-100I and NR-9821A
The means of transmitting digital information from the computer E-100I to the desk top calculator NR-9821A with the help of an intermediate carrier of information (perforated tape) is described. The means of removal of information from the computer E-100I in a form which is understandable for the NR-9821A are given. Instructions for the use and programming of the transcription of information onto magnetic tape from the perforated tape and from the keyboard of the calculator are included
Modified top quark condensation model with the extra heavy fermion, the GeV Pseudo - Goldstone boson, and the additional heavy scalar bosons
We discuss the modified top quark condensation model proposed in
\cite{VZ2015}. This construction was inspired by the top - seesaw scenario, in
which the extra heavy fermion is added that may be paired with the top
quark. Besides, this model incorporates the ideas of the Little Higgs scenario,
in which the GeV scalar particle appears as a Pseudo - Goldstone boson.
This model admits (in addition to the GeV scalar boson ) the heavier
scalar excitation . We consider the region of parameters, where its
mass is TeV, the width of is
, while the mass of the heavy fermion
is TeV. We find that in this model the value of the cross -
section for
TeV is essentially smaller than the present experimental upper bound. Besides,
we find, that for the chosen values of parameters there should exist the CP -
even scalar boson with mass and very small width. In
addition, the model predicts the existence of the extra neutral CP even scalar
boson and the charged scalar boson with masses of the order of TeV.Comment: Latex, 20 page
Anomalous transport phenomena and momentum space topology
Using the derivative expansion applied to the Wigner transform of the two -
point Green function this is possible to derive the response of various
nondissipative currents to the external gauge fields. The corresponding
currents are proportional to the momentum space topological invariants. This
allows to analyse systematically various anomalous transport phenomena
including the anomalous quantum Hall effect and the chiral separation effect.
We discuss the application of this methodology both to the solid state physics
and to the high energy physics.Comment: Latex, 8 pages, proceedings of the XXth International Seminar
"Quarks-2018" (27 May 2018 - 2 June 2018, Valday, Russia
Tunable temperature induced magnetization jump in a GdVO3 single crystal
We report a novel feature of the temperature induced magnetization jump
observed along the a-axis of the GdVO3 single crystal at temperature TM = 0.8
K. Below TM, the compound shows no coercivity and remanent magnetization
indicating a homogenous antiferromagnetic structure. However, we will
demonstrate that the magnetic state below TM is indeed history dependent and it
shows up in different jumps in the magnetization only when warming the sample
through TM. Such a magnetic memory effect is highly unusual and suggesting
different domain arrangements in the supposedly homogenous antiferromagnetic
phase of the compound.Comment: 17 pages, 8 Figure
Screened hybrid functional applied to 3d^0-->3d^8 transition-metal perovskites LaMO3 (M=Sc-Cu): influence of the exchange mixing parameter on the structural, electronic and magnetic properties
We assess the performance of the Heyd-Scuseria-Ernzerhof (HSE) screened
hybrid density functional scheme applied to the perovskite family LaMO3
(M=Sc-Cu) and discuss the role of the mixing parameter alpha (which determines
the fraction of exact Hartree-Fock exchange included in the density functional
theory (DFT) exchange-correlation functional) on the structural, electronic,
and magnetic properties. The physical complexity of this class of compounds,
manifested by the largely varying electronic characters
(band/Mott-Hubbard/charge-transfer insulators and metals), magnetic orderings,
structural distortions (cooperative Jahn-Teller like instabilities), as well as
by the strong competition between localization/delocalization effects
associated with the gradual filling of the t_2g and e_g orbitals, symbolize a
critical and challenging case for theory. Our results indicates that HSE is
able to provide a consistent picture of the complex physical scenario
encountered across the LaMO3 series and significantly improve the standard DFT
description. The only exceptions are the correlated paramagnetic metals LaNiO3
and LaCuO3, which are found to be treated better within DFT. By fitting the
ground state properties with respect to alpha we have constructed a set of
'optimum' values of alpha from LaScO3 to LaCuO3: it is found that the 'optimum'
mixing parameter decreases with increasing filling of the d manifold (LaScO3:
0.25; LaTiO3 & LaVO3: 0.10-0.15; LaCrO3, LaMnO3, and LaFeO3: 0.15; LaCoO3:
0.05; LaNiO3 & LaCuO3: 0). This trend can be nicely correlated with the
modulation of the screening and dielectric properties across the LaMO3 series,
thus providing a physical justification to the empirical fitting procedure.Comment: 32 pages, 29 figure
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