1,460 research outputs found
Conductance Fluctuations Near the Two-Dimensional Metal-Insulator Transition
Measurements of conductance on short, wide, high-mobility Si-MOSFETs
reveal both a two-dimensional metal-insulator transition (MIT) at moderate
temperatures (1 4~K) and mesoscopic fluctuations of the conductance at
low temperatures ( 1~K). Both were studied as a function of chemical
potential (carrier concentration ) controlled by gate voltage () and
magnetic field near the MIT. Fourier analysis of the low temperature
fluctuations reveals several fluctuation scales in that vary
non-monotonically near the MIT. At higher temperatures, is similar
to large FETs and exhibits a MIT. All of the observations support the
suggestion that the MIT is driven by Coulomb interactions among the carriers.Comment: 4 pages, LaTeX, physica.sty (slightly modified prabib.sty), Submitted
to the 1997 Conference on Electronic Properties of Two-Dimensional System
Stark broadening data for spectral lines of rare-earth elements: Nb III
The electron-impact widths for 15 doubly charged Nb ion lines have been
theoretically determined by using the modified semiempirical method. Using the
obtained results, we considered the influence of the electron-impact mechanism
on line shapes in spectra of chemically peculiar stars and white dwarfs.Comment: 10 pages, 2 figures, 1 table, accepted in Advances in Space Researc
Crystallite Size and Lattice Distortion Determination of Graphite
A graphite sample was prepared by heating chemically purified petroleum
coke powder to 30oo 0c in an argon atmosphere and its structural
-characteristics were determined by various X-ray diffraction methods1-s. The validity of the values obtained for the crystallite size and the lattice distortion proportion is discussed
Unit Cell Dimensions Measurement of Less Perfectly Crystallized Artificial Graphite
The precise unit cell dimension measurement of the reactor graphite
is difficult because of a small number of the X-ray diffraction lines. One can
use only the small angle reflections (100), (110), (002), and (004)
Mesoscopic Behavior Near a Two-Dimensional Metal-Insulator Transition
We study conductance fluctuations in a two-dimensional electron gas as a
function of chemical potential (or gate voltage) from the strongly insulating
to the metallic regime. Power spectra of the fluctuations decay with two
distinct exponents (1/v_l and 1/v_h). For conductivity , we find a third exponent (1/v_i) in the shortest samples, and
non-monotonic dependence of v_i and v_l on \sigma. We study the dependence of
v_i, v_l, v_h, and the variances of corresponding fluctuations on \sigma,
sample size, and temperature. The anomalies near
indicate that the dielectric response and screening length are critically
behaved, i.e. that Coulomb correlations dominate the physics.Comment: Revised according to referee remark
Photo-centric variability of quasars caused by variations in their inner structure: Consequences on Gaia measurements
We study the photocenter position variability due to variations in the quasar
inner structure. We consider variability in the accretion disk emissivity and
torus structure variability due to different illumination by the central
source. We discuss possible detection of these effects by Gaia. Observations of
the photocenter variability in two AGNs, SDSS J121855+020002 and SDSS
J162011+1724327 have been reported and discussed. With investigation of the
variations in the quasar inner structure we explore how much this effect can
affect the position determination and whether it can be (or not) detected with
Gaia mission. We used (a) a model of a relativistic disk, including the
perturbation that can increase brightness of a part of the disk, and
consequently offset the photocenter position, and (b) a model of a dusty torus
which absorbs and re-emits the incoming radiation from accretion disk. We
estimated the value of the photocenter offset due to these two effects. We
found that perturbations in the inner structure can significantly offset the
photocenter. It depends on the characteristics of perturbation and accretion
disk and structure of the torus. In the case of two considered QSOs the
observed photocenter offsets cannot be explained by variations in the accretion
disk and other effects should be considered. We discussed possibility of
exploding stars very close to the AGN source, and also possibility that there
are two variable sources in the center of these two AGNs that may indicate a
binary super-massive black hole system on a kpc (pc) scale. The Gaia mission
seems to be very perspective, not only for astrometry, but also for exploring
the inner structure of AGNs. We conclude that variations in the quasar inner
structure can affect the observed photocenter (up to several mas). There is a
chance to observe such effect in the case of bright and low-redshifted QSOs.Comment: 12 pages, 8 figures, 3 tables. Accepted for publication in Astronomy
and Astrophysics. Language improved, typos correcte
Stark broadening of B IV lines for astrophysical and laboratory plasma research
Stark broadening parameters for 36 multiplets of B IV have been calculated
using the semi-classical perturbation formalism. Obtained results have been
used to investigate the regularities within spectral series and temperature
dependence.Comment: 8 pages, 6 figures, 1 table, in press in Advances in Space Researc
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