21 research outputs found
Fractional Quantum Hall Effect in Suspended Graphene: Transport Coefficients and Electron Interaction Strength
Strongly correlated electron liquids which occur in quantizing magnetic
fields reveal a cornucopia of fascinating quantum phenomena such as
fractionally charged quasiparticles, anyonic statistics, topological order, and
many others. Probing these effects in GaAs-based systems, where electron
interactions are relatively weak, requires sub-kelvin temperatures and
record-high electron mobilities, rendering some of the most interesting states
too fragile and difficult to access. This prompted a quest for new
high-mobility systems with stronger electron interactions. Recently,
fractional-quantized Hall effect was observed in suspended graphene (SG), a
free-standing monolayer of carbon, where it was found to persist up to T=10 K.
The best results in those experiments were obtained on micron-size flakes, on
which only two-terminal transport measurements could be performed. Here we pose
and solve the problem of extracting transport coefficients of a fractional
quantum Hall state from the two-terminal conductance. We develop a method,
based on the conformal invariance of two-dimensional magnetotransport, and
illustrate its use by analyzing the measurements on SG. From the temperature
dependence of longitudinal conductivity, extracted from the measured
two-terminal conductance, we estimate the energy gap of quasiparticle
excitations in the fractional-quantized nu=1/3 state. The gap is found to be
significantly larger than in GaAs-based structures, signaling much stronger
electron interactions in suspended graphene. Our approach provides a new tool
for the studies of quantum transport in suspended graphene and other nanoscale
systems
Nonlinear tsunami generation mechanism
International audienceThe nonlinear mechanism of long gravitational surface water wave generation by high-frequency bottom oscillations in a water layer of constant depth is investigated analytically. The connection between the surface wave amplitude and the parameters of bottom oscillations and source length is investigated
Techniques for assessing the investment attractiveness of a commercial organization based on classical methods of strategic economic analysis
Purpose: The development of methodological support for assessing the investment attractiveness of a commercial organization, considering modern information requests of stakeholders. Design/Methodology/Approach: As part of the research, the authors have developed an algorithm for investment attractiveness assessment of a commercial organization by using the scenario method of economic analysis. Findings: It is proved that the main disadvantages of the existing methods of assessing investment attractiveness are: the lack of strategic orientation of the assessment; ignoring the influence of most external and internal factors of activity; the inability to assess the risk of investing in the analyzed object; the need to compare with the level of investment attractiveness of similar organizations for an objective interpretation of the results. Practical implications: To eliminate the significant shortcomings of modern methodological support in this area, the authors recommend the use of scenario method of strategic economic analysis in the process of assessing the investment attractiveness of the organization. Originality/Value: The scenario method of strategic economic analysis proposed by the authors complements the existing approaches with the ability to take into account potential risks when making a far-sighted decision to invest in an organization by combining the results of retrospective analysis and forecasting changes in the quantitative and qualitative characteristics of financial and economic activity.peer-reviewe
Integer and Fractional Quantum Hall Effect in Two-Terminal Measurements on Suspended Graphene
We report the observation of the quantized Hall effect in suspended graphene
probed with a two-terminal lead geometry. The failure of earlier Hall-bar
measurements is discussed and attributed to the placement of voltage probes in
mesoscopic samples. New quantized states are found at integer Landau level
fillings outside the sequence 2,6,10.., as well as at a fractional filling
\nu=1/3. Their presence is revealed by plateaus in the two-terminal conductance
which appear in magnetic fields as low as 2 Tesla at low temperatures and
persist up to 20 Kelvin in 12 Tesla. The excitation gaps, extracted from the
data with the help of a theoretical model, are found to be significantly larger
than in GaAs based electron systems.Comment: 17 pages, 4 figure
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Harmonisation and diagnostics of MIPAS ESA CH4 and N2O profiles using data assimilation
This paper discusses assimilation experiments of methane (CH4) and nitrous oxide (N2O) profiles retrieved from the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS). Here we focus on data versions 6 and 7 provided by the ESA processor. These data sets have been assimilated by the Belgian Assimilation System for Chemical ObsErvations (BASCOE). The CH4 and N2O retrieved profiles can oscillate, especially in the tropical lower stratosphere. Using the averaging kernels of the observations and a background error covariance matrix, which has previously been calibrated, allows the system to partly remedy this issue and provide assimilated fields that are more regular vertically. In general, there is a good agreement between the BASCOE analyses and independent observations from ACE–FTS (CH4 and N2O) and MLS (N2O), demonstrating the general good quality of CH4 and N2O retrievals provided by MIPAS ESA. Nevertheless, this study also identifies two issues in these data sets. First, time series of the observations show unexpected discontinuities due to an abrupt change in the gain of MIPAS band B, generally occurring after the instrument decontamination. Since the calibration is performed weekly, the abrupt change in the gain affects the measurements until the subsequent calibration is performed. Second, the correlations between BASCOE analyses and independent observations are poor in the lower stratosphere, especially in the tropics, probably due to the presence of outliers in the assimilated data. In this region, we recommend using MIPAS CH4 and N2O retrievals with caution
EnKF and 4D-Var data assimilation with chemical transport model BASCOE (version 05.06)
We compare two optimized chemical data assimilation systems, one based on the
ensemble Kalman filter (EnKF) and the other based on four-dimensional
variational (4D-Var) data assimilation, using a comprehensive stratospheric
chemistry transport model (CTM). This work is an extension of the Belgian
Assimilation System for Chemical ObsErvations (BASCOE), initially designed to
work with a 4D-Var data assimilation. A strict comparison of both methods in
the case of chemical tracer transport was done in a previous study and
indicated that both methods provide essentially similar results. In the
present work, we assimilate observations of ozone, HCl, HNO<sub>3</sub>, H<sub>2</sub>O and
N<sub>2</sub>O from EOS Aura-MLS data into the BASCOE CTM with a full description of
stratospheric chemistry. Two new issues related to the use of the full
chemistry model with EnKF are taken into account. One issue is a large number
of error variance parameters that need to be optimized. We estimate an
observation error variance parameter as a function of pressure level for each
observed species using the Desroziers method. For comparison purposes, we
apply the same estimate procedure in the 4D-Var data assimilation, where both
scale factors of the background and observation error covariance matrices are
estimated using the Desroziers method. However, in EnKF the background error
covariance is modelled using the full chemistry model and a model error term
which is tuned using an adjustable parameter. We found that it is adequate to
have the same value of this parameter based on the chemical tracer
formulation that is applied for all observed species. This is an indication
that the main source of model error in chemical transport model is due to the
transport. The second issue in EnKF with comprehensive atmospheric chemistry
models is the noise in the cross-covariance between species that occurs when
species are weakly chemically related at the same location. These errors need
to be filtered out in addition to a localization based on distance. The
performance of two data assimilation methods was assessed through an 8-month
long assimilation of limb sounding observations from EOS Aura MLS. This paper
discusses the differences in results and their relation to stratospheric
chemical processes. Generally speaking, EnKF and 4D-Var provide results of
comparable quality but differ substantially in the presence of model error or
observation biases. If the erroneous chemical modelling is associated with
moderately fast chemical processes, but whose lifetimes are longer than the
model time step, then EnKF performs better, while 4D-Var develops spurious
increments in the chemically related species. If, however, the observation
biases are significant, then 4D-Var is more robust and is able to reject
erroneous observations while EnKF does not
Correcting surface winds by assimilating High-Frequency Radar surface currents in the German Bight
Surface winds are crucial for accurately modeling the surface circulation in the coastal ocean. In the present work, high-frequency (HF) radar surface currents are assimilated using an ensemble scheme which aims to obtain improved surface winds taking into account ECMWF (European Centre for Medium-Range Weather Forecasts) winds as a first guess and surface current measurements. The objective of this study is to show that wind forcing can be improved using an approach similar to parameter estimation in ensemble data assimilation. Like variational assimilation schemes, the method provides an improved wind field based on surface current measurements. However, the technique does not require an adjoint and it is thus easier to implement. In addition, it does not rely on a linearization of the model dynamics. The method is validated directly by comparing the analyzed wind speed to independent in situ measurements and indirectly by assessing the impact of the corrected winds on model sea surface temperature (SST) relative to satellite SST.European COastal-shelf sea OPerational observing and forecasting system (ECOOP