3,099 research outputs found
Thermopower of Quantum Hall States in Corbino Geometry as a Measure of Quasiparticle Entropy
Using the Onsager relation between electric and heat transport coefficients,
and considering the very different roles played by the quantum Hall condensate
and quasiparticles in transport, we argue that near the center of a quantum
Hall plateau thermopower in a Corbino geometry measures {\it "entropy per
quasiparticle per quasiparticle charge"}. This relation indicates that
thermopower measurement in a Corbino setup is a more direct measure of
quasiparticle entropy than in a Hall bar. Treating disorder within the
self-consistent Born approximation, we show through an explicit microscopic
calculation that this relation holds on an integer quantum Hall plateau at low
temperatures. Applying this to non-Abelian quantum Hall states, we argue that
Corbino thermopower at sufficiently low temperature becomes
temperature-independent, and measures the quantum dimension of non-Abelian
quasiparticles that determines the topological entropy they carry
Transforming ASN.1 Specifications into CafeOBJ to assist with Property Checking
The adoption of algebraic specification/formal method techniques by the
networks' research community is happening slowly but steadily. We work towards
a software environment that can translate a protocol's specification, from
Abstract Syntax Notation One (ASN.1 - a very popular specification language
with many applications), into the powerful algebraic specification language
CafeOBJ. The resulting code can be used to check, validate and falsify critical
properties of systems, at the pre-coding stage of development. In this paper,
we introduce some key elements of ASN.1 and CafeOBJ and sketch some first steps
towards the implementation of such a tool including a case study.Comment: 8 pages, 12 figure
Charge and Spin Reconstruction in Quantum Hall Strips
We study the effect of electron-electron interactions on the charge and spin
structures of a Quantum Hall strip in a triangularly confined potential. We
find that the strip undergoes a spin-unpolarized to spin-polarized transition
as a function of magnetic field perpendicular to the strip. For sharp
confinements the spin-polarization transition is spontaneous and first develops
at the softer side of the triangular potential which shows up as an
"eye-structure" in the electron dispersion. For sufficiently weak confinements
this spin-polarization transition is preceded by a charge reconstruction of a
single spin species, which creates a spin-polarized strip of electrons with a
width of the order of the magnetic length detached from the rest of the system.
Relevance of our findings to the recent momentum resolved tunneling experiments
is also discussed.Comment: 4+ page
Modeling the Turkish Broad Money Demand
This paper analyzes broad money demand in Turkey between 1987 and 2001, a period characterized by a process of financial sector liberalization, implemented using various structural reforms and deregulations. It presents the historical background and the pace of liberalization, accompanied by a discussion on main economic indicators. It gives a brief summary on theory for the analysis of money demand and constructs an error correction model for M2X using quarterly data, where the long run relationship is established using real income, interest rate on deposits, interest rate on government securities, inflation rate and real exchange rate. The results show that, both exchange rate and inflation rate have substantial impact on the Turkish broad money demand.Money Demand, Financial Liberalization, Cointegration, Error-correction Modeling
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