1,972 research outputs found
The Effect of Interaction on Shot Noise in The Quantum Limit
We employ a non-linear sigma model defined on a Keldysh contour to study the
current and the current noise in a diffusive micro-bridge in the presence of
electron-electron interactions. Out of equilibrium the fluctuation-dissipation
theorem (FDT) does not apply, hence these two quantities are not simply
interrelated. For a two-dimensional electron gas (2DEG) we obtain logarithmic
singularities in the low frequency limit. PACS Nos. 71.10.Ay, 71.23.An,
73.50.TdComment: Submitted to the proceedings of 36 Renconters de Moriond "Electronic
correlations: from meso- to nano-physics". One figure adde
Yang-Lee Edge Singularity on a Class of Treelike Lattices
The density of zeros of the partition function of the Ising model on a class
of treelike lattices is studied. An exact closed-form expression for the
pertinent critical exponents is derived by using a couple of recursion
relations which have a singular behavior near the Yang-Lee edge.Comment: 9 pages AmsTex, 2 eps figures, to appear in J.Phys.
Electronic Mach-Zehnder interferometer as a tool to probe fractional statistics
We study transport through an electronic Mach-Zehnder interferometer recently
devised at the Weizmann Institute. We show that this device can be used to
probe statistics of quasiparticles in the fractional quantum Hall regime. We
calculate the tunneling current through the interferometer as the function of
the Aharonov-Bohm flux, temperature and voltage bias, and demonstrate that its
flux-dependent component is strongly sensitive to the statistics of tunneling
quasiparticles. More specifically, the flux-dependent and flux-independent
contributions to the current are related by a power law, the exponent being a
function of the quasiparticle statistics.Comment: 22 pages; 8 figure
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