arXiv subjects

O. S. Ayvazyan

Publications and source records attributed to O. S. Ayvazyan.

2 recordsLinked to original sources

arXiv2010

Magnetic field induced non-Gaussian fluctuations in macroscopic equilibrium systems

We calculate the magnetic-field dependent nonlinear conductance and noise in a macroscopic inhomogeneous system. If the system does not possess a specific symmetry, the magnetic field induces a nonzero third cumulant of the current even at equilibrium. This cumulant is related to the first and second voltage derivatives of the spectral density and average current in the same way as for mesoscopic quantum-coherent systems. The system provides a robust test of a non-equilibrium fluctuation relation.

cond-mat.mes-hall↗

arXiv2008

Effects of Electron-Electron Scattering in Wide Ballistic Microcontacts

We calculate the corrections to the Sharvin conductance of ballistic multimode microcontacts that result from electron--electron scattering in the leads. Using a semiclassical Boltzmann equation, we obtain that these corrections are {\it positive} and scale with temperature as $T^2\ln(E_F/T)$ for three-dimensional contacts and as $T$ for two-dimensional ones. These results are relevant to recent experiments on 2DEG contacts.

cond-mat.mes-hall↗