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476 results on '"Polyak, B."'

1. What can we learn from nonequilibrium response of a strange metal?

Author

Polyak, B. A., Khrapai, V. S., and Tikhonov, E. S.

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We critically address the recent experiment [Science 382, 907 (2023)] on nonequilibrium transport and noise in a strange metal YbRh2Si2 patterned into the nanowire shape. In the long device, resistivity, differential resistance and current noise data seem to be consistent allowing us to extract electron-phonon coupling and the temperature dependence of electron-phonon scattering length. The obtained values can be reconciled with the experimental data for the short device only assuming the significant contact resistance. We discuss its possible origin as due to the current redistribution between YbRh2Si2 and its gold covering, and reveal that this redistribution contact resistance should be proportional to the YbRh2Si2 resistivity. We also discuss some subtleties of the noise measurements. Overall, neglecting electron-phonon energy relaxation even in the shortest devices is arguable so that the observed shot noise suppression can hardly be attributed to the failure of quasiparticle concept., Comment: 6 pages + 3 pages Supplemental Material

Published
2024
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5. Peak Effects in Stable Linear Difference Equations

Author

Polyak, B. T., Shcherbakov, P. S., and Smirnov, G.

Subjects
Computer Science - Systems and Control
Abstract

We consider asymptotically stable scalar difference equations with unit-norm initial conditions. First, it is shown that the solution may happen to deviate far away from the equilibrium point at finite time instants prior to converging to zero. Second, for a number of root distributions and initial conditions, exact values of deviations or lower bounds are provided. Several specific difference equations known from the literature are also analyzed and estimates of deviations are proposed. Third, we consider difference equations with non-random noise (i.e., bounded-noise autoregression) and provide upper bounds on the solutions. Possible generalizations, e.g., to the vector case are discussed and directions for future research are outlined., Comment: Submitted to Journal of Difference Equations and Applications (version 2)

Published
2018

29. Open Problems

Author

Ackermann, J., Barmish, B. R., Dasgupta, S., Fu, M., Hollot, C., Ikeda, M., Kiendl, H., Michalske, A., Mansour, M., Mori, T., Petersen, I. R., Dahleh, M., Polyak, B. T., Qiu, L., Davison, E. J., Mansour, M., editor, Balemi, S., editor, and Truöl, W., editor

Published
1992
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