EPJ B Highlight - When noise gets electrons moving

Realisations of harmonic noise. © D. V. Makarov et al.

A new study demonstrates the existence of a counter-intuitive current, induced by the sound-based equivalent of a laser, with applications in novel microscopic semiconductor devices

Studying the motion of electrons in a disordered environment is no simple task, mainly because given the effect occurring at the scale of interest—referred to as quantum scale—these electrons are otherwise impossible to examine, due to the presence of incidental phenomena. Often, understanding such effects requires a quantum simulator designed to expose them in a different physical setup. This is precisely the approach adopted by Denis Makarov and Leonid Kon’kov from the Victor I. Il’ichev Pacific Oceanological Institute in Vladivostok in a new study published in EPJ B. They relied on a simulator of electronic motion subjected to noise stemming from a flux of sound waves. These findings could lead to semi-conductor devices of a new kind, operated through acoustic radiations.

This simulator is based on a theoretical model consisting of a disordered optical lattice—which was chosen to emulate the forces governing electronic charge transport that may be irregularly distributed in space. The lattice is then exposed to an additional optical lattice that is fluctuating and moving. This is a way of simulating sound waves generated by SASER, the sound-based analogue of a laser.

Through numerical simulation, the authors found that noise fluctuations lead to counter-intuitive electron transport behaviour and a change of direction in atomic transport. They deducted that being exposed to sound wave fluctuation gives rise to an electronic current that spontaneously changes its direction.

They elucidated this phenomenon using a theoretical model describing the evolution of atoms in what is referred to as momentum space. Specifically, they showed that the irregularity of the optical lattice plays only a minor role in the onset of such electronic current reversals. This suggests that the same effect can be observed in a regular optical lattice, with regularly spatially-distributed forces governing charge transport.

D. V. Makarov and L. E. Kon’kov (2014), Quantum transport in a driven disordered potential: onset of directed current and noise-induced current reversal, European Physical Journal B, DOI: 10.1140/epjb/e2014-50568-3

This was our first experience of publishing with EPJ Web of Conferences. We contacted the publisher in the middle of September, just one month prior to the Conference, but everything went through smoothly. We have had published MNPS Proceedings with different publishers in the past, and would like to tell that the EPJ Web of Conferences team was probably the best, very quick, helpful and interactive. Typically, we were getting responses from EPJ Web of Conferences team within less than an hour and have had help at every production stage.
We are very thankful to Solange Guenot, Web of Conferences Publishing Editor, and Isabelle Houlbert, Web of Conferences Production Editor, for their support. These ladies are top-level professionals, who made a great contribution to the success of this issue. We are fully satisfied with the publication of the Conference Proceedings and are looking forward to further cooperation. The publication was very fast, easy and of high quality. My colleagues and I strongly recommend EPJ Web of Conferences to anyone, who is interested in quick high-quality publication of conference proceedings.

On behalf of the Organizing and Program Committees and Editorial Team of MNPS-2019, Dr. Alexey B. Nadykto, Moscow State Technological University “STANKIN”, Moscow, Russia. EPJ Web of Conferences vol. 224 (2019)

ISSN: 2100-014X (Electronic Edition)

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