EPJ

EPJ WOC - Proceedings
Proceedings

EPJ B Highlight - On-demand conductivity for graphene nanoribbons

Details
Published on 05 November 2014
Sketch of a kicked zigzag graphene nanoribbon. © D. Babajanov et al.

Physicists from Uzbekistan and Germany have devised a theoretical model to tune the conductivity of graphene zigzag nanoribbons using ultra-short pulses

Physicists have, for the first time, explored in detail the time evolution of the conductivity, as well as other quantum-level electron transport characteristics, of a graphene device subjected to periodic ultra-short pulses. To date, the majority of graphene studies have considered the dependency of transport properties on the characteristics of the external pulses, such as field strength, period or frequency. The new findings have now been published in EPJ B by Doniyor Babajanov from the Turin Polytechnic University in Tashkent, Uzbekistan, and colleagues. These results may help to develop graphene-based electronic devices that only become conductors when an external ultra-short pulse is applied, and are otherwise insulators.

The authors’ focus is on the transport in graphene nanoribbons driven by laser pulses, which were chosen for their ability to apply periodic kicks to the system. Babajanov and colleagues relied on driven quantum systems and quantum chaos theories to study transport characteristics within the nanoribbon. For a single kicking period, they obtained the exact solution of a mathematical equation, called the time-dependent Dirac equation. Then, by iterating this solution they were able to numerically and precisely compute the arbitrary characteristics of time-dependent quantum transport of electrons within the material.

They found that applying external driving force leads to enhancement of electronic transitions within what are referred to as valence and conduction bands. This study thus demonstrates that such transitions allow a dramatic increase in conductivity within a short time, making it possible to tune the electronic properties using short external pulses.

The next stage could be extending the test to the case of a time-dependent magnetic field, to strain-induced pseudo-magnetic fields, or to external monochromatic fields. Ultimately, this could lead to useful applications such as ultrafast electronic switches.

D. Babajanov, D.U. Matrasulov and R. Egger (2014), Particle Transport in Graphene Nanoribbon Driven by Ultrashort Pulses, European Physical Journal B, DOI: 10.1140/epjb/e2014-50610-6

All news
Submit a proposal
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)

More testimonials
ISSN: 2100-014X (Electronic Edition)

© EDP Sciences

Conference announcements