[RpL 1064] Re: Семинар ПРФЛ во вторник, 26-го декабря, в 17-00

[Georgy Fedorov]

Аннотация доклада
Recent Advances in Graphene and 2D Materials
Denis Bandurin
School of Physics and Astronomy, The University of Manchester, UK
Over the years, graphene has enabled the observation of many ground-breaking phenomena. Among the most spectacular are massless Dirac fermions, Klein tunneling, Hofstadter butterflies, valley polarized topological currents and so on. These discoveries became possible because of graphene’s unique electronic system that offers an ultra-clean playground to study different regimes of electron transport.
In the first part of my talk, we will discuss one of such novel regimes. We will talk about the hydrodynamic flow of electron liquid in graphene. I will show that electrons in graphene can behave as a very viscous fluid (more viscous than honey) forming vortices of applied electron current1, shown in the right figure. We will discuss the approaches that can be used to measure the viscosity of electron liquid in high-quality graphene devices2. Furthermore, I will show how this novel transport regime can be used in the development of sensitive terahertz detectors3.
Although the discovery of graphene has promised new technological breakthroughs and novel ultra-fast devices, the absence of the band gap hinders the development of practical electronic devices. That is why there has been an intensive search for new 2D materials which on the one hand would share similar properties with graphene (such as high mobility of electrons, atomic thickness, stability under ambient conditions and so on) and on the other hand would represent a semiconductor family meaning that they would possess a finite band gap.
In the second part of my talk, we will discuss the electronic and optical properties of a novel atomically thin semiconductor - indium selenide4. To access the unique properties of InSe we fabricated high-quality InSe field effect transistors that demonstrated the room-temperature mobility of more than 2000 cm2/Vs higher than that of silicon. Thanks to such a high quality we observed quantum oscillations and fully developed quantum Hall effect. We will discuss how this unique electronic system hosted by InSe can offer a new playground for low-dimensional physics and ultra-thin electronic devices.
1 D.A. Bandurin, A. Principi, G.H. Auton, E. Khestanova, K.S. Novoselov, I. V Grigorieva, L.A. Ponomarenko, A.K. Geim, and M. Polini, Science 351, 1055 (2016).
2 R.K. Kumar, D.A. Bandurin, F.M.D. Pellegrino, Y. Cao, A. Principi, H. Guo, G.H. Auton, M. Ben Shalom, L.A. Ponomarenko, G. Falkovich, I. V. Grigorieva, L.S. Levitov, M. Polini, and A.K. Geim, Nat. Phys. in press (2017).
3 D.A. Bandurin, I. Gayduchenko, Y. Cao, M. Moskotin, G. Goltsman, G. Fedorov, and D. Svintsov, Unpublished (2017).
4 D.A. Bandurin, A. V. Tyurnina, G.L. Yu, and A. Mishchenko, Nat. Nanotech. 12, 223–227 (2017).

>Среда, 20 декабря 2017, 17:08 +03:00 от Georgy Fedorov via hi-all <hi-all на lists.rplab.ru>:
>
>Уважаемые коллеги,
>В ближайший вторник, 26-го декабря, состоится семинар ПРФЛ.
>Докладчик Бандурин Денис Александрович,  School of Physics and Astronomy, The University of Manchester, UK
>Представит доклад  "Recent Advances in Graphene and 2D Materials"
>Подробная информация в приложении.
>С уважением
>Георгий
>
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