[RpL 1270] Re: Научный семинар

[Anna Kardakova]

Добрый день, коллеги.

Напоминаю про научный семинар, который состоится сегодня в 17:00.


Для тех кто захочет присоединиться онлайн, прикрепляю ссылку на Zoom 
трансляцию:

Join Zoom Meeting
https://us02web.zoom.us/j/88255139046?pwd=V3N4V2hrbHNjQ0VCbitkYnpKVkdHZz09

Meeting ID: 882 5513 9046
Passcode: 082771


С уважением,

Анна Кардакова


28.10.2020 12:52, Anna Kardakova пишет:
>
> Уважаемые коллеги,
>
>
> На следующей неделе *3 ноября (вторник) в 17:00* состоится научный 
> семинар. Докладчик - Игорь Гайдученко.
>
> Планируется презентация и обсуждение статьи*Tunnel field-effect 
> transistors for sensitive terahertz detection *(подана в Nature 
> Communications).
>
> *Abstract: *The rectification of high-frequency electromagnetic waves 
> to direct currents is a crucial process for energy harvesting, beyond 
> 5G wireless communications, ultra-fast science, and observational 
> astronomy. As the radiation frequency is raised to the sub-terahertz 
> (THz) domain, efficient ac-to-dc conversion by conventional 
> electronics becomes increasingly challenging and requires alternative 
> rectification protocols. Here we address this challenge by tunnel 
> field-effect transistors made of dual-gated bilayer graphene (BLG). 
> Taking advantage of BLG's electrically tunable band structure, we 
> create a lateral tunnel junction and couple it to a broadband antenna 
> exposed to THz radiation. The incoming radiation is then 
> down-converted by strongly non-linear interband tunneling mechanisms, 
> resulting in exceptionally high-responsivity (exceeding 3~kV/W) and 
> low-noise (0.2 pW/$\sqrt{\mathrm{Hz}}$) detection at cryogenic 
> temperatures. We demonstrate how the switching from intraband Ohmic to 
> interband tunneling regime within a single detector can raise its 
> responsivity by one order of magnitude, in agreement with the 
> developed theory. Our work demonstrates an unexpected application of 
> interband tunnel transistors for high-frequency detection and reveals 
> bilayer graphene as one of the most promising platforms therefor.
>
>
> Приглашаются все желающие.
>
> С уважением,
> Анна Кардакова