[RpL 1263] Re: Научный семинар

[Anna Kardakova]

Уважаемые коллеги,

Хочу сообщить, что научный семинар завтра отменяется, о дате переноса 
сообщу попозже.


С уважением,

Анна Кардакова


02.10.2020 10:58, Anna Kardakova пишет:
>
> Уважаемые коллеги,
>
>
> На следующей неделе 6 октября (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
>
> Р.S. Надеюсь эпидемиологическая ситуация позволит провести семинар.
>