Volume 130, Number 1, April 2020
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||30 April 2020|
Terahertz plasma wave localization and velocity control in tapered double-layer graphene heterostructure
Kotelnikov Institute of Radio Engineering and Electronics (Saratov Branch), Russian Academy of Sciences Zelenaya, 38, Saratov 410019, Russia
Received: 28 February 2020
Accepted: 18 April 2020
Terahertz plasma wave (plasmon) localization and velocity control in tapered heterostructure (taper) with double-layer graphene were numerically studied. We employ a simple rigorous theoretical model to find out the plasmon localization length and energy velocity values along the tapered structure. It is shown that the plasmon decelerates while moving from the taper apex and the deceleration process is accompanied with increase of the plasmon wave localization. While moving along the structure from the taper apex, the plasmon energy velocity as well as the plasmon localization length can become nearly an order of magnitude smaller as compared to the values near the taper apex.
PACS: 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) / 41.20.Jb – Electromagnetic wave propagation; radiowave propagation / 68.65.Pq – Graphene films
© EPLA, 2020
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