Work

Negative differential resistance of viscous electron flow in graphene

Year: 2024

Type: article

Abstract: Negative differential resistance (NDR) devices show a decrease in the voltage drop with increasing current, an advantageous feature for amplifying and oscillating circuits. We introduce a NDR mechanism based on the electron hydrodynamics of two dimensional (2D) materials. An increase of the current in the system favors electron-electron collisions so that a ballistic-hydrodynamic transition takes place and the device resistance is reduced. This phenomenon results in NDR provided that the electron’s mean free path is much longer than the device size. We discuss the strategies towards NDR and find that geometrically engineered devices make it possible to achieve NDR in graphene with ∼ 200 nm sized geometrical features. This NDR mechanism is revealed as a new hydrodynamic signature, particularly relevant in graphene devices for 2D electronics and high-frequency operation.

Source: 2D Materials

DOI: 10.1088/2053-1583/ad8d65

Authors: Jorge Estrada-Álvarez, Elena Díaz, Francisco Domínguez-Adame

Institution: Universidad Complutense de Madrid

Language: English

Topic: Graphene research and applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,800

Funders: Comunidad de Madrid, Agencia Estatal de Investigación