Bias voltage regulation-based design method of Weel semimetal material device

Abstract

The invention discloses a design method of a Weel semimetal material device based on bias regulation and control. According to the invention, the correlation between the photoelectric property and the bias voltage of the Weel semimetal material is disclosed, the energy band diagram, the state density diagram and the photocurrent of the Weel semimetal material are calculated through the first principle, and the relationship between the photoelectric property and the electron energy band transition of the Weel semimetal material device is indirectly explained; the photocurrent of the device under different bias voltages is visually displayed, and a theoretical basis is laid for bias voltage regulation and control means in the related field of device application.

Description

technical field [0001] The invention relates to the field of two-dimensional material analysis and characterization, in particular to a Weyl semi-metal material device design method based on bias voltage regulation. Background technique [0002] In recent years, following the rise of layered graphene, researchers have devoted themselves to the exploration of two-dimensional layered materials. Weyl semimetals are another research hotspot after graphene and topological insulators. Compared with the latter, the unique three-dimensional gapless linear dispersion band structure of Weyl semimetals makes it have many peculiar properties, such as: chirality Anomalies, chiral magnetic effects, anti-weak localization, chiral Landau levels, and negative magnetoresistance effects, etc. Weyl semimetals have broadband photon absorption capability, high absorption coefficient, and high carrier mobility (equal to graphene at room temperature), which makes Weyl semimetals widely used in opt...

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Problems solved by technology

[0003] In optoelectronic devices of low-dimensional materials, optoelectronic devices can directly convert photon energy into electrical signals, and play an important role as a bridge between electronics and photonics. The current is too small to meet the needs of industrial production. Therefore, increasing the photocurrent of Weyl semimetal devices through appropriate control methods to achieve better photoelectric performance has become a key issue that needs to be solved urgently.

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