Ultra-broadband photodetection of Weyl semimetal TaAs up to infrared 10 {\mu}m range at room temperature

Understand

Photodetectors with broadband optical response have promising applications in many advanced optoelectronic and photonic devices.

• Especially, those with the detection range up to mid-infrared at room temperature are very challenging and highly desired.
• Recently, Weyl semimetal has been discovered and proposed to be favorable for photodetection since in general it breaks Lorentz invariance to have tilted chiral Weyl cones around Fermi level, which leads to chirality dependent photocurrents at arbitrarily long wavelength.
• Furthermore, the linear dispersion bands in Weyl cones result in very high carrier mobility and much reduced thermal carrier compared with the parabolic ones in narrow-gap semiconductors.