Ultra-broadband photodetection of Weyl semimetal TaAs up to infrared 10 μm range at room temperature
arXiv:1705.05086
Abstract
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. Here, we report that the Weyl semimetal TaAs based photodetector can operate at room temperature with spectral range from blue (438.5 nm) to mid-infrared (10.29 μm) light wavelengths and the responsibility and detectivity is more than 78 uA W-1 and 1.88*107 Jones, respectively. This is the first photodetector made by a Weyl semimetal and shows its promising in room-temperature mid-infrared photodetection.
References in corpus (8)
- Boron nitride substrates for high-quality graphene electronics
- Theoretical Discovery/Prediction: Weyl Semimetal states in the TaAs material (TaAs, NbAs, NbP, TaP) class
- Carbon Nanotubes as Schottky Barrier Transistors
- Observation of Weyl nodes in TaAs
- CMOS-compatible graphene photodetector covering all optical communication bands
- Quantum anomalous Hall effect and related topological electronic states
- Optical Signatures of Weyl Points in TaAs
- Symmetrical broken and nonlinear response of Weyl semimetal TaAs influenced by the topological surface states and Weyl nodes
Cited by in corpus (4)
- The Berry curvature dipole in Weyl semimetal materials: an ab initio study
- Epsilon-Near-Zero Response and Tunable Perfect Absorption in Weyl Semimetals
- Similar ultrafast dynamics of several dissimilar Dirac and Weyl semimetals
- Thermal-Field Electron Emission from Three-Dimensional Topological Semimetals