AI Article Synopsis
- Terahertz photodetectors utilizing intrinsic magnetic topological insulators, like MnBiTe, exhibit impressive sensitivity and performance at room temperature due to their unique material properties.
- MnBiTe flakes demonstrate sensitivity comparable to commercial detectors, achieving a noise equivalent power of 13 pW/Hz at 0.275 THz, facilitating high-resolution terahertz imaging through the nonlinear Hall effect.
- Notably, these detectors exhibit strong polarization-dependent responses and a novel power-controlled reversal of response in devices combining MnBiTe and graphene, highlighting the potential for advanced applications of topological materials in electronics.
Article Abstract
Terahertz photodetectors based on emergent intrinsic magnetic topological insulators promise excellent performance in terms of highly sensitive, anisotropic and room-temperature ability benefiting from their extraordinary material properties. Here, we propose and conceive the response features of exfoliated MnBiTe flakes as active materials for terahertz detectors. The MnBiTe-based photodetectors show the sensitivity rival with commercially available ones, and the noise equivalent power of 13 pW/Hz under 0.275 THz at room-temperature led by the nonlinear Hall effect, allowing for the high-resolution terahertz imaging. In addition, a large anisotropy of polarization-dependent terahertz response is observed when the MnBiTe device is tuned into different directions. More interestingly, we discover an unprecedented power-controlled reversal of terahertz response in the MnBiTe-graphene device. Our results provide feasibility of manipulating and exploiting the nontrivial topological phenomena of MnBiTe under a high-frequency electromagnetic field, representing the first step toward device implementation of intrinsic magnetic topological insulators.
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| http://dx.doi.org/10.1021/acs.nanolett.2c02434 | DOI Listing |
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