Dynamically Controllable Terahertz Electromagnetic Interference Shielding by Small Polaron Responses in Dirac Semimetal PdTe2 Thin Films
Source abstract
Abstract
Abstract Terahertz (THz) electromagnetic interference (EMI) shielding materials is crucial for ensuring THz electromagnetic protection and information confidentiality technology. Here, it is demonstrated that high electrical conductivity and strong absorption of THz electromagnetic radiation by type‐II Dirac semimetal PdTe2 film make it a promising material for EMI shielding. Compared to MXene film, a commonly used metallic 2D material, the PdTe2 film demonstrates a remarkable 40.36% increase in average EMI shielding efficiency per unit thickness within a broadband THz frequency range. Furthermore, it is demonstrated that a photoinduced long life‐time THz transparency in Dirac semimetal PdTe2 films is attributed to the formation of small polarons due to the strong electron‐phonon coupling. A 15 nm‐thick PdTe2 film exhibits a photoinduced change of EMI SE of 1.1 dB, a value exceeding three times that measured on MXene film with a similar pump fluence. This work provides insights into the fundamental photocarrier properties in type‐II Dirac semimetals that are essential for designing advanced THz optoelectronic devices.
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Research context
OpenAlex topics: Topological Materials and Phenomena · Terahertz technology and applications · Metamaterials and Metasurfaces Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation Center Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology Shanghai 200093 China
Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineering Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China
Shanghai Institute of Intelligent Science and Technology Tongji University Shanghai 200092 China
School of Physics University of Wollongong Wollongong New South Wales 2522 Australia
Department of Physics and International Laser Center Lomonosov Moscow State University LeninskieGory 1 Moscow 19991 Russia
ILIT RAS‐Branch of the FSRC ⟪Crystallography and Photonics⟫ RAS Svyatoozerskaya 1 Shatura Moscow Region 140700 Russia
Funding
National Key Research and Development Program of China · National Natural Science Foundation of China · Science and Technology Commission of Shanghai Municipality · Higher Education Discipline Innovation Project · Fundamental Research Funds for the Central Universities
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