期刊
ACS NANO
卷 15, 期 3, 页码 5138-5146出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c10304
关键词
Dirac semimetal; fermiology; angle-resolved photoemission spectroscopy; terahertz detection; vdW heterostructure
类别
资金
- State Key Program for Basic R e s e a r c h o f China [2017YFA0305500, 2018YFA0306204, 2017YFA0303203]
- National Natural Science Foundation of China [11334008, 61675222, 61474130, 62075230, 62005249, 91850208, U1732273, 11904165, 11904166]
- STCSM Grants [1859078100, 19590780100, 19ZR1465400]
- Zhejiang Provincial Natural Science Foundation [LQ20F050005]
- Natural Science Foundation of Jiangsu Province [BK20190286]
This study achieved a type-II Dirac semimetal Ir1-xPtxTe2 with a protected crystal structure and tunable Fermi level through Pt doping, showing excellent performance at terahertz frequencies. Van der Waals integration with Dirac semimetals exhibited superb detector performance comparable to state-of-the-art detectors.
The discovery of Dirac semimetal has stimulated bourgeoning interests for exploring exotic quantum-transport phenomena, holding great promise for manipulating the performance of photoelectric devices that are related to nontrivial band topology. Nevertheless, it still remains elusive on both the device implementation and immediate results, with some enhanced or technically applicable electronic properties signified by the Dirac fermiology. By means of Pt doping, a type-II Dirac semimetal Ir1-xPtxTe2 with protected crystal structure and tunable Fermi level has been achieved in this work. It has been envisioned that the metal-semimetal-metal device exhibits an order of magnitude performance improvement at terahertz frequency when the Fermi level is aligned with the Dirac node (i.e., x similar to 0.3) and a room-temperature photoresponsivity of 0.52 A.W-1 at 0.12 THz and 0.45 A.W-1 at 0.3 THz, which benefited from the excitation of type-II Dirac fermions. Furthermore, van der Waals integration with Dirac semimetals exhibits superb performance with noise equivalent power less than 24 pW.Hz(-0.5), rivaling the state-of-the-art detectors. Our work provides a route to explore the nontrivial topology of Dirac semimetal for addressing targeted applications in imaging and biomedical sensing across a terahertz gap.
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