期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 46, 期 31, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/46/31/315107
关键词
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资金
- Japan Science and Technology Agency
- Japan Society for Promotion of Science
- PIRE TeraNano Program
- NSF
- USA
- Army Research Laboratory under ARL MSME Alliance, USA
- Office Of Internatl Science &Engineering
- Office Of The Director [968405] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [23760300] Funding Source: KAKEN
We study the dynamic effects in the double graphene-layer (GL) structures with the resonant-tunnelling (RT) and the negative differential inter-GL conductivity. Using the developed model, which accounts for the excitation of self-consistent oscillations of the electron and hole densities and the ac electric field between GLs (plasma oscillations), we calculate the admittance of the double-GL RT structures as a function of the signal frequency and applied voltages, and the spectrum and increment/decrement of plasma oscillations. Our results show that the electron-hole plasma in the double-GL RT structures with realistic parameters is stable with respect to the self-excitation of plasma oscillations and aperiodic perturbations. The stability of the electron-hole plasma at the bias voltages corresponding to the inter-GL RT and strong nonlinearity of the RT current-voltage characteristics enable using the double-GL RT structures for detection of teraherz (THz) radiation. The excitation of plasma oscillations by the incoming THz radiation can result in a sharp resonant dependence of detector responsivity on radiation frequency and the bias voltage. Due to a strong nonlinearity of the current-voltage characteristics of the double-GL structures at RT and the resonant excitation of plasma oscillations, the maximum responsivity, R-V(max), can markedly exceed the values (104-105) VW-1 at room temperature.
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