期刊
ACS NANO
卷 13, 期 4, 页码 4091-4100出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b08649
关键词
Dirac semimetals; terahertz; plasmonics; kinetic inductance; ultrafast carrier dynamics
类别
资金
- NSF MRSEC program at the University of Utah [DMR 1121252]
- NSF CAREER Award [1351389]
- College of Engineering, Office of the Vice President for Research
- Utah Science Technology and Research (USTAR) initiative of the State of Utah
Three-dimensional (3D) semimetals have been predicted and demonstrated to have a wide variety of interesting properties associated with their linear energy dispersion. In analogy to two-dimensional (2D) Dirac semimetals, such as graphene, Cd3As2 has shown ultrahigh mobility and large Fermi velocity and has been hypothesized to support plasmons at terahertz frequencies. In this work, we experimentally demonstrate synthesis of high quality large-area Cd3As2 thin films through thermal evaporation as well as the experimental realization of plasmonic structures consisting of periodic arrays of Cd3As2 stripes. These arrays exhibit sharp resonances at terahertz frequencies with associated quality factors (Q) as high as similar to 3.7 (at 0.82 THz). Such spectrally narrow resonances can be understood on the basis of a long momentum scattering time, which in our films can approach similar to 1 ps at room temperature. Moreover, we demonstrate an ultrafast tunable response through excitation of photoinduced carriers in optical pump/terahertz probe experiments. Our results evidence that the intrinsic 3D nature of Cd3As2 might provide for a very robust platform for terahertz plasmonic applications. Moreover, the long momentum scattering time as well as large kinetic inductance in Cd3As2 also holds enormous potential for the redesign of passive elements such as inductors and hence can have a profound impact in the field of RF integrated circuits.
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