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Manifestation of Kinetic Inductance in Terahertz Plasmon Resonances in Thin-Film Cd3As2.

Authors
  • Chanana, Ashish1
  • Lotfizadeh, Neda2
  • Condori Quispe, Hugo O1
  • Gopalan, Prashanth1
  • Winger, Joshua R3
  • Blair, Steve1
  • Nahata, Ajay1
  • Deshpande, Vikram V2
  • Scarpulla, Michael A1, 3
  • Sensale-Rodriguez, Berardi1
  • 1 Department of Electrical and Computer Engineering , The University of Utah , Salt Lake City , Utah 84112 , United States. , (United States)
  • 2 Department of Physics and Astronomy , The University of Utah , Salt Lake City , Utah 84112 , United States. , (United States)
  • 3 Department of Materials Science and Engineering , The University of Utah , Salt Lake City , Utah 84112 , United States. , (United States)
Type
Published Article
Journal
ACS Nano
Publisher
American Chemical Society
Publication Date
Apr 23, 2019
Volume
13
Issue
4
Pages
4091–4100
Identifiers
DOI: 10.1021/acsnano.8b08649
PMID: 30865427
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

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 ∼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 ∼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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