Electrodynamics of high-temperature superconductors investigated with coherent terahertz pulse spectroscopy

Brorson, S. D.; Buhleier, R.; Trofimov, I. E.; White, Jeffrey O.; Ludwig, Ch.; Balakirev, Fedor; Habermeier, H.–U.; Kühl, J.

doi:10.1364/josab.13.001979

Cited by 56 publications

(57 citation statements)

References 48 publications

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“…Brorson et al [240] showed systematic variation of transition temperature, plasma frequency, London penetration depth, quasiparticle scattering rate, etc., on Pr-doping in YBa 2 Cu 3 O 7−δ using THz spectroscopy. The OPTP measurements provided the temporal scan of superconducting phase formation by first breaking the cooper pairs via optical pump and then probing their formation via THz probe at picosecond time scale.…”

Section: Nonequilibrium Dynamics Of Superconducting Cooper Pairmentioning

confidence: 99%

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Terahertz Electrodynamics in Transition Metal Oxides

Prajapati

Dagar

et al. 2019

Advanced Optical Materials

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adom.201900958. 2−y 2 , d z 2 ) levels. [35] The splitting of the d-orbital was successfully explained by the crystal field theory. The ground state properties of these materials are mainly governed by the two interactions; i) the electron correlations (U) and, ii) SOC (λ) in the crystal field split narrow bands. [36] Among d electron systems, electrons in 3d TMOs experiences large electron correlations due to localized nature of 3d orbitals. The idea of electron-electron interaction was given by Sir N. F. Mott in 1949. It originated from the fact that the NiO was expected to be a metal according to the band theory, while the experiments showed insulating behavior. [37][38][39][40][41] This disagreement of experiments with the theory was explained by Hubbard who attributed the insulating state to the splitting

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Section: Nonequilibrium Dynamics Of Superconducting Cooper Pairmentioning

confidence: 99%

“…[91] The temperaturedependent real conductivity was consistent with the metallic Adv. [91,[235][236][237][238][239][240] 2020, 8, 1900958 Figure 29.…”

Section: Thz Electrodynamics Of Superconducting Cooper Pairmentioning

confidence: 99%

Terahertz Electrodynamics in Transition Metal Oxides

Prajapati

Dagar

et al. 2019

Advanced Optical Materials

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“…Among the earlier reports utilizing classical [100][101][102][103][104][105][106][107][108][109][110][111][112][113][114][115][116][117][118][119] or high transition temperature (T c ) superconductors [120][121][122][123][124][125][126][127][128][129][130][131][132][133][134][135] for THz metamaterial design, we briefly review a few selected works employing three different types of superconductors, i.e., yttrium barium copper oxide (YBCO), Nb, and NbN, with their functionalities based on external variables and the nonlinear phenomena. While VO 2 has been utilized for both a film-type THz modulation medium and subwavelength structures to adjust the electromagnetic properties, superconductors have mainly been investigated to improve the performance of metallic structures as metamaterials.…”

Section: Superconductorsmentioning

confidence: 99%

“…[100,136] Optical excitation with near infrared femtosecond laser pulses breaks superconducting Cooper pairs and creates quasiparticles that recombine on the picosecond timescale. Photoexcitation using femtosecond laser pulses facilitates optical control of superconductor-based metamaterials at the picosecond timescale because the photon energy of the optical pump beam is higher than the binding energy of high-T c superconductor Cooper pairs (2-75 meV).…”

Section: Optical Excitationmentioning

confidence: 99%

Dynamic Terahertz Plasmonics Enabled by Phase‐Change Materials

Jeong

Bahk

Kim

2019

Advanced Optical Materials

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Phase‐change phenomena have been an attractive research theme for decades due to the dynamic transition of material properties providing extraordinary capabilities for versatile optical device applications. Even at the terahertz (THz) frequency regime, phase‐change materials (PCMs) promote the development of dynamic devices, especially when combined with a plasmonic approach delivering strong field enhancement and localization. According to the design of plasmonic metamaterials or hybrid composites, PCMs can actively modulate the electromagnetic properties of THz waves through thermal, electrical, and optical means. In turn, THz waves can affect the PCM properties in the nonlinear regime due to the intense field strength enhancement by plasmonic structures. Here, a few types of PCMs demonstrating promising potential in THz plasmonic applications are introduced. Starting from the best‐known transition metal oxide, vanadium dioxide (VO2), which possesses an insulator‐to‐metal phase transition near room temperature, superconductors, chalcogenides, ferroelectrics, liquid crystals, and liquid metals are covered along with their phase‐change properties and the control mechanisms infused with THz plasmonic applications. The corresponding recent progress presenting how PCMs combined with plasmonic structures can demonstrate effective THz modulation is reviewed. This general overview may provide a better understanding of dynamic THz plasmonics and new ideas for future THz technology.

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“…The derivation of the London penetration depth from the transmission data relies on the basic assumption of a phenomenological two-fluid model [23]. The total conductivity is supposed to be a sum of the contributions due to normally conducting carriers and superconducting carriers.…”

Section: Electrodynamic C-axis Propertiesmentioning

confidence: 99%