Wave‐Vector‐Dependent Raman Scattering from Coupled Plasmon–Longitudinal Optical Phonon Modes and Fano Resonance in <i>n</i>‐type Scandium Nitride

Maurya, Krishna Chand; Biswas, Bidesh; Garbrecht, Magnus; Saha, Bivas

doi:10.1002/pssr.201900196

Cited by 13 publications

(6 citation statements)

References 45 publications

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“…At longer wavelengths, ϵ′ in ScN is nearly constant at 6. Because ScN is a degenerate semiconductor, 59 at long wavelengths (in the near-IR spectral regions) optical loss or ϵ″ increases due to free electron or Drude contributions. Nevertheless, ϵ″ of ScN at long-wavelength regions (see Figure 3b) is much smaller compared to the optical loss of the metals.…”

Section: Resultsmentioning

confidence: 99%

Near-UV-to-Near-IR Hyperbolic Photonic Dispersion in Epitaxial (Hf,Zr)N/ScN Metal/Dielectric Superlattices

Das

Maurya

Schroeder

et al. 2022

ACS Appl. Energy Mater.

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Hyperbolic metamaterials (HMMs) with extreme dielectric anisotropy have shown great promise in nanophotonic applications such as superlensing, enhancement of spontaneous emission, negative refraction, and the diverging photonic density of states. Noble metal-based metal/dielectric multilayers (e.g., Au/SiO2 and Ag/TiO2) and metallic (Au and Ag) nanowires embedded inside a dielectric matrix have been traditionally used to demonstrate HMM properties and for implementations into devices. Noble metals are, however, unstable at high temperatures, complementary metal oxide semiconductor incompatible, and difficult to deposit in thin-film form due to their high surface energies that limit their potential applications. TiN has emerged as an alternative plasmonic material to Au in recent years, and epitaxial TiN/Al0.72Sc0.28N metal/semiconductor superlattices were developed that exhibit excellent HMM properties. As TiN exhibits ε-near-zero (ENZ) at ∼500 nm, TiN/Al0.72Sc0.28N HMM also operates from ∼500 nm to long-wavelength regions. However, for several energy-conversion-related applications as well as for fundamental studies, it is desirable to achieve HMM wavelengths from the near-UV to the near-IR region of the spectrum. In this article, we demonstrate hyperbolic photonic dispersion in (Hf,Zr)N/ScN, a class of metal/semiconducting superlattice metamaterial that covers the near-UV to the near-IR spectral range. Epitaxial HfN/ScN, ZrN/ScN, and Hf0.5Zr0.5N/ScN superlattices are deposited on (001) MgO substrates and characterized with synchrotron-radiation X-ray diffraction as well as high-resolution electron microscopy techniques. Superlattices grow with cube-on-cube epitaxy and with sharp interfaces. Optical characterization reveals both type-I and type-II hyperbolic photonic dispersions as well as low losses and high figures-of-merit. Along with its high-temperature thermal stability, demonstration of HMM properties in (Hf,Zr)N/ScN metal/dielectric superlattices makes them potential candidates for HMM devices.

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Section: Resultsmentioning

confidence: 99%

Near-UV-to-Near-IR Hyperbolic Photonic Dispersion in Epitaxial (Hf,Zr)N/ScN Metal/Dielectric Superlattices

Das

Maurya

Schroeder

et al. 2022

ACS Appl. Energy Mater.

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“…Note that the LO phonon mode frequencies in ErN are about 110 cm −1 smaller than the LO phonon mode observed in the Raman spectrum of ScN. [ 31 ] Since the LO modes are primarily nitrogen atom vibrations, it highlights a stiffer force constant in ErN compared to ScN.…”

Section: Resultsmentioning

confidence: 99%

Vibrational Spectrum and Thermal Conductivity of Rare‐Earth Semiconducting Erbium Nitride Thin Films

Upadhya

Kumar

et al. 2022

Physica Rapid Research Ltrs

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Rare‐earth semiconducting mononitrides (RENs) are an emerging class of materials due to their unique electronic and magnetic properties originating from strongly localized 4f orbitals. Erbium nitride (ErN) is one of the most promising REN and attracts significant interest for spintronics, thermoelectric, and Gifford–McMahon cryo‐cooler applications. However, despite such progress, growth and characterization of the physical properties of ErN are rather challenging due to its propensity for oxidation, and no report on its thermal transport properties exists to date. Recently, high‐quality ErN thin films are deposited and are stabilized in ambient with thin capping layers. Herein this letter, first‐principles density functional perturbation theory to model the vibrational spectrum of ErN is utilized and the calculations with the phonon frequency measurements with inelastic Raman spectroscopy are verified. Consistent with its polar dielectric nature, ErN exhibits a longitudinal‐optical transverse‐optical phonon mode splitting at the Γ‐point with a separation of 333 cm−1. Time‐domain thermoreflectance is used to measure the low‐temperature (80 –300 K) thermal conductivity of ErN films. At room temperature, ErN films exhibit a low thermal conductivity of 1.16 ± 0.15 and 2 ± 0.2 W mK−1 on (001) MgO and (0001) Al2O3 substrates, respectively, making them attractive for thermoelectrics and thermal barrier coating applications.

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“…Therefore, its chemical composition varies within a certain range. Blast furnace slag is mainly composed of alkaline oxides CaO and MgO and acidic oxides Al 2 O 3 and SiO 2 , in which CaO, MgO, Al 2 O 3 , and SiO 2 contents are 35.8–43.9, 7.4–13, 6.2–12.5, and 32.4–36.2%, respectively. , In addition, blast furnace slag has a small amount of metal oxides and sulfides. The inherent rich oxide content of blast furnace slag determines that it can be used as a rich resource.…”

Section: Introductionmentioning

confidence: 99%

Study on Denitration Performance of Solid Waste Blast Furnace Slag Catalysts under Different Preparation Processes

et al. 2020

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In this article, blast furnace slag, a high-yield industrial solid waste, was taken as the research object and it was used as the main material. Bentonite was used as the binder, and water was added to shape the blast furnace slag into a small column. The denitration catalyst was prepared using different methods, its denitration performances were compared and analyzed, and the best preparation method and process parameters were screened. Results showed that bentonite will clearly improve denitration performance, and 4:1 blast furnace slag and bentonite was selected as the molding ratio to reduce the effect of bentonite on its performance, combined with the hardness and surface adhesion of the prepared carrier. Separately, the catalysts were prepared using citric acid impregnation, hydrothermal decomposition, and mixing method, and active Mn was loaded. Among them, the hydrothermal decomposition method cannot completely decompose in a closed kettle, resulting in a lower denitration performance. The catalyst prepared using the mixing method is superior to that prepared using the impregnation method because the active component prepared by the former was more uniformly dispersed, and simple and easy to operate, which can meet the needs of the excess denitration catalysts of small enterprises.

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Wave‐Vector‐Dependent Raman Scattering from Coupled Plasmon–Longitudinal Optical Phonon Modes and Fano Resonance in n‐type Scandium Nitride

Cited by 13 publications

References 45 publications

Near-UV-to-Near-IR Hyperbolic Photonic Dispersion in Epitaxial (Hf,Zr)N/ScN Metal/Dielectric Superlattices

Near-UV-to-Near-IR Hyperbolic Photonic Dispersion in Epitaxial (Hf,Zr)N/ScN Metal/Dielectric Superlattices

Vibrational Spectrum and Thermal Conductivity of Rare‐Earth Semiconducting Erbium Nitride Thin Films

Study on Denitration Performance of Solid Waste Blast Furnace Slag Catalysts under Different Preparation Processes

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