SILICON (<font>Si</font>)

Levinshteǐn, M. E.; Rumyantsev, Sergey

doi:10.1142/9789812832078_0001

Cited by 81 publications

(11 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The above examples show that the doping concentration of semiconductors can be tuned by several orders of magnitude, resulting in a significant tunability of their plasmonic properties. However, the key limitation of semiconductor-based SEIRA is that the carrier mobility in conventional semiconductors is typically too low to support plasmons with low damping at high carrier density [60,61,125,126] (see Figure 2), thus limiting their potential for SEIRA.…”

Section: Semiconductor-based Seiramentioning

confidence: 99%

Nanomaterial‐Based Plasmon‐Enhanced Infrared Spectroscopy

et al. 2018

View full text Add to dashboard Cite

Surface-enhanced infrared absorption (SEIRA) has attracted increasing attention due to the potential of infrared spectroscopy in applications such as molecular trace sensing of solids, polymers, and proteins, specifically fueled by recent substantial developments in infrared plasmonic materials and engineered nanostructures. Here, the significant progress achieved in the past decades is reviewed, along with the current state of the art of SEIRA. In particular, the plasmonic properties of a variety of nanomaterials are discussed (e.g., metals, semiconductors, and graphene) along with their use in the design of efficient SEIRA configurations. To conclude, perspectives on potential applications, including single-molecule detection and in vivo bioassays, are presented.

show abstract

Section: Semiconductor-based Seiramentioning

confidence: 99%

Nanomaterial‐Based Plasmon‐Enhanced Infrared Spectroscopy

et al. 2018

View full text Add to dashboard Cite

show abstract

“…We carried out numerical estimates for the structure with p-Si conducting channel. The semiconductor p-Si has quite high values of the electrical breakdown field strength (3 Á 10 5 V=cm), and high values of the saturation electron velocity (1:5 Á 10 7 cm=s) in high electric fields and relatively low electron mobility at room temperature [10]. The crystal heterostructures Si O 2 =Si =Si O 2 are mastered well enough by now [11].…”

Section: Calculated Values Of the First Harmonic Electric Field At Y mentioning

confidence: 99%

A Compact Source of Terahertz Radiation Based on an Open Corrugated Waveguide

Shchurova¹,

Namiot²

2020

Advances in Condensed-Matter and Materials Physics - Rudimentary Research to Topical Technology

View full text Add to dashboard Cite

We show that it is possible to produce terahertz wave generation in an open waveguide, which includes a multilayer dielectric plate. The plate consists of two dielectric layers with a corrugated interface. Near the interface, there is a thin semiconductor layer (quantum well), which is an electron-conducting channel. The generation and amplification of terahertz waves occur due to the efficient energy exchange between electrons, drifting in the quantum well, and the electromagnetic wave of the waveguide. We calculate the inhomogeneous electric fields induced near the corrugated dielectric interface by electric field of fundamental mode in the open waveguide. We formulate hydrodynamic equations and obtain analytical solutions for density waves of electrons interacting with the inhomogeneous electric field of the corrugation. According to numerical estimates, for a structure with a plate of quartz and sapphire layers and silicon-conducting channel, it is possible to generate electromagnetic waves with an output power of 25 mW at a frequency of 1 THz.

show abstract

“…We use fully relativistic normconserving pseudopotentials generated with Pseudo Dojo [44], and include spin-orbit coupling in all calculations. The BSE is solved on a 30 × 30 × 30 k-point grid with a rigid scissor shift applied to the DFT band structure to match the experimental band gap [45]. We use a 6 Ry cutoff for the statically screened Coulomb interaction and the highest 4 valence bands and lowest 2 conduction bands to converge the low-energy excitons.…”

Section: Numerical Calculationsmentioning

confidence: 99%

“…We use a 6 Ry cutoff for the statically screened Coulomb interaction and the highest 4 valence bands and lowest 2 conduction bands to converge the low-energy excitons. In the radiative lifetime calculations, we use experimental values for the static dielectric constant and effective masses [45,46] to remove a possible source of error. Due to the light electron mass, which leads to a steep conduction band valley, fully converging the radiative lifetimes in GaAs requires very fine Brillouin zone grids with a large computational cost.…”

Section: Numerical Calculationsmentioning

confidence: 99%

Ab initiocalculations of exciton radiative lifetimes in bulk crystals, nanostructures, and molecules

Chen

Jhalani

Palummo³

et al. 2019

Phys. Rev. B

View full text Add to dashboard Cite

Excitons are bound electron-hole pairs that dominate the optical response of semiconductors and insulators, especially in materials where the Coulomb interaction is weakly screened. Light absorption (including excitonic effects) has been studied extensively using first-principles calculations, but methods for computing radiative recombination and light emission are still being developed.Here we show a unified ab initio approach to compute exciton radiative recombination in materials ranging from bulk crystals to nanostructures and molecules. We derive the rate of exciton radiative recombination in bulk crystals, isolated systems, and in one-and two-dimensional materials, using Fermi's golden rule within the Bethe-Salpeter equation approach. We present benchmark calculations of radiative lifetimes in a GaAs crystal and in gas-phase organic molecules. Our work provides a general method for studying exciton recombination and light emission in bulk, nanostructured and molecular materials from first principles. arXiv:1901.08747v2 [cond-mat.mtrl-sci]

show abstract

SILICON (Si)

Cited by 81 publications

References 12 publications

Nanomaterial‐Based Plasmon‐Enhanced Infrared Spectroscopy

Nanomaterial‐Based Plasmon‐Enhanced Infrared Spectroscopy

A Compact Source of Terahertz Radiation Based on an Open Corrugated Waveguide

Ab initiocalculations of exciton radiative lifetimes in bulk crystals, nanostructures, and molecules

Contact Info

Product

Resources

About