Positron lifetime in boron steel

Cai-guo, Zhang; Liu‐Juan, Zou; Wang, Gui-Ian; Tang, Yunlian

doi:10.1088/0022-3727/24/11/029

Cited by 4 publications

(5 citation statements)

References 2 publications

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“…Thus the resulting best fit value of the k parameter obtained for the C1-HH1 and C1-LH1 ASW PR features can be easily explained. It has already been shown [27] that the expression of the PR lineshape model associated with the electromodulated dielectric function of a 2D band-to-band critical point is formally the same as equation ( 6) with k = 1.…”

Section: Resultsmentioning

confidence: 99%

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Step pseudomorphic asymmetric wells: an optical study in the framework of III - V strain-induced sub-two-dimensional quantum systems

Geddo

Lernia

Andreani

1997

Semicond. Sci. Technol.

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An optical study of the basic epitaxial structure for the fabrication of strain-induced sub-two-dimensional quantum systems was performed by comparing photoreflectance measurements with calculations of the energy positions and the relative intensities of the interband transitions originating in the different regions of the sample. It is shown that by taking advantage of the explicit calculation of the overlap integrals associated with the asymmetric well transitions, the complicated optical response of the whole heterostructure can easily be interpreted. This, in turn, enables the development of the optical investigation of the inner GaAs well (the active region of the device) by means of photoreflectance even at room temperature, as an alternative to the most commonly used low-temperature luminescence techniques.

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Section: Resultsmentioning

confidence: 99%

“…It has indeed been proved that uncoupled multiple quantum well (MQW) PR spectroscopy, in contrast to that of bulk materials, is first-derivative modulation spectroscopy [21,27].…”

Section: Experiments and Lineshape Considerationsmentioning

confidence: 99%

Step pseudomorphic asymmetric wells: an optical study in the framework of III - V strain-induced sub-two-dimensional quantum systems

Geddo

Lernia

Andreani

1997

Semicond. Sci. Technol.

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“…[ 1–3 ] Owning to the advantages of random lasers such as simplicity, small size and low spatial coherence, [ 4–6 ] such lasers have been extensively studied in various fields including speckle‐free imaging, [ 4,7 ] super‐resolution spectroscopy, [ 8 ] information security, [ 9 ] sensing, [ 10,11 ] and biomedical. [ 12 ] Nevertheless, controlling the emission wavelength of random lasers is still challenging due to the absence of optical cavity, which limits their applications in some fields such as medical detection, [ 13 ] photonic crystals, [ 14,15 ] and high‐precision sensors. [ 16,17 ] Therefore, emission characteristics of random lasers, especially the control strategies of the emission wavelengths, have attracted increasing attention, so far, various optical structures have been reported, including liquid crystals, [ 18 ] quantum dots, [ 19,20 ] graphene/semiconductor heterostructures, [ 21 ] polymer films, [ 22 ] disordered photonic crystal platform, [ 23 ] perovskite single crystals, [ 24 ] fibers, [ 5,25,26 ] and fiber gratings.…”

Section: Introductionmentioning

confidence: 99%

Tunable Plasmonic Random Laser Based on Emitters Coupled to Plasmonic Resonant Nanocavities of Silver Nanorod Arrays

Zhang

Wang

Ghafoor

et al. 2022

Advanced Optical Materials

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Random lasers are generated by multiple light scattering in disordered optically gain medium, which are fundamentally different from conventional lasers. Control of emission properties, especially emission wavelength for random lasers is still challenging due to absence of optical cavity. Although plasmonic random lasers exhibit well‐controlled properties, most of studies on plasmonic random lasers to date are still focused on scattering amplification by disorder metal nanoparticles. Here, a tunable random laser based on emitters of Nile red/poly‐methyl methacrylate (PMMA) coupled to plasmonic resonant nanocavities of silver nanorod arrays is presented. The plasmonic random laser has very strong and narrow emission peaks and a very low lasing threshold of 22.8 µJ, resulting from plasmon resonance energy transfer (PRET), the enhanced absorption, scattering, and excitation rates of Nile red/PMMA due to strong localized electric fields in the nanocavities, and enhanced multiple light scattering from the disorder–order hybrid silver nanorod arrays. Furthermore, the lasing wavelength can be tuned in a wide range from 623 to 654 nm by different order harmonic modes of the plasmonic resonant nanocavities. This work not only provides a new strategy to design tunable random lasers, but also opens up their potential applications in medicine and sensing.

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“…After the introduction of the Blume-Capel (BC) model by Blume [2] and independently by Capel, [3] it has evolved to many different forms and many different techniques were employed to study them. Some of the common techniques that are used to study the spin-1 BC model may be given as follows: The mean-field approximation, [4] the effective-field theory, [5] the cluster variation method, [6] the cluster expansion method, [7] a real-space renormalizationgroup approximation, [8] the Monte Carlo simulation, [9] using a celular automation, [10] using an improved pair approximation within the framework of Bogoliubov variational approach for the free energy, [11] on the Voronoi-Delaunay random lattices, [12] using the Wang-Landau method, [13] linear chain approximation [14] and so on.…”

Section: Introductionmentioning

confidence: 99%

Bond Dilution Effects on Bethe Lattice the Spin-1 Blume–Capel Model

Albayrak¹

2017

Commun. Theor. Phys.

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The bond dilution effects are investigated for the spin-1 Blume–Capel model on the Bethe lattice by using the exact recursion relations. The bilinear interaction parameter is either turned on ferromagnetically with probability p or turned off with probability 1 – p between the nearest-neighbor spins. The thermal variations of the order-parameters are studied in detail to obtain the phase diagrams on the possible planes spanned by the temperature (T), probability (p) and crystal field (D) for the coordination numbers q = 3, 4, and 6. The lines of the second-order phase transitions, Tc-lines, combined with the first-order ones, Tt-lines, at the tricritical points (TCP) are always found for any p and q on the (T, D)-planes. It is also found that the model gives only Tc-lines, Tc-lines combined with the Tt-lines at the TCP’s and only Tt-lines with the consecutively decreasing values of D on the (T, p)-planes for all q.

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Positron lifetime in boron steel

Cited by 4 publications

References 2 publications

Step pseudomorphic asymmetric wells: an optical study in the framework of III - V strain-induced sub-two-dimensional quantum systems

Step pseudomorphic asymmetric wells: an optical study in the framework of III - V strain-induced sub-two-dimensional quantum systems

Tunable Plasmonic Random Laser Based on Emitters Coupled to Plasmonic Resonant Nanocavities of Silver Nanorod Arrays

Bond Dilution Effects on Bethe Lattice the Spin-1 Blume–Capel Model

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