<i>L</i>-subshell fluorescence yields for metallic uranium and thorium

Jq, Xu; Xu, Xiao‐Jun

doi:10.1103/physrevb.51.7834

Cited by 6 publications

(9 citation statements)

References 81 publications

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“…At high lattice temperature and/or high excitation levels, the relation becomes 34 P T ϳ(ប LO /)exp(Ϫប LO /k B T e ) with the effective hotelectron relaxation time. The practical evaluation of electron temperature as a function of input power complicates the numerical calculation considerably, 29 and I do not attempt it in the present paper. As for a theoretical study I take the electron temperature (T e ) as an input parameter in the calculations.…”

Section: Resultsmentioning

confidence: 99%

“…The results obtained from experimental 14 and theoretical 29 studies have indicated that the power signals detected in phonon emission experiments can be described by the electron energy loss rate ͑EELR͒ induced by electron-phonon interaction. The hot-electron energy loss problem in 2DSS's has been investigated rather extensively.…”

Section: A Electron Energy Loss Ratementioning

confidence: 99%

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Emission of acoustic and optical phonons by hot electrons in a two-dimensional electron system in parallel magnetic fields

1996

Phys. Rev. B

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In this paper, we present a detailed theoretical study on acoustic-and optical-phonon emission by hot electrons in Al x Ga 1Ϫx As parabolic quantum wells in parallel magnetic fields. We consider the situation where the phonon generation is detected by phonon emission experiments. The dependence of phonon emission on the magnetic field, excitation power, and phonon emission angle has been studied through calculating the electron energy loss rate in this configuration. The main results obtained from the present theoretical study are the following. ͑i͒ In low-, intermediate-, and high-energy excitations, phonon generation is mainly through electron-phonon interaction via piezoelectric, deformation-potential, and polar-optical coupling, respectively. ͑ii͒ The strongest acoustic-phonon emission can be observed around a magnetic field at which an electronic subband becomes depopulated, and the strongest LO-phonon emission occurs around a magnetic field where the energy spacing between two subbands equals the LO-phonon energy ͑electrophonon resonance effect͒. ͑iii͒ Phonon generation in the presence of parallel magnetic fields has a different angular distribution from that at zero and perpendicular magnetic fields.͓S0163-1829͑96͒016619-0͔

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Section: Resultsmentioning

confidence: 99%

Section: A Electron Energy Loss Ratementioning

confidence: 99%

Emission of acoustic and optical phonons by hot electrons in a two-dimensional electron system in parallel magnetic fields

1996

Phys. Rev. B

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“…We did not include the effects of electron-electron (e-e) screening within our calculations. The theoretical results reported have shown that at relatively high temperatures ͑and/or high-electron temperatures͒ the influence of the e-e screening on the transport properties ͑e.g., electron mobility, 10,20 magnetoresistivities, 9 and electron energy loss 21 ͒ is rather weak. This is because the inclusion of e-e screening through, e.g., random phase approximation results in an enhancement of the effective rate of electron scattering due to dynamical effects and in a reduction of the density of states by static screening over the entire temperature and electron density region.…”

Section: Resultsmentioning

confidence: 99%

Magneto-photon-phonon resonances in two-dimensional semiconductor systems driven by terahertz electromagnetic fields

Zhang

1996

Phys. Rev. B

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In this paper, we propose to study the magneto-photon-phonon resonance effects observed in terahertz ͑THz͒-driven two-dimensional electron gases in strong magnetic fields. The photon energy of the THz electromagnetic radiations is on the scale of the cyclotron energy ͑induced by strong magnetic fields͒ and the LO-phonon energy so that ͑i͒ THz radiations will modify strongly the process of electron energy relaxation in the device structure; ͑ii͒ electrons can gain the energy from ac and dc driving fields through, e.g., absorption of the photons and lose the energy through, e.g., emission of the LO phonons; and ͑iii͒ resonant scattering will occur among different Landau levels ͑LL's͒ when a condition M c ϩϭ LO is satisfied, where c (, LO ) is the cyclotron ͑photon, LO phonon͒ frequency and M is an index difference between two LL's. This leads to an enhancement of the resistivity and, consequently, to an enhanced rate of the absorption of the THz electromagnetic radiation in the sample systems. Varying the photon and cyclotron frequencies will result in a series of magneto-photon-phonon resonances observed in the dc resistivity ͑or conductivity͒ and/or in the optical absorption coefficient. We have presented a detailed theoretical study to observe this quantum resonance effect. ͓S0163-1829͑96͒10731-1͔

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“…Temperature control is often achieved using Peltier plates and transformation thermotics. [ 9–15 ] However, the application is limited by factors such as energy consumption, complicated structure design, and bulkiness. Ultrathin metal‐dielectric nanostructures with high absorption have been proposed for broadband infrared camouflage.…”

Section: Introductionmentioning

confidence: 99%

Infrared Camouflage Utilizing Ultrathin Flexible Large‐Scale High‐Temperature‐Tolerant Lambertian Surfaces

Huang

Pattanayak

et al. 2021

Laser & Photonics Reviews

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The development of ultrathin, flexible, large-scale, high-temperature-tolerant infrared camouflage devices, which are immune to the external environment, has emerged as an important unsolved challenge. This paper proposes an infrared camouflage device based on the Lambertian surface. The proposed device simultaneously exhibits low emissivity (≈0.1), low specular reflectance (≈0.05), and high temperature (290°C) tolerance over a broad infrared range (0.75-25 μm). Furthermore, the proposed device is ultrathin (≈50 μm), highly flexible, scalable, and can be fabricated at a low cost. The experimental results show that while camouflaging a target (at 65°C), the proposed Lambertian surface can reduce the peak value of the target-background contrast by 68.4% (indoor case) and 76.0% (outdoor case) compared to the conventional low-e (low-emissivity) smooth surface. The calculated detection range of the proposed low-e Lambertian surface is 60% less than that of both the low-e smooth surface and the blackbody. This work proposes a novel method to simultaneously control the radiation and the reflection, thereby introducing a new design paradigm for modern camouflage technology and energy harvesting applications.

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L-subshell fluorescence yields for metallic uranium and thorium

Cited by 6 publications

References 81 publications

Emission of acoustic and optical phonons by hot electrons in a two-dimensional electron system in parallel magnetic fields

Emission of acoustic and optical phonons by hot electrons in a two-dimensional electron system in parallel magnetic fields

Magneto-photon-phonon resonances in two-dimensional semiconductor systems driven by terahertz electromagnetic fields

Infrared Camouflage Utilizing Ultrathin Flexible Large‐Scale High‐Temperature‐Tolerant Lambertian Surfaces

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