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  • AIP Publishing  (26)
  • 11
    Online Resource
    Online Resource
    Giant phase shift effect in Tb0.3Dy0.7Fe2/Pb(Zr,Ti)O3 laminated composite
    AIP Publishing ; 2013
    In:  Applied Physics Letters Vol. 102, No. 11 ( 2013-03-18)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 102, No. 11 ( 2013-03-18)
    Abstract: In this letter we present a magnetic field-induced giant phase shift effect under resonant frequency in the bilayered magnetoelectric composite of Tb0.3Dy0.7Fe2(Terfenol-D) and Pb(Zr,Ti)O3. When the bias magnetic field is varied from 0.1 T to 0.3 T, the phase shift of the magnetoelectric effect under 83.2 kHz was as large as 180°, which implies a complete transformation from capacitor behavior to inductor behavior. The phase shift was analyzed in the polar coordinates, and the mechanism of this giant phase shift was considered as the ΔE effect of Terfenol-D. This giant phase shift effect may benefit existing phase modulation techniques.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4795870
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 12
    Online Resource
    Online Resource
    Simulation study of alleviating the communication blackout using high-power microwave irradiating plasma sheaths
    AIP Publishing ; 2022
    In:  Physics of Plasmas Vol. 29, No. 12 ( 2022-12-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 29, No. 12 ( 2022-12-01)
    Abstract: During hypersonic vehicle flight at high speed, plasma sheath on the vehicle surface will attenuate or even interrupt the communication signal, leading to the “communication blackout” problem. The vehicle probably moves a long distance during the communication blackout due to its high speed, which is a serious threat to the safety of the vehicle. This paper proposes a method to solve the communication blackout problem using high-power microwave (HPM) irradiation. The multicomponent compressible model, finite difference time domain algorithm, and multi-fluid model are used to simulate the interaction between HPM and plasma sheath. The results show that after HPM irradiation, the electromagnetic (EM) wave transmissivity of the plasma sheath will change, and the electric field (E-field) amplitude and irradiation time of HPM significantly influence the change of transmissivity. Thereafter, analyses of the changes of the collision and plasma frequencies of the plasma sheath after HPM irradiation showed the transmissivity of the plasma sheath to low-frequency EM waves is improved by optimizing E-field amplitude and irradiation time of HPM. Therefore, HPM irradiation can be performed to enhance the transmissivity of the plasma sheath to the communication signal, thus alleviating the communication blackout problem.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/5.0105947
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1472746-8
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  • 13
    Online Resource
    Online Resource
    Large-eddy simulation of turbulent flow and structures in a square duct roughened with perpendicular and V-shaped ribs
    AIP Publishing ; 2017
    In:  Physics of Fluids Vol. 29, No. 6 ( 2017-06-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 29, No. 6 ( 2017-06-01)
    Abstract: In this paper, highly disturbed turbulent flows confined within a square duct with uniformly spaced V-shaped ribs mounted on one wall are investigated using large-eddy simulation (LES). Two V-shaped (60° and 45°) rib cases are studied in comparison with the perpendicular (90°) rib case. The LES results are validated against a set of water-channel measurement data newly acquired by the authors. The effects of different shaped ribs on turbulent flow are systematically studied in terms of the mean velocity field, turbulence statistics, and coherent structures. The results show that strong secondary flows in the pattern of a pair of large symmetrical streamwise-elongated vortices exist in all three rib cases. The impacts of rib geometry on turbulent coherent structures are investigated using vortex identifiers, temporal autocorrections, spatial two-point autocorrelations, and velocity spectra.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/1.4985715
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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  • 14
    Online Resource
    Online Resource
    The mechanism and realization of a band-agile coaxial relativistic backward-wave oscillator
    AIP Publishing ; 2014
    In:  Applied Physics Letters Vol. 105, No. 18 ( 2014-11-03), p. 183503-
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 105, No. 18 ( 2014-11-03), p. 183503-
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4897437
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 15
    Online Resource
    Online Resource
    Preliminary experimental research of a Ka-band radial transit time oscillator
    AIP Publishing ; 2020
    In:  Review of Scientific Instruments Vol. 91, No. 10 ( 2020-10-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 91, No. 10 ( 2020-10-01)
    Abstract: Radial transit time oscillator (RTTO) can be relied on to generate effective coherent electromagnetic radiation in the millimeter wave domain. In this paper, the preliminary experimental research on a Ka-band RTTO is reported for the first time. In experiments, the radial electron beam emitted from the knife edge of the disk cathode is guided by the radial magnetic field. The bombardment trace on the nylon target verifies the emission and transportation uniformity of the radial e-beam. When the diode voltage is 410 kV, the beam current is 7.8 kA, and the magnetic field is 0.6 T, the RTTO can output microwaves with the power of 320 MW and the frequency of 31.35 GHz. As the diode voltage increases from 350 kV to 430 kV, the output microwave power will grow accordingly. Taking the ohmic loss into consideration, the experimental results are in agreement with the simulation ones.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/5.0012233
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 16
    Online Resource
    Online Resource
    Realization of independent contacts in barrier-separated InAs/GaSb quantum wells
    AIP Publishing ; 2023
    In:  Applied Physics Letters Vol. 122, No. 12 ( 2023-03-20)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 122, No. 12 ( 2023-03-20)
    Abstract: InAs/GaSb double quantum wells separated by a 100 Å AlSb middle barrier are grown by molecular beam epitaxy. We report a nanofabrication technique that utilizes the surface Fermi level pinning position in InAs [Efs(InAs)] for realizing independent electric contacts to each well. In particular, separate Ohmic contacts to the upper InAs quantum well are achieved by selectively etching down to the InAs, while contacts to the lower GaSb quantum well are obtained by the depletion method. For the latter, the upper InAs quantum well is locally pinched off by top etched trenches capped with a remaining 2–3 nm InAs layer. As a result of a relatively low Efs(InAs), applying a negative bias gate potential will create a conducting hole channel in GaSb and, hence, a separate Ohmic contact to the lower quantum well. This method is demonstrated with experiment and the support of a self-consistent band bending calculation. A number of experiments on separately probing Coulomb and tunnel-coupled InAs/GaSb systems now become accessible.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0133795
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 17
    Online Resource
    Online Resource
    Infrared camouflage based on the crystalline and amorphous GST multilayer films
    AIP Publishing ; 2022
    In:  Applied Physics Letters Vol. 121, No. 25 ( 2022-12-19)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 121, No. 25 ( 2022-12-19)
    Abstract: Infrared camouflage technology has received considerable attention for escaping the tracking by an infrared detector. The phase-changing material Ge2Sb2Te5 (GST) has widely been utilized to design dynamic spectral regulation. Herein, we propose a planar selective emitter based on the GST with different phases to simultaneously realize infrared camouflage and radiative heat dissipation. The fabricated emitter demonstrates a low emissivity of 32.6% inside the atmospheric windows and a high emissivity of 67.8% outside the atmospheric windows due to the formed quasi-optical cavity of the GST and the metal Ni layer in the structure. Moreover, it also has the potential to be used in different conditions by controlling the emission peak position. The facile process technique allows scalable production and large-scale deployment of the proposed emitter.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0134673
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 18
    Online Resource
    Online Resource
    Study on vehicle drag reduction simulation based on Suzen–Huang model
    AIP Publishing ; 2021
    In:  Physics of Plasmas Vol. 28, No. 6 ( 2021-06-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 28, No. 6 ( 2021-06-01)
    Abstract: In the past numerical simulation of plasma and fluid coupling, the usually used Suzen numerical simulation model has the defect that the error increases with the increase in excitation voltage. The static test of the ionic wind is used to modify the parameters of the Suzen simulation model, and it applied the modified Suzen model to the flow control of the automobile external flow field, which shows good consistency with the wind tunnel test results. Results show that the Suzen model modified by the static test results of the ionic wind is suitable for different excitation voltage conditions. The corrected body force and charge density distribution conform to the change trend of plasma discharge, and the error between the maximum ionic wind velocity obtained by simulation and the test result is within 4%; the modified Suzen model is successfully applied to the plasma flow control of automobile aerodynamic drag reduction. The results show that the exciter suppresses the generation of periodic separation vortices in the tail of the model, which makes the vorticity in the wake significantly decrease, thereby reducing the energy dissipation and the aerodynamic drag of the model. Through the research in this paper, the modified Suzen model reduces the simulation error. Plasma flow control technology is applied to the field of automobile aerodynamic drag reduction, which has accumulated important experience methods and data foundation for the engineering application of this technology. It also provides new methods for improving vehicle aerodynamic performance and fuel economy.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/5.0050374
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 1472746-8
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  • 19
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    Reduced thermal conductivity of epitaxial GaAsSb on InP due to lattice mismatch induced biaxial strain
    AIP Publishing ; 2021
    In:  Journal of Applied Physics Vol. 130, No. 1 ( 2021-07-07)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 130, No. 1 ( 2021-07-07)
    Abstract: High-quality lattice-matched and mismatched strained GaAs1−xSbx (0.37  & lt; x  & lt; 0.57) sub-micrometer epilayers are grown on InP by molecular beam epitaxy. Based on a heat conduction model regarding the heat transfer process between the thin GaAsSb films and thick InP substrates, the corresponding thermal conductivity of GaAsSb epilayers was accurately extracted from the power and temperature micro-Raman measurement. Combined with time-domain thermoreflectance measurements, we found that in comparison to the lattice-matched sample with Sb = 47.7%, a significant reduction in thermal conductivity of the lattice-mismatched sample with Sb = 37.9% and Sb = 56.2% is observed. With the help of diffraction reciprocal space maps and temperature-dependent photoluminescence results, the reduction in thermal conductivity is attributed to lattice-mismatch-induced biaxial tensile and compressive strain that can cause the breakage of the cubic crystal symmetry and provoke more defects.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0049136
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 20
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    Effect of thermal annealing on carrier localization and efficiency of spin detection in GaAsSb epilayers grown on InP
    AIP Publishing ; 2018
    In:  AIP Advances Vol. 8, No. 4 ( 2018-04-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 8, No. 4 ( 2018-04-01)
    Abstract: The effect of the thermal annealing on the optical and spin properties in GaAs0.44Sb0.56 epilayers grown on InP was investigated via photoreflectance, power-dependent and time-resolved photoluminescence spectroscopy as well as optical orientation measurement. The carrier’s localization and the optical spin detection efficiency increase with an increase of annealing temperature up to 600 °C. The enhancement of the spin detection efficiency is attributed to both the shortening of the electron lifetime and the prolonging of the spin lifetime as a result of the enhanced carriers’ localization induced by the annealing process. Our results provided an approach to enhance spin detection efficiency of GaAsSb with its PL emission in the 1.55 μm region.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5027803
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2583909-3
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