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  • AIP Publishing  (40)
  • 1
    Online Resource
    Online Resource
    Temperature dependence of germanium vacancy centers in high-quality diamond after 300 keV ion implantation
    AIP Publishing ; 2022
    In:  Journal of Applied Physics Vol. 132, No. 22 ( 2022-12-14)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 132, No. 22 ( 2022-12-14)
    Abstract: In this work, the temperature dependence of diamond GeV centers that were formed by germanium (Ge) ion implantation and annealed in a hydrogen atmosphere at 1000 °C was investigated by photoluminescence spectroscopy. It was found that the intensity of the GeV centers had a thermal quenching effect with the increase in temperature, and the activation energy was fitted at 62.32 meV. Then, the laser power dependence was mainly dependent on radiative recombination so that the diamond GeV center intensity increased with the laser power. Furthermore, the electron-phonon coupling and thermal softening effect were found between Ge ions and vacancies chemical bonds, which made the GeV center peak position red shift with the increase of temperature. Finally, the FWHM of the diamond GeV center exhibited both homogeneous (Lorentzian component) and inhomogeneous broadening (Gaussian component) at 80–280 K, indicating that the Lorentzian component was dominant in the FWHM of the GeV center.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0117951
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 2
    Online Resource
    Online Resource
    The mechanism of surface-seal splash during water entry
    AIP Publishing ; 2022
    In:  Physics of Fluids Vol. 34, No. 4 ( 2022-04-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 34, No. 4 ( 2022-04-01)
    Abstract: When a solid body impacts quiescent water at a certain velocity, the resultant “surface-seal splash” deforms and closes above the free surface. This study investigates the dynamics of the surface-seal splash by using a high-speed camera and particle image velocimetry (PIV) measurements. Based on PIV, an analytical model is developed to understand the mechanics of the surface-seal splash. The results indicate that the theoretical splash shapes are consistent with the experimental results. In addition, the effects of gravity, drag, surface tension, and aerodynamic pressure on the dynamics of surface-seal splash are also assessed, and the results indicate that the aerodynamic pressure plays a dominant role in the formation of the surface-seal splash.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/5.0085761
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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  • 3
    Online Resource
    Online Resource
    Phase-transition modulated, high-performance dual-mode photodetectors based on WSe 2 /VO 2 heterojunctions
    AIP Publishing ; 2019
    In:  Applied Physics Reviews Vol. 6, No. 4 ( 2019-12), p. 041407-
    Details
    In: Applied Physics Reviews, AIP Publishing, Vol. 6, No. 4 ( 2019-12), p. 041407-
    Type of Medium: Online Resource
    ISSN: 1931-9401
    URL: Article
    DOI: 10.1063/1.5124672
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2265524-4
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  • 4
    Online Resource
    Online Resource
    Temperature dependent thermal conductivity of IIa diamond by laser excited Raman spectroscopy
    AIP Publishing ; 2021
    In:  Applied Physics Letters Vol. 118, No. 19 ( 2021-05-10)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 118, No. 19 ( 2021-05-10)
    Abstract: The thermal conductivity of IIa diamond from low temperature (80 K) to room temperature was studied by laser-excited Raman spectroscopy. The laser has two complementary effects, one performing the Raman spectrum and the other resulting in the local heating on the surface of diamond. With the increase in measurement temperature on the surface of IIa diamond, the Raman peak shifts to the low energy side together with intensity quenching due to the strong electron–phonon coupling and lattice expansion, and the thermal conductivity of IIa diamond decreases as T−1, which is attributed to the creation and the annihilation of phonons.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0046656
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 5
    Online Resource
    Online Resource
    Prediction of four Si3N4 compounds by first-principles calculations
    AIP Publishing ; 2023
    In:  AIP Advances Vol. 13, No. 4 ( 2023-04-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 13, No. 4 ( 2023-04-01)
    Abstract: Four Si3N4 crystal structures were predicted using an ab initio evolutionary methodology. The mechanical and dynamic stabilities were confirmed by the density functional theory assuming zero-pressure conditions. Energetic stability calculations indicated that the structures are metastable phases at ambient pressure, but their formation is more favorable at high pressures. At zero pressure, the densities of the hp-Si3N4, cp-Si3N4, oc-Si3N4, and ti-Si3N4 phases were 3.21, 3.28, 3.70, and 3.24 g/cm3, respectively. The calculated band structures and densities of states indicated that they have semiconductive properties, with gaps ranging from 0.754 to 3.968 eV. Mechanical property calculations revealed that the hardness of the Si3N4 compounds ranged between 11.2 and 23.3 GPa, which were higher than the corresponding values for the synthesized Si3N4 phases. These four Si3N4 structures are potentially valuable candidates for the synthesis of Si3N4 compounds.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/5.0130194
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2583909-3
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  • 6
    Online Resource
    Online Resource
    Temperature/laser dependence of N3 optical centers in natural type Ia diamonds through photoluminescence spectroscopy
    AIP Publishing ; 2023
    In:  Journal of Applied Physics Vol. 134, No. 12 ( 2023-09-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 134, No. 12 ( 2023-09-28)
    Abstract: In this work, low-temperature photoluminescence spectroscopy was employed to investigate the N3 optical color center in natural type Ia diamond. The optical properties of the N3 center with regular changes in testing temperature and laser power were studied, and the energy level transition was also discussed. The results showed that the PL intensity of the N3 center enhanced sub-linearly with laser power increased, indicating that the electron transition of the N3 center was mainly radiative recombination with weak Auger recombination participation. In addition, the physical model was employed to analyze the change in the zero phonon line with the increase in the test temperature; it obtained thermal quenching activation energy (25.2 meV), bond softening, and strong interaction with acoustical phonons of the N3 center. The theoretical analysis of the broadening parameters revealed that the longitudinal optical phonon energy was 55.1 meV, and the electron–optic phonon coupling strength was 2.3 meV.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0166294
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 7
    Online Resource
    Online Resource
    Ab initio investigation on preferred orientation at the Al/Al3(Zr,Y) interface in Al–Zr–Y alloy
    AIP Publishing ; 2022
    In:  Journal of Applied Physics Vol. 131, No. 22 ( 2022-06-14)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 131, No. 22 ( 2022-06-14)
    Abstract: The orientation at the interfaces plays a vital role on the morphology of the aging precipitates in Al–Zr–Y composites. Experimental observation found out that the aging precipitates FCC-Al3(Zr,Y) phase does not have the typical “Al3Y core–Al3Zr shell” structure, which is common for most of the Al–Z–RE (rare earth elements) alloys. First-principles calculations were employed in this paper to reveal the orientations at the Al/Al3(Zr,Y) interface for the development of a new heat resistant Al–Zr–Y alloy. Three interface configurations D019–Al3Y(001)/Al(111), L12–Al3Y(111)/Al(111), and L12–Al3Y(001)/Al(001) were proposed for considerations. The calculations revealed that FCC-Al(001)/FCC-Al3Y(001) is the most stable interface. Zr and Y doping led to lower interface energies. In the early stage of growth, Zr doping dominated the interface energies due to the influence of surface energy. With the increase of the substituted elements content at the interface, the work of adhesion has a more significant effect on the interface energies, and the interface was dominated by Y doping. Therefore, the composite shell is finally formed as the FCC-Al3(Zr,Y) phase rather than the typical “Al3RE core–Al3Zr shell” structure. This result provides a guide for further research studies on the interface performance between Al3(Zr,Y) and Al matrix.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0090591
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 8
    Online Resource
    Online Resource
    High color rendering index and stable white light emitting diodes fabricated from lead bromide perovskites
    AIP Publishing ; 2019
    In:  Applied Physics Letters Vol. 115, No. 15 ( 2019-10-07)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 115, No. 15 ( 2019-10-07)
    Abstract: The tunable wavelength and high photoluminescence quantum yield of metal halide perovskite quantum dots (QDs) make them an extraordinary material for white light-emitting diodes (WLEDs). However, when perovskites with different halides are mixed, anion exchange occurs between them, limiting the development of WLEDs based on the perovskite. Meanwhile, the red emitting perovskite containing iodine is not stable, which is also a problem to overcome. In this paper, only bromide perovskites were adopted to fabricate the WLED. Hence, the anion exchange reaction can be avoided during their mixing process. CsPbBr3 nanoplatelets, CsPbBr3 QDs, and Mn-doped PEA2PbBr4 nanosheets were used as the blue, green, and red components of the WLEDs, respectively. All these perovskites preserve high luminance and stability, especially the red emitting component. Thus, the WLED shows high efficiency and excellent stability. By adjusting the amounts of these perovskites, WLEDs with different color temperatures were achieved, and the color rendering index reached up to 94.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5121800
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 9
    Online Resource
    Online Resource
    Influence of near threshold energy electron irradiation on the thermal conductivity of IIa diamond
    AIP Publishing ; 2021
    In:  Applied Physics Letters Vol. 119, No. 18 ( 2021-11-01)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 119, No. 18 ( 2021-11-01)
    Abstract: Diamond has the advantages of excellent thermal conductivity, and it is the material with the largest thermal conductivity currently known, which makes it the ideal heat sink. However, in the process of processing or as a heat sink for electronic devices, diamond is often exposed to a high-frequency, high-voltage, high-temperature, and high-energy environment, which has greatly affected the performance of diamonds. Therefore, in this paper, it systematically explores the influence of near threshold energy electron irradiation and annealing at different temperatures on the thermal conductivity of IIa diamond by the method of laser excited Raman spectroscopy. The results show that before 900 °C annealing, the main factor affecting thermal conductivity in IIa diamond is the large number of vacancy defects caused by near threshold energy electron irradiation. The irradiation and annealing both affect the thermal conductivity by controlling the vacancy defects concentration.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0067003
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 10
    Online Resource
    Online Resource
    A scanning tunneling microscope capable of imaging specified micron-scale small samples
    AIP Publishing ; 2012
    In:  Review of Scientific Instruments Vol. 83, No. 12 ( 2012-12-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 83, No. 12 ( 2012-12-01)
    Abstract: We present a home-built scanning tunneling microscope (STM) which allows us to precisely position the tip on any specified small sample or sample feature of micron scale. The core structure is a stand-alone soft junction mechanical loop (SJML), in which a small piezoelectric tube scanner is mounted on a sliding piece and a “U”-like soft spring strip has its one end fixed to the sliding piece and its opposite end holding the tip pointing to the sample on the scanner. Here, the tip can be precisely aligned to a specified small sample of micron scale by adjusting the position of the spring-clamped sample on the scanner in the field of view of an optical microscope. The aligned SJML can be transferred to a piezoelectric inertial motor for coarse approach, during which the U-spring is pushed towards the sample, causing the tip to approach the pre-aligned small sample. We have successfully approached a hand cut tip that was made from 0.1 mm thin Pt/Ir wire to an isolated individual 32.5 × 32.5 μm2 graphite flake. Good atomic resolution images and high quality tunneling current spectra for that specified tiny flake are obtained in ambient conditions with high repeatability within one month showing high and long term stability of the new STM structure. In addition, frequency spectra of the tunneling current signals do not show outstanding tip mount related resonant frequency (low frequency), which further confirms the stability of the STM structure.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.4769047
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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