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  • AIP Publishing  (42)
  • 1
    Online Resource
    Online Resource
    The effect of composition on pressure-induced devitrification in metallic glasses
    AIP Publishing ; 2013
    In:  Applied Physics Letters Vol. 102, No. 17 ( 2013-04-29)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 102, No. 17 ( 2013-04-29)
    Abstract: Long-range topological order (LRTO) was recently revealed in a Ce75Al25 metallic glass (MG) by a pressure-induced devitrification (PID) at 300 K. However, what compositions may have PID and an understanding of the physical and chemical controls behind PID are still not clear. We performed in situ high pressure x-ray diffraction measurements on CexAl1−x (x = 65, 70, and 80 at. %) MGs. Combining our experimental results and simulations, we found PID is very sensitive to compositions and can only exist over narrow compositional ranges. These results provide valuable guidance for searching for PID in MGs.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4803539
    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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  • 2
    Online Resource
    Online Resource
    Stronger three-phonon interactions revealed by molecular dynamics in materials with restricted phase space
    AIP Publishing ; 2021
    In:  Journal of Applied Physics Vol. 130, No. 20 ( 2021-11-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 130, No. 20 ( 2021-11-28)
    Abstract: Utilizing molecular dynamics (MD) simulations based on the highly precise force-fields, we find that phonon scattering strengths induced by the cubic anharmonicity can be significantly underestimated by the perturbation theory (PT) approach in materials with sizable frequency gaps or branch bunching. We trace this result to the additional three-phonon scatterings in MD enabled by the fluctuating phonon energy and the continuous energy exchange between modes. These channels are essential to accurately evaluate the zone-center phonon linewidth in boron arsenide as compared to the experiment and could noticeably lower the lattice thermal conductivity of beryllium telluride and tungsten carbide. Accordingly, due to the stronger three-phonon scatterings, four-phonon scatterings would become less important than previously believed in this type of material. Moreover, our work emphasizes the different phonon scattering processes in MD and PT simulations, offering new insights for an improved description of anharmonic properties.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0065889
    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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  • 3
    Online Resource
    Online Resource
    Magnetocaloric effect in Gd5Si2Ge2∕Gd composite materials
    AIP Publishing ; 2006
    In:  Journal of Applied Physics Vol. 99, No. 8 ( 2006-04-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 99, No. 8 ( 2006-04-15)
    Abstract: Spark plasma sintering technique has been applied to synthesize composite Gdx(Gd5Si2Ge2)1−x (x=0.3, 0.5, and 0.7) with layer structure using high-purity gadolinium (Gd) metal and Gd5Si2Ge2 alloys. The magnetocaloric effect of the composites was studied by directly measuring adiabatic temperature change (ΔTad) with a magnetic-field change of 1.5T using a homemade magnetocaloric effect measuring apparatus. With increasing x from 0.3 to 0.7, ΔTad peak temperature shifted from 286to293K and the peak values of ΔTad slowly increased from 1.6to2.0K at a magnetic-field change of 1.5T. Meanwhile, the ΔTad peak of the composite broadened as Gd content was increased. For x=0.7, the composite showed a ΔTad ranging from 1.1to2.0K at a magnetic-field change of 1.5T in a temperature range of 260–300K, which adapted to work as a room-temperature refrigerant.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.2158971
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 4
    Online Resource
    Online Resource
    Resistive switching and photovoltaic effects in ferroelectric BaTiO3-based capacitors with Ti and Pt top electrodes
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 111, No. 25 ( 2017-12-18)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 111, No. 25 ( 2017-12-18)
    Abstract: We have comparatively studied the dielectric, ferroelectric, conduction, and photovoltaic properties of Ti/BaTiO3 (BTO)/SrRuO3 (SRO) and Pt/BTO/SRO capacitors. The resistive switching (RS) is observed in the Pt/BTO/SRO capacitor while it is absent in the Ti/BTO/SRO capacitor, which may be attributed to the interfacial layer existing between Pt and BTO and the Ti/BTO Ohmic interface, respectively. Further analyses on the conduction mechanisms suggest that the RS may be caused by the opening/closing of conduction paths in the Pt/BTO interfacial layer, whereas the polarization is ruled out as the origin of RS because of the inconsistency between the RS switching voltages and coercive voltages. On the other hand, it is observed that the photovoltaic effects (PVEs) in both Ti/BTO/SRO and Pt/BTO/SRO capacitors are electrically unswitchable and the open-circuit voltages of the two capacitors are similar in magnitude, implying that the PVE is driven by an internal bias field rather than the polarization-induced field. The existence of such an internal bias field is indicated by the self-polarization and imprint phenomena. Our study demonstrates that the interfacial layer and the internal bias field can be the major causes for the RS and PVE in certain ferroelectric capacitors, respectively, whereas the polarization may not necessarily play a role.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4999982
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 211245-0
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  • 5
    Online Resource
    Online Resource
    Ballistic transport in sub-10 nm monolayer planar GaN transistors for high-performance and low-power applications
    AIP Publishing ; 2021
    In:  Applied Physics Letters Vol. 119, No. 16 ( 2021-10-18)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 119, No. 16 ( 2021-10-18)
    Abstract: With the constant scaling down of transistors, “More Moore” has put forward requirements for channel materials. Two-dimensional materials are considered as potential next-generation channel materials due to their unique physical properties. Herein, we study the ballistic transport characteristics of sub-10 nm monolayer (ML) planar GaN metal–oxide–semiconductor field-effect transistors (MOSFETs) based on density functional theory and the non-equilibrium Green's function method. The calculation results indicate that n-type ML planar GaN MOSFETs with gate lengths not less than 5 nm exhibit excellent subthreshold characteristics, fast switching speeds, and low switching energies, and the corresponding parameters (off-current, on-current, delay time, and power-delay product) can simultaneously meet the requirements of the International Roadmap for Devices and Systems for the 2028 horizon for high-performance and low-power applications. Therefore, ML planar GaN is predicted to be a reliable next-generation channel material to extend Moore's law.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0070904
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 211245-0
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  • 6
    Online Resource
    Online Resource
    Research on high-frequency small-load fatigue testing device driven by piezoelectric actuator
    AIP Publishing ; 2019
    In:  Review of Scientific Instruments Vol. 90, No. 7 ( 2019-07-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 90, No. 7 ( 2019-07-01)
    Abstract: A novel small-load fatigue testing device whose actuation resource is the piezoelectric material is proposed. The procedure of energy conversion and motion transfer is analyzed in detail. In the experiment by which the characteristic of the fatigue testing device is tested, the testing device works at resonance and the amplitude of the output could be up to 6.3 mm and output force is in the range of 0.6–2.5 N when the actuation frequency is higher than 100 Hz. The article presents the details of a piezoelectric device that is superior not only in smaller output force and higher testing frequency but also in high resolution, quick response, small scale, no noise, and anti-electromagnetic interference. The research about this kind of testing device benefits increasing the testing efficiency and development of a new material.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.5085851
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 7
    Online Resource
    Online Resource
    Observation of split defect-bound excitons in twisted WSe2/WSe2 homostructure
    AIP Publishing ; 2020
    In:  Applied Physics Letters Vol. 117, No. 15 ( 2020-10-12)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 117, No. 15 ( 2020-10-12)
    Abstract: The excitonic effects in two-dimensional transition metal dichalcogenides and their heterostructures have been extensively investigated. Significantly, the moiré excitons, induced by a moiré superlattice in a twisted heterostructure, have triggered tremendous attention, demonstrating the practicability of artificial excitonic crystals. Besides, recent works have shown that the excitonic states in homostructures also exhibit novel properties worthy of further development. Here, we present a tear-and-stack technique for fabricating a regular or a twisted homostructure. Such a strategy was utilized to reassemble a monolayer WSe2 into a twisted homostructure, and various excitons from this structure have been identified in the photoluminescence spectra. Interestingly, the unusual equidistant splitting was first observed in the defect-bound excitons. It is believed that this phenomenon is attributed to the various defect states and the local stacking patterns. This interpretation is supported by theoretical calculations, which show the dependence of the energy band structure on different defect states and local stacking patterns. These unconventional defect-bound excitons are key building blocks in the research of homostructures that highlight the feasibility of artificially manipulating local excitons for practical applications.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0015431
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 211245-0
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  • 8
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    Online Resource
    Concentration dependence of photoluminescence properties and exciton dynamics in Mn:CsPb(BrCl)3 quantum dots
    AIP Publishing ; 2022
    In:  Applied Physics Letters Vol. 120, No. 21 ( 2022-05-23)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 120, No. 21 ( 2022-05-23)
    Abstract: All-inorganic lead halide perovskite quantum dots (IPQDs) display some intriguing magnetic, electronic, and optical properties by introducing a transition metal Mn element. In this Letter, Mn-doped CsPb(BrCl)3 IPQDs with a cubic structure have been synthesized by the hot injection method. What make us excited is that the photoluminescence properties of a fixed ensemble of Mn-doped CsPb(BrCl)3 IPQDs systematically depend on the varying concentration. This experimental phenomenon can be well explained by the quantitative model based on photon reabsorption. The results combining experiments with theoretical models indicate that the photon reabsorption is of paramount importance in the analysis of the luminescence properties of colloidal quantum dots especially at high concentrations. Further analysis based on time-resolved fluorescence and transient absorption spectroscopy reveals the effect of the solution concentration on the Mn-doped CsPb(BrCl)3 IPQD exciton dynamics. The results suggest that exciton energy transfer can take place both inside and between IPQDs and also can be enhanced by increasing the concentration of a Mn-doped CsPb(BrCl)3 IPQD solution. These results are of great significance to accurately interpret and control the luminescence properties of IPQDs.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0090504
    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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  • 9
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    Online Resource
    Enhancing circular dichroism by super chiral hot spots from a chiral metasurface with apexes
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 110, No. 22 ( 2017-05-29)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 110, No. 22 ( 2017-05-29)
    Abstract: Manipulating light spin (or circular polarization) is an important research field and may find broad applications from sensors, display technology, to quantum computing and communication. To this end, planar metasurfaces with larger circular dichroism are strongly demanded. However, current planar chiral metasurface structures suffer from either fabrication challenge, especially from near-infrared to visible spectrum, or insufficient circular dichroism. Here, we report a chiral metasurface composed of achiral nanoholes which allow for precisely creating apexes in the designed structure. Our investigation indicates that the apexes act as super chiral hot spots and enable the highly concentrated near-field optical chirality leading to a remarkable enhancement of circular dichroism in the far-field. A 4-fold enhancement of the circular dichroism and a strong optical activity of ∼15 degrees have been experimentally achieved. Besides the enhanced chirality, our design genuinely overcomes the nanofabrication challenge faced in existing planar chiral metasurfaces.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4984920
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 10
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    Online Resource
    Determination of best particle tracking velocimetry method for two-dimensional dusty plasmas
    AIP Publishing ; 2022
    In:  Review of Scientific Instruments Vol. 93, No. 3 ( 2022-03-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 93, No. 3 ( 2022-03-01)
    Abstract: A practical procedure of determining the best choice of particle tracking velocimetry (PTV) methods for the analysis of two-dimensional (2D) dusty plasmas is provided. Using the measured particle positions with errors, the algorithm of PTV introduces further systematic errors while calculating particle velocities. To better quantify the errors, computer simulations of 2D Yukawa liquids are performed so that the true particle positions and velocities are precisely known. Synthetic data are achieved by varying the time interval between frames and adding the uncertainty with the different magnitude to the particle position data. Various PTV methods are used to calculate the velocity data from the achieved synthetic data, and the obtained velocity data from these PTV methods are compared with the true velocity data using two diagnostics to determine the best PTV method for various conditions. The results of various PTV methods with the simulation data are further confirmed by the demonstration using the 2D dusty plasma experimental data. This practical procedure is also applicable to determine the best PTV method for dusty plasmas in different conditions, such as those in Tokamaks, and for other physical systems, including colloids, granular materials, and fluid mechanics.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/5.0073342
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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