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  • AIP Publishing  (419)
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  • 1
    Online Resource
    Online Resource
    Retro and specular Andreev reflections and valley-spin switching effect in graphene superconducting heterojunction
    AIP Publishing ; 2023
    In:  Journal of Applied Physics Vol. 133, No. 14 ( 2023-04-14)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 133, No. 14 ( 2023-04-14)
    Abstract: We investigated Andreev reflection of graphene-based normal/superconductor single and double junctions under the modulation of non-resonant circularly polarized light, staggered potential, and exchange field. In the graphene-based normal/superconductor single junction, we discovered that the circularly polarized light can adjust the bandgap of retro Andreev reflection and specular Andreev reflection. The exchange field can change the position of the transition point between retro Andreev reflection and specular Andreev reflection. In the graphene-based normal/superconductor/normal double junction, when the light field is modulated from left circularly polarized light to right circularly polarized light, the valley-spin switching effect between pure elastic co-tunneling and pure crossed Andreev reflection can be realized. By changing the exchange field, we achieved the conversion of non-local transport between pure elastic co-tunneling and pure crossed Andreev reflection. In addition, the energy location and range of crossed Andreev reflection and elastic co-tunneling can be controlled by the staggered potential and the exchange field. Our results suggest that the device can implement light and exchange field control of the Andreev reflection process and the spin-valley switch.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0141906
    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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  • 2
    Online Resource
    Online Resource
    Electric-field control of electronic transport properties and enhanced magnetoresistance in La0.7Sr0.3MnO3/0.5BaZr0.2Ti0.8O3-0.5Ba0.7Ca0.3TiO3 lead-free multiferroic structures
    AIP Publishing ; 2017
    In:  Journal of Applied Physics Vol. 122, No. 13 ( 2017-10-07)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 122, No. 13 ( 2017-10-07)
    Abstract: We report the fabrication of lead-free multiferroic structures by depositing ferromagnetic La0.7Sr0.3MnO3 (LSMO) polycrystalline films on polished 0.5BaZr0.2Ti0.8O3-0.5Ba0.7Ca0.3TiO3 (BZT-BCT) piezoelectric ceramic substrates. By applying electric fields to the BZT-BCT along the thickness direction, the resistivity of LSMO films can be effectively manipulated via the piezoelectric strain of the BZT-BCT. Moreover, the LSMO polycrystalline films exhibit almost temperature independent and significantly enhanced magnetoresistance (MR) below TC. At T = 2 K and H = 8 T, the MR of polycrystalline films is approximately two orders of magnitude higher than that of LSMO epitaxial films grown on (LaAlO3)0.3(SrAl1/2Ta1/2O3)0.7 single-crystal substrates. The enhanced MR mainly results from the spin-polarized tunneling of charge carriers across grain boundaries. The LSMO/BZT-BCT structures with electric-field controllable modulation of resistivity and enhanced MR effect may have potential applications in low-energy consumption and environmentally friendly electronic devices.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4990513
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    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
    Experimental implementation of a degenerate optical resonator supporting more than 46 Laguerre-Gaussian modes
    AIP Publishing ; 2018
    In:  Applied Physics Letters Vol. 112, No. 20 ( 2018-05-14)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 112, No. 20 ( 2018-05-14)
    Abstract: Great efforts have been made to investigate photon's orbital angular momentum (OAM) due to its comprehensive applications ranging from micro-manipulation to biosciences. Recently, it has been proposed that the unlimited OAM number can be used as synthetic degrees of freedom and can be used for quantum simulation. Here, we demonstrate a vital step in manipulating such kind of unlimited degree of freedom simultaneously. We construct an optical resonator with four spherical mirrors, which is predicted to support lights in different Laguerre-Gaussian modes with well-defined OAMs. The transmitted peaks of more than 46 Laguerre-Gaussian modes are observed to be overlapped within the bandwidth of the resonator. The transmitted beam profiles are further obtained by locking the resonator. Our experimental results establish the critical techniques to manipulate multiple-OAM degrees of freedom, which are useful for quantum simulation.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5025132
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 4
    Online Resource
    Online Resource
    Morphotropic phase boundary and electric properties in (1− x )Bi0.5Na0.5TiO3- x BiCoO3 lead-free piezoelectric ceramics
    AIP Publishing ; 2012
    In:  Journal of Applied Physics Vol. 111, No. 12 ( 2012-06-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 111, No. 12 ( 2012-06-15)
    Abstract: Lead-free (1−x)Bi0.5Na0.5TiO3-xBiCoO3 (x = 0, 0.015, 0.025, 0.03, 0.035, 0.04, and 0.06) piezoelectric ceramics have been synthesized and their structure and electric properties have been investigated systemically. The rhombohedral-tetragonal morphotropic phase boundary (MPB) locates near x = 0.025–0.035. For the ceramics with x = 0.025, the saturated polarization (Ps), remnant polarization (Pr), coercive field (Ec), strain(S), piezoelectric constant (d33), and thickness electromechanical coupling factor (kt) are 40.6 μC/cm2, 35.4 μC/cm2, 5.25 kV/mm, 0.11%, 107pC/N, and 0.45, respectively. The low temperature humps of relative dielectric constant, which is indicative of TR-T, are becoming inconspicuous gradually with the increasing x and almost disappear at x = 0.04. The depolarization temperature Td decreases first and then increases with the increasing x. Our results may be helpful for further work on Bi0.5Na0.5TiO3-based lead-free piezoelectric ceramics.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4730770
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 5
    Online Resource
    Online Resource
    Mechanical and acoustic properties of a hybrid organic–inorganic perovskite, TMCM-CdCl3, with large piezoelectricity
    AIP Publishing ; 2020
    In:  APL Materials Vol. 8, No. 10 ( 2020-10-01)
    Details
    In: APL Materials, AIP Publishing, Vol. 8, No. 10 ( 2020-10-01)
    Abstract: Piezoelectric hybrid organic–inorganic perovskites have attracted significant attention due to their outstanding piezoelectricity comparable to perovskite oxides. However, their elastic properties, which determine the piezoelectric performance, have not yet been explored. Here, the elastic properties of a perovskite ferroelectric TMCM-CdCl3 (TMCM = trimethylchloromethyl ammonium) with a large piezoelectric effect are comprehensively investigated. High-pressure synchrotron powder x-ray diffraction experiments reveal that it exhibits a low bulk modulus of 14.58 GPa, which is an order of magnitude lower than those of perovskite oxides. In addition, Young’s moduli and shear moduli were calculated using density functional theory, and their values are significantly smaller than perovskite piezoceramics. Furthermore, the acoustic properties of TMCM-CdCl3 were calculated. Its longitudinal wave velocity is 3.86 km s−1–4.94 km s−1, and the corresponding specific acoustic impedance is 8.28 MRayl–10.21 MRayl. These maximum values are, respectively, 31.5%, 74.4%, and 8.4%, 73.1% lower than those from BaTiO3 and PbTiO3. Our findings disclose the soft nature and low acoustic impedance of hybrid perovskite piezoelectrics, which are critical to their applications in energy conversion devices.
    Type of Medium: Online Resource
    ISSN: 2166-532X
    URL: Article
    DOI: 10.1063/5.0027776
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2722985-3
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  • 6
    Online Resource
    Online Resource
    Exploring pulse-voltage-triggered optically induced electrohydrodynamic instability for femtolitre droplet generation
    AIP Publishing ; 2014
    In:  Applied Physics Letters Vol. 104, No. 26 ( 2014-06-30)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 104, No. 26 ( 2014-06-30)
    Abstract: We present a multipoint “virtual dispenser” to draw femtolitre droplets from a dielectric fluidic thin film using pulse-voltage-triggered optically induced electrohydrodynamic instability (PVT-OEHI). The “virtual dispenser” generates instability nucleation sites by controlling the optically induced lateral electrical stress and thermocapillary flow inside an optoelectronics chip. A time scale analysis shows that the electrohydrodynamic (EHD) instability phenomenon is present; however, its external manifestation is suppressed by OEHI. We observed two droplet dispensing mechanisms which correspond to different EHD states: Taylor cone formation and optically induced EHD jet. The EHD states transition could be realized by adjusting the pulse voltage parameters to alter the morphology of dispensed micron-scale polymer droplets, which could then be formed into organized arrays of microlenses with controllable diameter and curvature based on surface tension effect.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4885549
    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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  • 7
    Online Resource
    Online Resource
    Kinetics and mechanism of catalytic reduction of U(VI) with hydrazine on platinum catalysts in nitric acid media
    AIP Publishing ; 2022
    In:  Chinese Journal of Chemical Physics Vol. 35, No. 5 ( 2022-10-01), p. 813-822
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 35, No. 5 ( 2022-10-01), p. 813-822
    Abstract: The kinetics of U(IV) produced by hydrazine reduction of U(VI) with platinum as a catalyst in nitric acid media was studied to reveal the reaction mechanism and optimize the reaction process. Electron spin resonance (ESR) was used to determine the influence of nitric acid oxidation. The effects of nitric acid, hydrazine, U(VI) concentration, catalyst dosage and temperature on the reaction rate were also studied. In addition, the simulation of the reaction process was performed using density functional theory. The results show that the influence of oxidation on the main reaction is limited when the concentration of nitric acid is below 0.5 mol/L. The reaction kinetics equation below the concentration of 0.5 mol/L is found as: −dc(UO22+)/dt=kc0.5323(UO22+)c0.2074(N2H5+)c−0.2009(H+). When the temperature is 50 ◦C, and the solid/liquid ratio r is 0.0667 g/mL, the reaction kinetics constant is k=0.00199 (mol/L)0.4712/min. Between 20 ◦C and 80 ◦C, the reaction rate gradually increases with the increase of temperature, and changes from chemically controlled to diffusion-controlled. The simulations of density functional theory give further insight into the influence of various factors on the reaction process, with which the reaction mechanisms are determined according to the reaction kinetics and the simulation results.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/cjcp2103053
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 8
    Online Resource
    Online Resource
    Dissociative Photoionization of 1,4-Dioxane with Tunable VUV Synchrotron Radiation
    AIP Publishing ; 2017
    In:  Chinese Journal of Chemical Physics Vol. 30, No. 4 ( 2017-08-27), p. 379-388
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 30, No. 4 ( 2017-08-27), p. 379-388
    Abstract: The photoionization and photodissociation of 1,4-dioxane have been investigated with a reflectron time-of-flight photoionization mass spectrometry and a tunable vacuum ultraviolet synchrotron radiation in the energy region of 8.0–15.5 eV. Parent ion and fragment ions at m/z 88, 87, 58, 57, 45, 44, 43, 41, 31, 30, 29, 28 and 15 are detected under supersonic conditions. The ionization energy of DX as well as the appearance energies of its fragment ions C4H7O2+, C3H6O+, C3H5O+, C2H5O+, C2H4O+, C2H3O+, C3H5+, CH3O+, C2H6+, C2H5+/CHO+, C2H4+ and CH3+ was determined from their photoionization efficiency curves. The optimized structures for the neutrals, cations, transition states and intermediates related to photodissociation of DX are characterized at the B3LYP/6-31+G(d,p) level and their energies are obtained by G3B3 method. Possible dissociative channels of the DX are proposed based on comparison of experimental AE values and theoretical predicted ones. Intramolecular hydrogen migrations are found to be the dominant processes in most of the fragmentation pathways of 1,4-dioxane.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/30/cjcp1704068
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 9
    Online Resource
    Online Resource
    Influence of Thermal Treatments on In-depth Compositional Uniformity of CuIn(S,Se)2 Thin Films
    AIP Publishing ; 2012
    In:  Chinese Journal of Chemical Physics Vol. 25, No. 4 ( 2012-08-01), p. 481-486
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 25, No. 4 ( 2012-08-01), p. 481-486
    Abstract: CuIn(S,Se)2 thin films were prepared by thermal crystallization of co-sputtered Cu-In alloy precursors in S/Se atmosphere. In-depth compositional uniformity is an important prerequisite for obtaining device-quality CuIn(S,Se)2 absorber thin films. In order to figure out the influence of heat treatments on in-depth composition uniformity of CuIn(S,Se)2 thin films, two kinds of reaction temperature profiles were investigated. One process is “one step profile", referring to formation of CuIn(S,Se)2 thin films just at elevated temperature (e.g. 500 °C). The other is “two step profile", which allows for slow diffusion of S and Se elements into the alloy precursors at a low temperature before the formation and re-crystallization of CuIn(S,Se)2 thin films at higher temperature (e.g. first 250 °C then 500 °C). X-ray diffraction studies reveal that there is a discrepancy in the shape of (112) peak. Samples annealed with “one step profile" have splits on (112) peaks, while samples annealed with “two step profile" have relatively symmetrical (112) peaks. Grazing incident X-ray diffraction and energy dispersive spectrum measurements of samples successively etched in bromine methanol show that CuIn(S,Se)2 thin films have better in-depth composition uniformity after “two step profile" annealing. The reaction mechanism during the two thermal processing was also investigated by X-ray diffraction and Raman spectra.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1088/1674-0068/25/04/481-486
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 10
    Online Resource
    Online Resource
    Effect of Zn7Sb2O12 pre-synthesis on microstructure and properties of ZnO varistor ceramics
    AIP Publishing ; 2022
    In:  AIP Advances Vol. 12, No. 6 ( 2022-06-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 12, No. 6 ( 2022-06-01)
    Abstract: In this work, the Zn7Sb2O12 spinel phase is pre-synthesized at 980, 1000, 1020, 1040, and 1060 °C by mixing ZnO and Sb2O3 in a molar ratio of 7:1. ZnO varistors are prepared by replacing Sb2O3 with the Zn7Sb2O12 spinel phase. The effect of the Zn7Sb2O12 spinel on the electrical properties and microstructure of ZnO varistors is studied. The results show that Sb2O3 can produce free electrons and reduce the number of oxygen vacancies (VO⋅⋅) and grain size during the reaction process. The ZnO varistors prepared by replacing Sb2O3 with the Zn7Sb2O12 spinel phase have full grain growth and high density. In addition, ZnO varistors prepared by the Zn7Sb2O12 spinel phase replacing Sb2O3 can not only reduce the sintering temperature by 60 °C but also reduce the reverse voltage gradient rate of ZnO varistors from 7.85% to 1.2% on the basis of stable electrical properties and improve the impact stability of ZnO varistors. This method has the advantages of no change in formula composition and being a simple process and can provide ideas for the preparation of multilayer chip ZnO varistors.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/5.0096264
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2583909-3
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