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  • AIP Publishing  (16)
  • 1
    Online Resource
    Online Resource
    Effects of sub-bandgap illumination on electrical properties and detector performances of CdZnTe:In
    AIP Publishing ; 2014
    In:  Applied Physics Letters Vol. 104, No. 23 ( 2014-06-09)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 104, No. 23 ( 2014-06-09)
    Abstract: The effects of sub-bandgap illumination on electrical properties of CdZnTe:In crystals and spectroscopic performances of the fabricated detectors were discussed. The excitation process of charge carriers through thermal and optical transitions at the deep trap could be described by the modified Shockley-Read-Hall model. The ionization probability of the deep donor shows an increase under illumination, which should be responsible for the variation of electrical properties within CdZnTe bulk materials with infrared (IR) irradiation. By applying Ohm's law, diffusion model and interfacial layer-thermionic-diffusion theory, we obtain the decrease of bulk resistivity and the increase of space charge density in the illuminated crystals. Moreover, the illumination induced ionization will further contribute to improving carrier transport property and charge collection efficiency. Consequently, the application of IR irradiation in the standard working environment is of great significance to improve the spectroscopic characteristics of CdZnTe radiation detectors.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4883403
    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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  • 2
    Online Resource
    Online Resource
    Highly mobile carriers in a candidate of quasi-two-dimensional topological semimetal AuTe2Br
    AIP Publishing ; 2019
    In:  APL Materials Vol. 7, No. 10 ( 2019-10-01)
    Details
    In: APL Materials, AIP Publishing, Vol. 7, No. 10 ( 2019-10-01)
    Abstract: We report the crystal and electronic structures of a noncentrosymmetric quasi-two-dimensional (2D) candidate of topological semimetal AuTe2Br. The Fermi surface of this layered compound consists of 2D-like, topological trivial electron and nontrivial hole pockets, which host a Dirac cone along the kz direction. Our transport measurements on the single crystals show highly anisotropic, compensated low-density electrons and holes, both of which exhibit ultrahigh mobility at a level of 105 cm2 V−1 s−1 at low temperature. The highly mobile, compensated carriers lead a nonsaturated, parabolic magnetoresistance as large as 3 × 105 in single-crystalline AuTe2Br in a magnetic field up to 58 T.
    Type of Medium: Online Resource
    ISSN: 2166-532X
    URL: Article
    DOI: 10.1063/1.5121751
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2722985-3
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  • 3
    Online Resource
    Online Resource
    In-situ transmission electron microscopy imaging of formation and evolution of LixWO3 during lithiation of WO3 nanowires
    AIP Publishing ; 2016
    In:  Applied Physics Letters Vol. 108, No. 23 ( 2016-06-06)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 108, No. 23 ( 2016-06-06)
    Abstract: The phase transition from monoclinic WO3 to cubic LixWO3 during lithiation of WO3 is one of the key features for tungsten oxide as the most used electrochromic material. Conventionally, the lithium intercalation of WO3 has been studied by building generic layered electrochromic device combining with structural characterization and electrochemistry measurement at macro scale. In-situ transmission electron microscopy (in-situ TEM) has been proposed as a method for revealing the detailed mechanism of structural, physical, and chemical properties. Here, we use in-situ TEM method to investigate the formation and evolution of LixWO3 in real-time during the electrochemical lithiation of WO3 nanowires. The dynamic lithiation process is recorded by TEM imaging, diffraction, and electron energy loss spectroscopy. The WO3-LixWO3 phase boundary of reaction front has been observed at high resolution. The timeliness of crystallinity of LixWO3 and the intercalation channels for Li ions are also identified. Moreover, the co-existence of both polycrystalline Li-poor area and amorphous Li-rich phases of LixWO3 was found. Our results provide an insight into the basic lithiation process of WO3, which is significantly important for understanding the electrochromic mechanism of tungsten oxide.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4950968
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 4
    Online Resource
    Online Resource
    Commissioning of helium injector for coupled radio frequency quadrupole and separated function radio frequency quadrupole accelerator
    AIP Publishing ; 2014
    In:  Review of Scientific Instruments Vol. 85, No. 2 ( 2014-02-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 85, No. 2 ( 2014-02-01)
    Abstract: A project to study a new type of acceleration structure has been launched at Peking University, in which a traditional radio frequency quadrupole (RFQ) and a separated function radio frequency quadrupole are coupled in one cavity to accelerate the He+ beam. A helium injector for this project is developed. The injector consists of a 2.45 GHz permanent magnet electron cyclotron resonance ion source and a 1.16 m long low energy beam transport (LEBT). The commissioning of this injector was carried out and an onsite test was held in June 2013. A 14 mA He+ beam with the energy of 30 keV has been delivered to the end of the LEBT, where a diaphragm with the diameter of 7 mm is located. The position of the diaphragm corresponds to the entrance of the RFQ electrodes. The beam emittance and fraction were measured after the 7 mm diaphragm. Its rms emittance is about 0.14 π mm mrad and the fraction of He+ is about 99%.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.4828375
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 5
    Online Resource
    Online Resource
    Ligand-size and ligand-chain hydrophilicity effects on the relaxometric properties of ultrasmall Gd2O3 nanoparticles
    AIP Publishing ; 2016
    In:  AIP Advances Vol. 6, No. 6 ( 2016-06-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 6, No. 6 ( 2016-06-01)
    Abstract: The relaxometric properties of ultrasmall Gd2O3 nanoparticles coated with various ligands were investigated. These ligands include small diacids with hydrophobic chains, namely, succinic acid (Mw = 118.09 amu), glutaric acid (Mw = 132.12 amu), and terephthalic acid (Mw = 166.13 amu), and large polyethylenimines (PEIs) with hydrophilic chains, namely, PEI-1300 (M¯n=1300) and PEI-10000 (M¯n=10000). Ligand-size and ligand-chain hydrophilicity effects were observed. The longitudinal (r1) and transverse (r2) water proton relaxivities generally decreased with increasing ligand-size (the ligand-size effect). The ligand-size effect was weaker for PEI because its hydrophilic chains allow water molecules to access the nanoparticle (the ligand-chain hydrophilicity effect). This result was explained on the basis of the magnetic dipole interaction between the dipoles of the nanoparticle and water proton. In addition, all samples were found to be non-toxic in cellular cytotoxicity tests.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.4954182
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 2583909-3
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  • 6
    Online Resource
    Online Resource
    Real-time observation of dynamic process of oxygen vacancy migration in cerium oxides under electric field
    AIP Publishing ; 2015
    In:  Applied Physics Letters Vol. 107, No. 21 ( 2015-11-23)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 107, No. 21 ( 2015-11-23)
    Abstract: The dynamic process of oxygen vacancy migration driven by the external electric field is directly observed at atomic scale in the cerium oxides (CeO2) thin film by in-situ transmission electron microscopy method. When a bias voltage of a proper value is applied across the CeO2 film, the oxygen vacancies are formed near the interface of CeO2/anode, followed by their migration along the direction of the external electric field. The structural modulation occurs in the [110] zone axis due to the ordering of oxygen vacancies. The migration of oxygen vacancies results in the reversible structural transformation, i.e., releasing and storing oxygen processes in CeO2, which is of great significance for the ionic and electronic applications of the cerium oxides materials, such as oxygen pump, gas sensor, resistive random access memory, etc.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4936333
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 7
    Online Resource
    Online Resource
    Dynamic nanomechanics of zinc oxide nanowires
    AIP Publishing ; 2012
    In:  Applied Physics Letters Vol. 100, No. 16 ( 2012-04-16)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 100, No. 16 ( 2012-04-16)
    Abstract: The electromechanical resonances of individual zinc oxide nanowires were induced by alternative current (ac) signals inside a transmission electron micrcrope, which have been used to measure the mechanical quality factors (Q) and elastic bending moduli (E) of a single zinc oxide (ZnO) nanowire. The resonance amplitudes were tuned by the applied ac voltages. The results indicate that Q drops as much as ∼80% with increasing resonance amplitudes, while E slightly decreases (∼3%). The mechanism of the amplitude-dependent mechanical properties is discussed. This study on dynamic nanomechanics of ZnO nanowires is significant for their cantilever-based applications.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4704919
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 8
    Online Resource
    Online Resource
    Electromagnetic effect on geodesic acoustic mode with adiabatic electrons
    AIP Publishing ; 2019
    In:  Physics of Plasmas Vol. 26, No. 2 ( 2019-02-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 26, No. 2 ( 2019-02-01)
    Abstract: The geodesic acoustic mode (GAM) is analytically investigated by taking into account the finite-orbit-width (FOW) resonance effect to the second order and the finite β effect. The general dispersion relation is derived from the gyro-kinetic equations in the presence of nonzero δA∥, the parallel component of the perturbed magnetic vector potential. Transparent and concise expressions for the GAM frequency and Landau damping rate in the presence of the second order FOW effect and finite β effect are first presented. It is clearly shown that the m = ±2 harmonics dominant δA∥ and the kinetic expression of δA∥ have the same form as the fluid one. For the real frequency, the electromagnetic effect introduces a term on the order of q2β, which is comparable to the second order electrostatic terms, namely, the terms introduced by the second order FOW resonance effect. While for the collisionless damping rate, δA∥ does not directly introduce β–dependent terms, but affects the damping rate via modifying the real frequency. Besides, our analytical result shows good agreement with the numerical examinations.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.5080271
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 1472746-8
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  • 9
    Online Resource
    Online Resource
    Nanowire field-effect transistor with Bi1.5Zn1.0Nb1.5O7 dielectric
    AIP Publishing ; 2008
    In:  Applied Physics Letters Vol. 93, No. 21 ( 2008-11-24)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 93, No. 21 ( 2008-11-24)
    Abstract: In this letter, amorphous Bi1.5Zn1.0Nb1.5O7 films with large permittivity (∼70) are prepared as the gate dielectric for ZnO nanowire field-effect transistors by using low-temperature (∼100°C) pulsed laser deposition. The transistors exhibit a low operation gate voltage ( & lt;3V), a high carrier mobility (∼42cm2∕Vs), and a steep subthreshold swing up to 240mV/decade. These results combined with near-room-temperature processing technique suggest that the nanowire transistor with Bi1.5Zn1.0Nb1.5O7 dielectric is a promising candidate for high-performance flexible electronics.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3037219
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 10
    Online Resource
    Online Resource
    Exact and asymptotic solutions to magnetohydrodynamic flow over a nonlinear stretching sheet with a power-law velocity by the homotopy renormalization method
    AIP Publishing ; 2019
    In:  Physics of Fluids Vol. 31, No. 6 ( 2019-06-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 31, No. 6 ( 2019-06-01)
    Abstract: We apply an asymptotic analysis to a nonlinear magnetohydrodynamic boundary-layer flow over a nonlinear stretching sheet with two types of boundary conditions: slip and no-slip. The original partial differential equations governing the flow regime are first transformed into a nonlinear ordinary equation by using a special type of similarity transformation. Asymptotic solutions are then obtained in simple explicit form via the homotopy renormalization method. These solutions satisfy the boundary conditions, and, for special values of the parameters, the asymptotic solutions are just the exact solutions. In addition, the impacts of the magnetic energy effect, the electrical conductivity, and the slip boundary are shown graphically. The validity of the asymptotic solutions is evaluated by comparison with numerical solutions. The results show that the explicit solutions, with finite numbers of terms, perform very well over the whole domain, indicating that our solutions are almost exact.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/1.5100305
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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