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  • Online Resource  (33)
  • AIP Publishing  (33)
  • Li, Jie  (33)
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  • AIP Publishing  (33)
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  • 1
    Online Resource
    Online Resource
    Measurement of yield and spectrum of secondary electron emission and their characteristics under modification of conductive materials
    AIP Publishing ; 2019
    In:  Review of Scientific Instruments Vol. 90, No. 6 ( 2019-06-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 90, No. 6 ( 2019-06-01)
    Abstract: Surface modification technique of secondary electron emission (SEE) characteristics of materials, which is utilized to suppress or promote the SEE from material surface under electron bombardment, has extensive applications in a variety of fields. Measurement of the secondary electron yield (SEY) and the secondary electron spectrum (SES) before and after surface modification is essential for the evaluation of effectiveness and the investigation of mechanism of material modification. A SEY and SES measurement system is reported in this article. The comparative measurements of the total SEY, the true SEY, the backscattered electron yield, and the SES of nickel and free-standing vertical graphene, which was grown in situ on the surface of nickel substrate by plasma enhanced chemical vapor deposition, were performed using this system. The measurement results demonstrate that this system could facilitate the study of surface modification on the SEE characteristics of conductive materials.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.5053965
    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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  • 2
    Online Resource
    Online Resource
    Design of a beam line for simultaneous dual-beam ion implantation
    AIP Publishing ; 2023
    In:  AIP Advances Vol. 13, No. 7 ( 2023-07-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 13, No. 7 ( 2023-07-01)
    Abstract: For over 50 years, various ion beam facilities have been utilized to simulate the irradiation effect of neutrons on relevant nuclear materials. However, due to the limitation of single ion beam irradiation, the injection of H2+ and He+ into the sample coaxially is necessary to observe the synergy of hydrogen and helium displacement damage. This study presents a beam line design that is capable of separating ions with different charge mass ratios, screening out unwanted particles, and finally combining the separated beams again. Through this design, H+, H2+, and He+ beams can be completely separated with an axis deviation of less than 0.5 mm after beam combination. Furthermore, the proportion of H2+ and He+ can be adjusted by regulating the inlet air of the ion source, down to the accuracy of a single ion. An accelerating tube is employed to adjust the energy of implanted ions within 10–50 keV. This device also has the capability to efficiently transmit a single type of ion while filtering out extraneous ions (such as O+ beam). The fine-beam optical design not only makes it easy to adjust beam parameters but also eliminates the need for a high-precision power supply. The goal of this work is to have an analytical tool to understand the effect of each electromagnetic component on the ion trajectories.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/5.0144431
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2583909-3
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  • 3
    Online Resource
    Online Resource
    Thermodynamic stability and kinetic foldability of a lattice protein model
    AIP Publishing ; 2004
    In:  The Journal of Chemical Physics Vol. 120, No. 13 ( 2004-04-01), p. 6274-6287
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 120, No. 13 ( 2004-04-01), p. 6274-6287
    Abstract: By using serial mutations, i.e., a residue replaced by 19 kinds of naturally occurring residues, the stability of native conformation and folding behavior of mutated sequences are studied. The 3×3×3 lattice protein model with two kinds of interaction potentials between the residues, namely the original Miyazawa and Jernigan (MJ) potentials and the modified MJ potentials (MMJ), is used. Effects of various sites in the mutated sequences on the stability and foldability are characterized through the Z-score and the folding time. It is found that the sites can be divided into three types, namely the hydrophobic-type (H-type), the hydrophilic-type (P-type) and the neutral-type (N-type). These three types of sites relate to the hydrophobic core, the hydrophilic surface and the parts between them. The stability of the native conformation for the serial mutated sequences increases (or decreases) as the increasing in the hydrophobicity of the mutated residues for the H-type sites (or the P-type sites), while varies randomly for the N-type sites. However, the foldability of the mutated sequences is not always consistent with the thermodynamic stability, and their relationship depends on the site types. Since the hydrophobic tendency of the MJ potentials is strong, the ratio between the number of the H-type sites and the number of the P-type sites is found to be 1:2. Differently, for the MJJ potentials it is found that such a ratio is about 1:1 which is relevant to that of real proteins. This suggests that the modification of the MJ potentials is rational in the aspect of thermodynamic stability. The folding of model proteins with the MMJ potentials is fast. However, the relationship between the foldability and the thermodynamic stability of the mutated sequences is complex.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.1651053
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2004
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 4
    Online Resource
    Online Resource
    Strongly coupled van der Waals heterostructures for high-performance infrared phototransistor
    AIP Publishing ; 2019
    In:  Applied Physics Letters Vol. 114, No. 10 ( 2019-03-11)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 114, No. 10 ( 2019-03-11)
    Abstract: The interfacial coupling in van der Waals (vdWs) heterostructures can effectively modulate the device performance. In this study, we demonstrate a high performance infrared detector fabricated by direct epitaxial growth of Te nanowires onto a MoS2 monolayer. Such directly grown Te/MoS2 heterostructures show much stronger interfacial coupling than artificially transferred Te/MoS2 hybrids, as evidenced from their Raman and photoluminescence spectra. The strong vdWs interfacial coupling leads to a high performance infrared detector with both ultrahigh photoresponsivity ( & gt;103 A/W) and rapid response time (τrising = 15 ms) at the telecommunication wavelength of 1550 nm. The anti-bipolar and rectification behaviors observed in the strongly coupled grown Te-MoS2 heterojunction further confirm the effective interfacial coupling. In contrast, the weakly coupled transferred Te-MoS2 heterojunction that is obtained by artificial transfer exhibits negligible anti-bipolar behavior and slight rectification behavior. These findings indicate that the coupled vdWs hybrid structures have great potential for achieving high performance photodetectors.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5083685
    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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  • 5
    Online Resource
    Online Resource
    Multifunctional tunneling devices based on graphene/ h -BN/MoSe2 van der Waals heterostructures
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 110, No. 17 ( 2017-04-24)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 110, No. 17 ( 2017-04-24)
    Abstract: The vertically stacked devices based on van der Waals heterostructures (vdWHs) of two-dimensional layered materials (2DLMs) have attracted considerable attention due to their superb properties. As a typical structure, graphene/hexagonal boron nitride (h-BN)/graphene vdWH has been proved possible to make tunneling devices. Compared with graphene, transition metal dichalcogenides possess intrinsic bandgap, leading to high performance of electronic devices. Here, tunneling devices based on graphene/h-BN/MoSe2 vdWHs are designed for multiple functions. On the one hand, the device shows a typical tunneling field-effect transistor behavior. A high on/off ratio of tunneling current (5 × 103) and an ultrahigh current rectification ratio (7 × 105) are achieved, which are attributed to relatively small electronic affinity of MoSe2 and optimized thickness of h-BN. On the other hand, the same structure also realizes 2D non-volatile memory with a high program/erase current ratio ( & gt;105), large memory window (∼150 V from ±90 V), and good retention characteristic. These results could enhance the fundamental understanding of tunneling behavior in vdWHs and contribute to the design of ultrathin rectifiers and memory based on 2DLMs.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4982691
    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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  • 6
    Online Resource
    Online Resource
    Ferroelectric-induced carrier modulation for ambipolar transition metal dichalcogenide transistors
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 110, No. 12 ( 2017-03-20)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 110, No. 12 ( 2017-03-20)
    Abstract: For multifarious electronic and optoelectronic applications, it is indispensable exploration of stable and simple method to modulate electrical behavior of transition metal dichalcogenides (TMDs). In this study, an effective method to adjust the electrical properties of ambipolar TMDs is developed by introducing the dipole electric field from poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) ferroelectric polymer. The transition from ambipolar to p-type conductive characteristics is realized, and the transistor performances are also significantly enhanced. Hole density of MoTe2- and WSe2-based back-gate field effect transistors increases by 4.4 and 2.5 times. Moreover, the corresponding hole mobilities are strikingly improved from 0.27 to 10.7 cm2 V−1 s−1 and from 1.6 to 59.8 cm2 V−1 s−1, respectively. After optimizing, p-channel MoTe2 phototransistors present ultrahigh responsivity of 3521 A/W, which is superior to most layered phototransistors. The remarkable control of conductive type, carrier concentration, and field-effect mobility of ambipolar TMDs via P(VDF-TrFE) treatment paves a way for realization of high-performance and versatile electronic and optoelectronic devices.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4979088
    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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  • 7
    Online Resource
    Online Resource
    Oriented layered Bi2O2Se nanowire arrays for ultrasensitive photodetectors
    AIP Publishing ; 2019
    In:  Applied Physics Letters Vol. 114, No. 15 ( 2019-04-15)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 114, No. 15 ( 2019-04-15)
    Abstract: Due to its high carrier mobility, superior air stability, and intriguing self-modulation doping effects, Bi2O2Se has shown great potential for applications in high performance field-effect transistors and infrared photodetectors. However, Bi2O2Se generally tends to form 2D micromorphology because of its native layered structure. Here, we developed a space-confined CVD method to realize the epitaxial growth of highly oriented 1D Bi2O2Se arrays. The controllable length and width of the vertical growth nanowires mainly distribute in the ranges of 30–42 μm and 120–160 nm, respectively. The orientation of Bi2O2Se nanowires was determined by the epitaxial relationship between Bi2O2Se {110} and mica {00n} planes. In addition, various morphologies of Bi2O2Se including 1D nanowires, 2D nanosheets, and rectangular nanosheets can be controllably synthesized by precisely modifying the growth temperature. The integrated detector based on the as-synthesized Bi2O2Se nanowire arrays demonstrated excellent performances in the spectrum from the UV to near-infrared regime. The responsivity, detectivity, external quantum efficiency, and response time can reach up to 722.2 A W−1, 5.64 × 1011 Jones, 189 000%, and 0.267 ms, respectively. These findings manifest that the oriented Bi2O2Se nanowire arrays have great prospects in ultrafast and near-infrared photodetection applications.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5094192
    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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  • 8
    Online Resource
    Online Resource
    Study of solar irradiation distribution in narrow channel of desiccant rotor
    AIP Publishing ; 2019
    In:  AIP Advances Vol. 9, No. 7 ( 2019-07-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 9, No. 7 ( 2019-07-01)
    Abstract: The objective of this paper is to present experimental results on distribution characteristics of solar irradiation absorbed by the narrow channel wall of desiccant rotor. Experiments are performed with the channel made by the silica gel and the poly propylene (PP). Energy absorption rate is measured in conditions of different channel lengths, incident irradiation angles, air temperatures, and humidity. The result of the present measurement for silica gel is equal to that of the previous study [J. Li, Y. Hamamoto, and H. Mori, Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers 32(2), 149–154 (2015)], which is conducted using laser light as a source. It is confirmed the previous prediction model of laser light is suitable for this solar light system. Moreover, the previous model is improved, because the rate of laser for PP is larger than that of solar. These models are applicable to predict desorption rate of the water vapor in a desiccant rotor heated directly by the concentrated solar irradiation. The results show that the absorption rates of solar irradiation and red laser are equal to each other in the silica gel channel. The absorption rates of the laser irradiation are larger than that of the solar irradiation for PP materials. It is clear that the solar irradiation absorption rate cannot be influenced by the ambient humidity and temperature. The prediction model of the absorption efficiency based on the laser for silica gel channel can reproduce well the absorption efficiency of experiment based on solar irradiation. In the case of PP, the difference between the prediction and the measurement is observed.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5100879
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2583909-3
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  • 9
    Online Resource
    Online Resource
    Spectral amplitude modulation and dynamic near-field displaying of all-silicon terahertz metasurfaces supporting bound states in the continuum
    AIP Publishing ; 2021
    In:  Applied Physics Letters Vol. 119, No. 24 ( 2021-12-13)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 119, No. 24 ( 2021-12-13)
    Abstract: The bound states in a continuum (BICs) are objective physical phenomena that defy conventional wisdom, and they exist in the radiating continuous spectrum but remain perfectly localized with non-radiation, which is different from the traditional bound states. In this paper, we report in theory and experiment the high thickness all-silicon terahertz (THz) metasurfaces supporting BIC and quasi-BIC, which is realized by simple pairs of elliptical pillars. Meanwhile, we used an extra optical pump to modulate the transmission amplitude difference between BIC and quasi-BIC metasurfaces, to complete the active control from “On” state to “Off” state. We utilize the abundant amplitude gradation of metasurfaces with different asymmetric degrees to develop the polarization-dependent THz near-field displaying application that can make the grayscale characteristics of a photograph reappear and also be dynamically controlled at On state to Off state.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0067937
    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
    An integrated high-flux cold atomic beam source for strontium
    AIP Publishing ; 2023
    In:  Review of Scientific Instruments Vol. 94, No. 9 ( 2023-09-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 94, No. 9 ( 2023-09-01)
    Abstract: We present the design, construction, and characterization of an integrated cold atomic beam source for strontium (Sr), which is based on a compact Zeeman slower for slowing the thermal atomic beam and an atomic deflector for selecting the cold flux. By adopting arrays of permanent magnets to produce the magnetic fields of the slower and the deflector, we effectively reduce the system size and power compared to traditional systems with magnetic coils. After the slower cooling, one can employ additional transverse cooling in the radial direction and improve the atom collimation. The atomic deflectors employ two stages of two-dimensional magnetic-optical trapping (MOT) to deflect the cold flux, whose atomic speed is lower than 50 m/s, by 20° from the thermal atomic beam. We characterize the cold atomic beam flux of the source by measuring the loading rate of a three-dimensional MOT. The loading rates reach up to 109 atoms/s. The setup is compact, highly tunable, lightweight, and requires low electrical power, which addresses the challenge of reducing the complexity of building optical atomic clocks and quantum simulation devices based on Sr.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/5.0162128
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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