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  • AIP Publishing  (124)
  • 2020-2024  (124)
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  • AIP Publishing  (124)
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  • 2020-2024  (124)
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  • 1
    Online Resource
    Online Resource
    Design of a compact short pulse positron source based on laser plasma accelerators
    AIP Publishing ; 2020
    In:  Physics of Plasmas Vol. 27, No. 10 ( 2020-10-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 27, No. 10 ( 2020-10-01)
    Abstract: Compact short pulse positron source in the energy range of a few tens of MeV driven by laser plasma accelerator is a promising tool for many applications, such as materials science and source of colliders. A collection and transmission system based on laser plasma accelerators is proposed to intensify and narrow the beam divergence for positrons generated from converters. The system is composed of a converter, a collimator, a solenoid, quadrupoles, and a slit in the exit. Numerical simulations were performed to demonstrate the feasibility and robustness of the design. The designed system can work in the center energy range from 15 to 40 MeV within ±10% energy spread (FWHM) and greatly improve the quality of collected positron beams with a divergence of around 50 mrad.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/5.0021136
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 1472746-8
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  • 2
    Online Resource
    Online Resource
    Direct observation of spin polarization in epitaxial Fe3O4(001)/MgO thin films grown by magnetron sputtering
    AIP Publishing ; 2022
    In:  Applied Physics Letters Vol. 120, No. 18 ( 2022-05-02)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 120, No. 18 ( 2022-05-02)
    Abstract: We obtained epitaxial single-crystal Fe3O4(001)/MgO(001) thin films by magnetron sputtering. The high quality of the grown Fe3O4 films was confirmed by reflection high-energy electron diffraction and x-ray photoelectron spectroscopy. Atomic magnetic properties of Fe3O4(001)/MgO(001) were investigated using vibrating sample magnetometry and x-ray magnetic circular dichroism. The values of saturation magnetization and magnetic moment are 407 ± 5 emu/cm3 (3.26 ± 0.04 μB/(f.u.)) and 3.31 ± 0.15 μB/(f.u.), respectively, in the Fe3O4 film as thin as 5 nm, which are close to the bulk values. The spin polarization was directly measured using spin-resolved photoemission spectroscopy. The measured spin polarization has a maximum value of −42% ± 3%, which is comparable to the theoretical value for the (2 × 2)R45° reconstructed Fe3O4(001) surface. Furthermore, the film thickness-dependent measurements indicate that the anti-phase boundaries significantly decrease the spin polarization rather than the lattice mismatch. Our results demonstrate that epitaxial Fe3O4(001)/MgO thin films grown by magnetron sputtering have desired magnetic properties, facilitating the potential application of Fe3O4-based spintronic devices.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0091241
    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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  • 3
    Online Resource
    Online Resource
    Prediction of Ti-Zr-Nb-Ta high-entropy alloys with desirable hardness by combining machine learning and experimental data
    AIP Publishing ; 2021
    In:  Applied Physics Letters Vol. 119, No. 20 ( 2021-11-15)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 119, No. 20 ( 2021-11-15)
    Abstract: Traditional alloy design depends heavily on “trial and error” experiments, which are neither cost-effective nor efficient, particularly for the development of high-entropy alloys (HEAs) using a broad composition space. Herein, we combine a machine learning (ML) model with phase diagram calculations (CALPHAD) to design Ti-Zr-Nb-Ta refractory HEAs with a desirable hardness. The extreme gradient boosting (XGBoost) algorithm is used to train the ML model based on the Ti-Zr-Nb-Ta HEA hardness dataset from CALPHAD-assisted experiments. As a result, the most important features (i.e., the Ta content, melting point, and entropy of mixing) are determined via feature selection and model optimization. Moreover, the high performance of the ML model is validated experimentally, and the prediction accuracy reaches 97.8%. This work provides not only an interpretable ML model that can be used to predict the hardness of Ti-Zr-Nb-Ta HEAs but also feasible guidance for the development of HEAs with desirable hardness.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0065303
    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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  • 4
    Online Resource
    Online Resource
    Realizing single-mode lasing of cadmium selenide nanoribbons with strain engineering
    AIP Publishing ; 2020
    In:  Applied Physics Letters Vol. 116, No. 19 ( 2020-05-11)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 116, No. 19 ( 2020-05-11)
    Abstract: Semiconductor nanowires/nanoribbons have great potential in nanoscale lasers because of their intrinsic laser capabilities and excellent optoelectronic properties. However, these as-grown nanostructures, lacking precise structural controllability, usually show multimode lasing, which hinders their applications in on-chip functional optoelectronic devices. In this work, by using a home-made strain apparatus, we obtained out-of-plane buckled cadmium selenide nanoribbons, resulting in a single-mode lasing at the curved part of the nanoribbons. Taking into consideration the bending structure of nanoribbons, we speculate that deformation-induced light confinement and strain-driven carrier's redistribution contributed mainly to the single-mode lasing. Moreover, a periodic out-of-plane bending of nanoribbons is realized by thermal controlling deformation of the elastic substrate and cadmium selenide, in which single-mode lasing at each crest part can be obtained. Our work opened an alternative avenue to realize nanoscale single-mode lasers, which was quite useful for flexible optoelectronic devices.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0004749
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 5
    Online Resource
    Online Resource
    Isotropic spin polarization in Heusler Co2FeAl thin films
    AIP Publishing ; 2022
    In:  AIP Advances Vol. 12, No. 2 ( 2022-02-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 12, No. 2 ( 2022-02-01)
    Abstract: Spin polarization and the Gilbert damping, as the two key parameters of the magnetic materials for spintronic applications, were suggested to be inversely proportional to each other in a series of Heusler alloys. Recently, large anisotropic Gilbert damping was found in Co2FeAl thin films, implying that spin polarization may be also anisotropic. Here, we report an isotropic spin polarization with a constant value of 60% in a 20-nm Co2FeAl thin film with a B2 structure, using spin- and angle-resolved photoemission spectroscopy and time-resolved magneto-optical Kerr effect. Furthermore, this result was also supported by the ab initio calculations that the difference of the spin polarization between all the orientations is less than 1% for the Co2FeAl thin film. This finding provides profound insight into the spin polarization in Co2FeAl alloys.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/5.0076246
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2583909-3
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  • 6
    Online Resource
    Online Resource
    Ferromagnetism in two-dimensional CrTe2 epitaxial films down to a few atomic layers
    AIP Publishing ; 2021
    In:  AIP Advances Vol. 11, No. 3 ( 2021-03-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 11, No. 3 ( 2021-03-01)
    Abstract: Two-dimensional (2D) van der Waals ferromagnetic materials have attracted intense attention due to their potential impact on both fundamental and applied research studies. Recently, a new 2D ferromagnet CrTe2, prepared by mechanical exfoliation or chemical vapor deposition, has gained interest due to its novel magnetic properties. In this work, high quality CrTe2 epitaxial thin films were prepared on GaAs (111)B substrates using solid source molecular beam epitaxy, with the thickness varying from 35 to 4 monolayers (MLs). The magnetic easy axis of all the films is oriented along the c-axis. A Curie temperature of 205 K is found in the 35 ML CrTe2 film, measured by the temperature-dependent anomalous Hall resistance (RAHE). Importantly, even when the film thickness decreases to 4 MLs, a robust out-of-plane ferromagnetism with a Curie temperature of 191 K has been demonstrated. This finding could pave the way for investigating the fundamental studies in 2D ferromagnetism and has great significance in device applications.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/5.0041531
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2583909-3
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  • 7
    Online Resource
    Online Resource
    Kinematic responses of an autorotating samara to concentrated crosswind
    AIP Publishing ; 2022
    In:  Physics of Fluids Vol. 34, No. 11 ( 2022-11-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 34, No. 11 ( 2022-11-01)
    Abstract: A single-winged maple seed (samara) is dispersed laterally by a crosswind in contrast to simply descending straight down (zero dispersion) in quiescent air. This article presents the general kinematic response of a particular type of samaras (Acer buergerianum) in stable autorotation to the disturbance of a concentrated crosswind (simulated via slot jet) with the crosswind strength varied distinctively from weak to strong. A relatively weak crosswind slower than the tip velocity of the stably autorotating samara causes only damped undulations of its descent trajectory. In contrast, we demonstrate that the samara exhibits a bi-modal response when disturbed by a relatively strong crosswind (velocity greater than samara tip velocity). The strong crosswind enables the samara either to float laterally with the crosswind or drop-out through the crosswind with the switching of its rotational direction. Regardless of crosswind strength, stable autorotation is re-established after the samara leaves the crosswind zone, albeit accompanied by large-scale undulations in its descent trajectory. More importantly, before landing, the samara regains its original terminal descent velocity achieved in quiescent air.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/5.0125421
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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  • 8
    Online Resource
    Online Resource
    Modulation of edge defects on dual-spin filtering in zigzag β -SiC7 nanoribbons
    AIP Publishing ; 2023
    In:  The Journal of Chemical Physics Vol. 158, No. 20 ( 2023-05-28)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 158, No. 20 ( 2023-05-28)
    Abstract: The unique edge states of the zigzag β-SiC7 nanoribbons aroused our attention, and therefore, based on first-principles calculations, we investigated their spin-dependent electronic transport properties by constructing controllable defects to modulate these special edge states. Interestingly, by introducing rectangular edge defects in the SiSi and SiC edge-terminated systems, not only the spin-unpolarized is successfully converted to completely spin-polarized, but also the direction of polarization can be switched, thus enabling a dual spin filter. The analyses further reveal that the two transmission channels with opposite spins are spatially separated and that the transmission eigenstates are highly concentrated at the relative edges. The specific edge defect introduced only suppresses the transmission channel at the same edge but reserves the transmission channel at the other edge. In addition, for the CSi and CC edge-terminated systems, an additional spin-down band exists due to spin splitting in the spin-up band at EF, so that besides the original spatially separated two spin-opposite channels, an extra spin channel is distributed at the upper edge, resulting in unidirectional fully spin-polarized transport. The peculiar spatially separated edge states and excellent spin filtering properties could open up further possibilities for β-SiC7-based electronic devices in spintronics applications.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/5.0141343
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 9
    Online Resource
    Online Resource
    Stochastic equation of motion approach to fermionic dissipative dynamics. I. Formalism
    AIP Publishing ; 2020
    In:  The Journal of Chemical Physics Vol. 152, No. 20 ( 2020-05-29)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 152, No. 20 ( 2020-05-29)
    Abstract: In this work, we establish formally exact stochastic equation of motion (SEOM) theory to describe the dissipative dynamics of fermionic open systems. The construction of the SEOM is based on a stochastic decoupling of the dissipative interaction between the system and fermionic environment, and the influence of environmental fluctuations on the reduced system dynamics is characterized by stochastic Grassmann fields. Meanwhile, numerical realization of the time-dependent Grassmann fields has remained a long-standing challenge. To solve this problem, we propose a minimal auxiliary space (MAS) mapping scheme with which the stochastic Grassmann fields are represented by conventional c-number fields along with a set of pseudo-levels. This eventually leads to a numerically feasible MAS-SEOM method. The important properties of the MAS-SEOM are analyzed by making connection to the well-established time-dependent perturbation theory and the hierarchical equations of motion theory. The MAS-SEOM method provides a potentially promising approach for the accurate and efficient simulation of fermionic open systems at ultra-low temperatures.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.5142164
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 10
    Online Resource
    Online Resource
    Compact single fiber optical tweezer–micropipette system for completely noninvasive cell sorting
    AIP Publishing ; 2023
    In:  Applied Physics Letters Vol. 122, No. 23 ( 2023-06-05)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 122, No. 23 ( 2023-06-05)
    Abstract: Bridging optical tweezers and microfluidics can form a multifunctional platform, which can overcome the difficulties of precise manipulation in hydrodynamic flow in a noninvasive method. However, when integrated into a microfluidic chip, the fiber optic tweezer loses its flexibility. Here, we propose a compact single fiber optical tweezer–micropipette system. It can sort particles by differences in shape and refractive index in a completely noninvasive way while retaining the flexibility, high selectivity, and precision of a fiber optical tweezer. Compact microfluidic channels are formed by combining two different-diameter micropipettes. The internal diameter of the circular microfluidic channel is less than 30 μm. Furthermore, we calculated the trapping and pushing regions of Yeast and Chlorella and achieved the separation of Yeast from Chlorella in the experiments. We did 90 sets of tests on the sorting accuracy of single fiber optical tweezer (SFOT). SFOT was able to distinguish between two types of particles in each test. With the advantages of high selectivity, high accuracy, low optical power consumption, and compact structure, such methods can be used in the fields of optical separation, cell transportation, cell sorting, and single-cell analysis.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0139071
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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