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  • 1
    Online Resource
    Online Resource
    Stacking- and strain-dependent magnetism in Janus CrSTe bilayer
    AIP Publishing ; 2023
    In:  Applied Physics Letters Vol. 122, No. 12 ( 2023-03-20)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 122, No. 12 ( 2023-03-20)
    Abstract: Stacking order and strain are the key component in tuning magnetic property of two-dimensional (2D) van der Waals magnetic materials. In this work, we investigated the crystal structure stability of a 2D ferromagnetic Janus chromium dichalcogenide CrSTe bilayer in AB- and AC-stacking orders and found that AB-stacking CrSTe bilayers, which have a smaller layer spacing and a Curie temperature near room temperature, are more stable than AC-stacking one. The magnetic ground states, exchange coupling constant, and Curie temperature of the AB-stacking CrSTe bilayer can be tuned by strain. It is found that the magnetic ground states of the AB- and AC-stacking CrSTe bilayers are ferromagnetic and interlayer antiferromagnetic within a certain strain range, respectively, indicating that the CrSTe bilayers are expected to be used in the double spin filter. Our results demonstrated that the 2D Janus CrSTe bilayer has the potential in the application of spintronic devices with stable performance and low-power consumption at room temperature.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0144653
    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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  • 2
    Online Resource
    Online Resource
    Magnetic properties manipulation of CrTe2 bilayer through strain and self-intercalation
    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: Two-dimensional van der Waals magnetic crystals have been attracting significant research interest in recent years, and the manipulation of their magnetism is important for understanding their physical property and achieving their actual applications. Here, we systematically studied the manipulation of magnetic properties of a CrTe2 bilayer through in-plane strain and self-intercalation. We found that the magnetic ground state of the CrTe2 bilayer varies from intralayer antiferromagnetic coupling to ferromagnetic coupling and then to interlayer antiferromagnetic coupling when the strain changes from −6% to 4%, which should result from the coupling between intralayer Cr atoms tuned from direct Cr–Cr exchange to indirect Cr–Te–Cr superexchange. The magnetic easy axis of the CrTe2 bilayer varies from the in-plane to the out-of-plane owing to the change of pz orbital occupation from Te atoms near the Fermi level. Moreover, the magnetic ground states of different Cr-intercalated concentrations for the CrTe2 bilayer are all ferromagnetic, and the magnetic easy axis is in-plane, which are different from the intrinsic one. Our results indicate that the magnetic property of the CrTe2 bilayer is sensitive to the in-plane strain and self-intercalation, which provides important guidance for the further magnetic manipulation of the CrTe2 bilayer in theoretical research and application of magnetic strain sensors and spin transistors.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0068018
    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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  • 3
    Online Resource
    Online Resource
    Exceptionally high hole mobilities in monolayer group-IV monochalcogenides GeTe and SnTe
    AIP Publishing ; 2023
    In:  Applied Physics Letters Vol. 123, No. 1 ( 2023-07-03)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 123, No. 1 ( 2023-07-03)
    Abstract: Two-dimensional semiconductors are considered as promising channel materials for next-generation nanoelectronics devices, while their practical applications are typically limited by their low mobilities. In this work, using first-principles calculations combined with the Boltzmann transport formalism involving electron–phonon coupling, we study the transport properties of monolayer group-IV monochalcogenides (MX, M = Ge, Sn; X = S, Se, and Te). We find that the GeTe and SnTe possess exceptionally high hole mobilities, which even reach 835 and 1383 cm2/V s, respectively, at room temperature. More interestingly, the hole mobilities increase with the increase in the atomic number of “X” in MXs when “M” remains the same. Such a trend is mainly due to the increased group velocity and decreased density of states, and the latter plays a significant role in determining the carrier scattering space and relaxation time. Meanwhile, different from the acoustic deformation potential theory, we find that the high-energy optical phonons contribute a lot to the scattering. Our work shows that the monolayer GeTe and SnTe are promising p-type semiconductors in nanoelectronics and reveals the intrinsic connection between phonons, charge density of states, and mobility, which would shed light on exploring the two-dimensional materials with high mobility.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0142613
    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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  • 4
    Online Resource
    Online Resource
    Estimations of Mo X-pinch plasma parameters on QiangGuang-1 facility by L-shell spectral analyses
    AIP Publishing ; 2013
    In:  Physics of Plasmas Vol. 20, No. 8 ( 2013-08-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 20, No. 8 ( 2013-08-01)
    Abstract: Plasma parameters of molybdenum (Mo) X-pinches on the 1-MA QiangGuang-1 facility were estimated by L-shell spectral analysis. X-ray radiation from X-pinches had a pulsed width of 1 ns, and its spectra in 2–3 keV were measured with a time-integrated X-ray spectrometer. Relative intensities of spectral features were derived by correcting for the spectral sensitivity of the spectrometer. With an open source, atomic code FAC (flexible atomic code), ion structures, and various atomic radiative-collisional rates for O-, F-, Ne-, Na-, Mg-, and Al-like ionization stages were calculated, and synthetic spectra were constructed at given plasma parameters. By fitting the measured spectra with the modeled, Mo X-pinch plasmas on the QiangGuang-1 facility had an electron density of about 1021 cm−3 and the electron temperature of about 1.2 keV.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.4818901
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 1472746-8
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  • 5
    Online Resource
    Online Resource
    Critical current and flux pinning near T c of a YBa2Cu3O7 thin film
    AIP Publishing ; 1991
    In:  Journal of Applied Physics Vol. 70, No. 4 ( 1991-08-15), p. 2461-2463
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 70, No. 4 ( 1991-08-15), p. 2461-2463
    Abstract: The voltage V versus current I of a high-quality YBa2Cu3O7−x thin film with zero-resistance temperature equal to 90.8 K was measured at temperatures near Tc (85, 87, and 90 K, respectively) under different magnetic fields (0–7 T). A significant result is that the critical-current density of the film reached 1.37×104 A/cm2 (zero field) even at 90 K, implying that strong pinning centers exist in our sample. However, a small applied magnetic field will diminish the critical-current densities remarkably. The pinning-force densities are found to follow Kramer’s scaling law in both perpendicular and parallel directions of the magnetic fields to the c axis of the film. A possible influence of thermally activated flux creep on the pinning mechanism is confirmed.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.349400
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1991
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 6
    Online Resource
    Online Resource
    The effects of pulse voltage rise time on the nanosecond pulsed breakdown of nitrogen spark switch at atmospheric pressure with 3D PIC-MCC model
    AIP Publishing ; 2023
    In:  Physics of Plasmas Vol. 30, No. 4 ( 2023-04-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 30, No. 4 ( 2023-04-01)
    Abstract: In this paper, the effects of pulse voltage rise time on the nanosecond pulsed breakdown of the nitrogen spark switch at atmospheric pressure are analyzed. Based on the assumption of initial electrons generation due to the field emission, the simulations are performed using a three-dimensional particle-in-cell, Monte Carlo-collision model for the pulse voltage with a rise time of 40, 60, and 100 ns, respectively. The breakdown experiments of the nitrogen spark switch are carried out for three different rise times. The results obtained are as follows. First, the nanosecond pulsed breakdown of the switch includes the formation and fast propagation of the streamer, which depend on the multiplication of the electron avalanche, and the intense ionization due to photoelectrons and energetic electrons, respectively. Second, with the rise time of pulse voltage increasing, the generation of runaway electrons becomes more difficult and the streamer branches, which are mainly caused by photoionization and captured energetic electrons, become more obvious. Finally, the breakdown time delay of the switch becomes shorter and the breakdown voltage becomes higher at the same pressure for the decreasing rise time of pulse voltage, which is consistent with the measurement results.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/5.0138011
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1472746-8
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  • 7
    Online Resource
    Online Resource
    Scalable selective absorber with quasiperiodic nanostructure for low-grade solar energy harvesting
    AIP Publishing ; 2023
    In:  APL Photonics Vol. 8, No. 2 ( 2023-02-01)
    Details
    In: APL Photonics, AIP Publishing, Vol. 8, No. 2 ( 2023-02-01)
    Abstract: Although the solar-thermal technology has opened up a potential green energy harvesting method, it is challenging to suppress the non-negligible energy dissipation while maintaining a high absorbance. Most disordered organic polymers are almost incapable of limiting the absorption in the desired cutoff wavelength range, which is detrimental to the design of selective absorbers. Moreover, the development of absorbers with a periodic plasmonic nanostructure is always lacking in cost-effective scalability. Herein, we report a scalable selective absorber with a quasiperiodic nanostructure composed by an economical widespread surface self-assembly of densely arranged Fe3O4 nano-particles, possessing a high-performance energy conversion for low-grade solar energy. By investigating the scale effect of the quasiperiodic densely arranged plasmonic nanostructure, a significant solar absorption & gt;94% and ideal passive suppression of thermal emissivity & lt;0.2 can be obtained simultaneously. With the synergy of material properties, thermal management, and environmental effect, a flexible planar solar thermoelectric harvester is demonstrated under natural sunlight (AM1.5G), reaching a significant sustaining open-circuit voltage of & gt;20 mV/cm2, without a heat sink. This highly versatile strategy is expected to lead the exploration of energy evolution in fundamental research and pioneer next-generation, high-performance, economical, and practical solar co-harvesting systems.
    Type of Medium: Online Resource
    ISSN: 2378-0967
    URL: Article
    DOI: 10.1063/5.0135193
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2857268-3
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  • 8
    Online Resource
    Online Resource
    Effect of length and size of heterojunction on the transport properties of carbon-nanotube devices
    AIP Publishing ; 2007
    In:  Applied Physics Letters Vol. 91, No. 13 ( 2007-09-24)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 91, No. 13 ( 2007-09-24)
    Abstract: By applying nonequilibrium Green’s functions in combination with the density-functional theory, we investigate the electronic transport properties of molecular junctions constructed by the mirror symmetrical straight carbon-nanotube heterojunctions. The results show that the length and size of heterojunction play an important role in the electronic transport properties of these systems. The negative differential resistance behavior can be observed in such devices with certain length and size of heterojunction. A mechanism is suggested for the negative differential resistance behavior.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2790839
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 9
    Online Resource
    Online Resource
    Experimental analysis for the effect of dynamic capillarity on stress transformation in porous silicon
    AIP Publishing ; 2008
    In:  Applied Physics Letters Vol. 92, No. 4 ( 2008-01-28)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 92, No. 4 ( 2008-01-28)
    Abstract: The evolution of real-time stress in porous silicon (PS) during drying is investigated using micro-Raman spectroscopy. The results show that the PS sample underwent non-negligible stress when immersed in liquid and suffered a stress impulsion during drying. Such nonlinear transformation and nonhomogeneneous distribution of stress are regarded as the coupling effects of several physical phenomena attributable to the intricate topological structure of PS. The effect of dynamic capillarity can induce microcracks and even collapse in PS structures during manufacture and storage.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2838716
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 211245-0
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  • 10
    Online Resource
    Online Resource
    Effect of intertube interaction on the transport properties of a carbon double-nanotube device
    AIP Publishing ; 2007
    In:  Journal of Applied Physics Vol. 101, No. 6 ( 2007-03-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 101, No. 6 ( 2007-03-15)
    Abstract: By applying nonequilibrium Green’s functions and first-principles calculations, we investigate the transport behaviors of the bitube device with two single-walled nanotubes attached to metal electrodes. The results show that the intertube interactions play an important role in the conducting behavior of these systems. By adjusting the intertube distance and the orientational order, namely changing the magnitude of the intertube interactions, a different transport behavior can be observed in the system.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.2714780
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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