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  • IOP Publishing  (66)
  • 2020-2024  (66)
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  • IOP Publishing  (66)
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  • 2020-2024  (66)
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  • 1
    Online-Ressource
    Online-Ressource
    Breakdown voltage enhancement in GaN channel and AlGaN channel HEMTs using large gate metal height*
    IOP Publishing ; 2020
    In:  Chinese Physics B Vol. 29, No. 2 ( 2020-02-01), p. 027301-
    Details
    In: Chinese Physics B, IOP Publishing, Vol. 29, No. 2 ( 2020-02-01), p. 027301-
    Kurzfassung: A large gate metal height technique is proposed to enhance breakdown voltage in GaN channel and AlGaN channel high-electron-mobility-transistors (HEMTs). For GaN channel HEMTs with gate–drain spacing L GD = 2.5 μm, the breakdown voltage V BR increases from 518 V to 582 V by increasing gate metal height h from 0.2 μm to 0.4 μm. For GaN channel HEMTs with L GD = 7 μm, V BR increases from 953 V to 1310 V by increasing h from 0.8 μm to 1.6 μm. The breakdown voltage enhancement results from the increase of the gate sidewall capacitance and depletion region extension. For Al 0.4 Ga 0.6 N channel HEMT with L GD = 7 μm, V BR increases from 1535 V to 1763 V by increasing h from 0.8 μm to 1.6 μm, resulting in a high average breakdown electric field of 2.51 MV/cm. Simulation and analysis indicate that the high gate metal height is an effective method to enhance breakdown voltage in GaN-based HEMTs, and this method can be utilized in all the lateral semiconductor devices.
    Materialart: Online-Ressource
    ISSN: 1674-1056
    URL: Article
    DOI: 10.1088/1674-1056/ab5fb9
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2020
    ZDB Id: 2412147-2
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Online-Ressource
    Open Access Wunsch
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    BTU Cottbus
  • 2
    Online-Ressource
    Online-Ressource
    Review on typical applications and computational optimizations based on semiclassical methods in strong-field physics
    IOP Publishing ; 2022
    In:  Chinese Physics B Vol. 31, No. 3 ( 2022-03-01), p. 033101-
    Details
    In: Chinese Physics B, IOP Publishing, Vol. 31, No. 3 ( 2022-03-01), p. 033101-
    Kurzfassung: The semiclassical method based on Feynman’s path-integral is in favor of uncovering the quantum tunneling effect, the classical trajectory description of the electron, and the quantum phase information, which can present an intuitive and transparent physical image of electron’s propagation in comparison with the ab initio time-dependent Schrödinger equation. In this review, we introduce the basic theoretical concepts and development of several semiclassical methods as well as some of their applications in strong-field physics. Special emphasis is placed on extracting time delay on attosecond scale by the combination of the semiclassical method with phase of phase method. Hundreds of millions of trajectories are generally adopted to obtain a relatively high-resolution photoelectron spectrum, which would take a large amount of time. Here we also introduce several optimization approaches of the semiclassical method to overcome the time-consuming problem of violence calculation.
    Materialart: Online-Ressource
    ISSN: 1674-1056
    URL: Article
    DOI: 10.1088/1674-1056/ac306b
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2022
    ZDB Id: 2412147-2
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Online-Ressource
    Open Access Wunsch
    Verfügbarkeit (elektronisch / print)
    BTU Cottbus
  • 3
    Online-Ressource
    Online-Ressource
    Investigation of stretchable strain sensor based on CNT/AgNW applied in smart wearable devices
    IOP Publishing ; 2022
    In:  Nanotechnology Vol. 33, No. 25 ( 2022-06-18), p. 255501-
    Details
    In: Nanotechnology, IOP Publishing, Vol. 33, No. 25 ( 2022-06-18), p. 255501-
    Kurzfassung: Stretchable strain sensor, an important paradigm of wearable sensor which can be attached onto clothing or even human skin, is widely used in healthcare, human motion monitoring and human-machine interaction. Pattern-available and facile manufacturing process for strain sensor is pursued all the time. A carbon nanotube (CNT)/silver nanowire (AgNW)-based stretchable strain sensor fabricated by a facile process is reported here. The strain sensor exhibits a considerable Gauge factor of 6.7, long-term durability ( 〉 1000 stretching cycles), fast response and recovery (420 ms and 600 ms, respectively), hence the sensor can fulfill the measurement of finger movement. Accordingly, a smart glove comprising a sensor array and a flexible printed circuit board is assembled to detect the bending movement of five fingers simultaneously. Moreover, the glove is wireless and basically fully flexible, it can detect the finger bending of wearer and display the responses distinctly on an APP of a smart phone or a host computer. Our strain senor and smart glove will broaden the materials and applications of wearable sensors.
    Materialart: Online-Ressource
    ISSN: 0957-4484 , 1361-6528
    URL: Article
    DOI: 10.1088/1361-6528/ac5ee6
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2022
    ZDB Id: 1362365-5
    SSG: 11
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Online-Ressource
    Open Access Wunsch
    Verfügbarkeit (elektronisch / print)
    BTU Cottbus
  • 4
    Online-Ressource
    Online-Ressource
    In situ calibrating angle between the quantization axis and the propagating direction of light field for trapping neutral atoms
    IOP Publishing ; 2023
    In:  Chinese Physics B
    Details
    In: Chinese Physics B, IOP Publishing
    Kurzfassung: The recently developed magic-intensity trapping technique of neutral atoms efficiently mitigates the detrimental effects of light shifts on atomic qubits and substantially enhances the coherence times. This technique relies on applying a bias magnetic field to be precisely parallel to the wave vector of a circularly polarized trapping laser field. However, due to the presence of vector light shift experienced by the trapped atoms, it is challenging to precisely define a parallel magnetic field, especially at a low bias magnetic field strength for the magic-intensity trapping of 85 Rb qubits. In this work, we present a method to calibrate the angle between the bias magnetic field and the trapping laser field with the compensating magnetic fields in the other two directions orthogonal to the bias magnetic field direction. Experimentally, with a constant-depth trap and a fixed bias magnetic field, we measure the respective resonant frequencies of the atomic qubits in a linearly polarized trap and a circularly polarized one via the conventional microwave Rabi spectra with different compensating magnetic fields, and obtain the corresponding total magnetic fields via the respective resonant frequencies using the Breit-Rabi formula. With known total magnetic fields, the angle is a function of the other two compensating magnetic fields. Finally, the projection value of the angle on either of the directions orthogonal to the bias magnetic field direction can be reduced to 0(4)° by applying specific compensating magnetic fields. The measurement error is mainly attributed to the fluctuation of atomic temperature. Moreover, it also demonstrates that the effect is strong enough to cause large decoherence of Rabi oscillation in a magic-intensity trap even for a small angle. Although this compensation method demonstrated here is explored for the magic-intensity trapping technique, it can be applied to a variety of similar precision measurements with trapped neutral atoms.
    Materialart: Online-Ressource
    ISSN: 1674-1056
    URL: Article
    DOI: 10.1088/1674-1056/acf11d
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2023
    ZDB Id: 2412147-2
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Online-Ressource
    Open Access Wunsch
    Verfügbarkeit (elektronisch / print)
    BTU Cottbus
  • 5
    Online-Ressource
    Online-Ressource
    The afterglow emission from a stratified jet in GRB 170817A
    IOP Publishing ; 2021
    In:  Research in Astronomy and Astrophysics Vol. 21, No. 7 ( 2021-08-01), p. 177-
    Details
    In: Research in Astronomy and Astrophysics, IOP Publishing, Vol. 21, No. 7 ( 2021-08-01), p. 177-
    Kurzfassung: The afterglow of GRB 170817A has been detected for more than three years, but the origin of the multi-band afterglow light curves remains under debate. A classical top-hat jet model is faced with difficulties in producing a shallow rise of the afterglow light curves as observed ( F ν ∝ T 0.8 ). Here we reconsider the model of stratified ejecta with an energy profile of E ( 〉 Γ β ) = E 0 ( Γ β ) − k as the origin of the afterglow light curves of the burst, where Γ and β are the Lorentz factor and speed of the ejecta, respectively. k is the power-law slope of the energy profile. We consider that the ejecta are collimated into jets. Two kinds of jet evolutions are investigated, including a lateral-spreading jet and a non-lateral-spreading jet. We fit the multi-band afterglow light curves, including the X-ray data at one thousand days post-burst, and find that both the models of the spreading and non-spreading jets can fit the light curves well, but the observed angular size of the source and the apparent velocity of the flux centroid for the spreading jet model are beyond the observation limits, while the non-spreading jet model meets the observation limits. Some of the best-fit parameters for the non-spreading jet model, such as the number density of the circumburst medium ∼10 −2 cm −3 and the total jet kinetic energy E ∼ 4.8 × 10 51 erg, also appear plausible. The best-fit slope of the jet energy profile is k ∼ 7.1. Our results suggest that the afterglow of GRB 170817A may arise from the stratified jet and that the lateral spreading of the jet is not significant.
    Materialart: Online-Ressource
    ISSN: 1674-4527
    URL: Article
    DOI: 10.1088/1674-4527/21/7/177
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2021
    ZDB Id: 2511247-8
    SSG: 6,25
    SSG: 16,12
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Online-Ressource
    Open Access Wunsch
    Verfügbarkeit (elektronisch / print)
    BTU Cottbus
  • 6
    Online-Ressource
    Online-Ressource
    High crystalline quality of SiGe fin fabrication with Si-rich composition area using replacement fin processing*
    IOP Publishing ; 2020
    In:  Chinese Physics B Vol. 29, No. 8 ( 2020-08-01), p. 087303-
    Details
    In: Chinese Physics B, IOP Publishing, Vol. 29, No. 8 ( 2020-08-01), p. 087303-
    Kurzfassung: A high crystalline quality of SiGe fin with an Si-rich composition area using the replacement fin processing is systematically demonstrated in this paper. The fin replacement process based on a standard FinFET process is developed. A width of less than 20-nm SiGe fin without obvious defect impact both in the direction across the fin and in the direction along the fin is verified by using the high angle annular dark field scanning transmission electron microscopy and the scanning moiré fringe imaging technique. Moreover, the SiGe composition is inhomogenous in the width of the fin. This is induced by the formation of {111} facets. Due to the atomic density of the {111} facets being higher, the epitaxial growth in the direction perpendicular to these facets is slower than in the direction perpendicular to {001}. The Ge incorporation is then higher on the {111} facets than on the {001} facets. So, an Si-rich area is observed in the central area and on the bottom of SiGe fin.
    Materialart: Online-Ressource
    ISSN: 1674-1056
    URL: Article
    DOI: 10.1088/1674-1056/ab973e
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2020
    ZDB Id: 2412147-2
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Online-Ressource
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    BTU Cottbus
  • 7
    Online-Ressource
    Online-Ressource
    Robust and intrinsic type-III nodal points in a diamond-like lattice
    IOP Publishing ; 2022
    In:  Chinese Physics B Vol. 31, No. 11 ( 2022-11-01), p. 117101-
    Details
    In: Chinese Physics B, IOP Publishing, Vol. 31, No. 11 ( 2022-11-01), p. 117101-
    Kurzfassung: An ideal type-III nodal point is generated by crossing a completely flat band and a dispersive band along a certain momentum direction. To date, the type-III nodal points found in two-dimensional (2D) materials have been mostly accidental and random rather than ideal cases, and no one mentions what kind of lattice can produce ideal nodal points. Here, we propose that ideal type-III nodal points can be obtained in a diamond-like lattice. The flat bands in the lattice originate from destructive interference of wavefunctions, and thus are intrinsic and robust. Moreover, the specific lattice can be realized in some 2D carbon networks, such as T-graphene and its derivatives. All the carbon structures possess type-III Dirac points. In two of the structures, consisting of triangular carbon rings, the type-III Dirac points are located just on the Fermi level and the Fermi surface is very clean. Our research not only opens a door to finding the ideal type-III Dirac points, but also provides 2D materials for exploring their physical properties experimentally.
    Materialart: Online-Ressource
    ISSN: 1674-1056
    URL: Article
    DOI: 10.1088/1674-1056/ac7c00
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2022
    ZDB Id: 2412147-2
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Online-Ressource
    Open Access Wunsch
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    BTU Cottbus
  • 8
    Online-Ressource
    Online-Ressource
    Timing analysis of the black hole candidate EXO 1846–031 with Insight-HXMT monitoring
    IOP Publishing ; 2021
    In:  Research in Astronomy and Astrophysics Vol. 21, No. 3 ( 2021-04-01), p. 070-
    Details
    In: Research in Astronomy and Astrophysics, IOP Publishing, Vol. 21, No. 3 ( 2021-04-01), p. 070-
    Kurzfassung: We present the observational results from a detailed timing analysis of the black hole candidate EXO 1846–031 during its outburst in 2019 with the observations of Insight -HXMT, NICER and MAXI . This outburst can be classified roughly into four different states. Type-C quasi-periodic oscillations (QPOs) observed by NICER (about 0.1–6 Hz) and Insight -HXMT (about 0.7–8 Hz) are also reported in this work. Meanwhile, we study various physical quantities related to QPO frequency. The QPO rms–frequency relationship in the energy band 1–10 keV indicates that there is a turning pointing in frequency around 2 Hz, which is similar to that of GRS 1915+105. A possible hypothesis for the relationship above may be related to the inclination of the source, which may require a high inclination to explain it. The relationships between QPO frequency and QPO rms, hardness, total fractional rms and count rate have also been found in other transient sources, which can indicate that the origin of type–C QPOs is non-thermal.
    Materialart: Online-Ressource
    ISSN: 1674-4527
    URL: Article
    DOI: 10.1088/1674-4527/21/3/70
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2021
    ZDB Id: 2511247-8
    SSG: 6,25
    SSG: 16,12
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Online-Ressource
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    Verfügbarkeit (elektronisch / print)
    BTU Cottbus
  • 9
    Online-Ressource
    Online-Ressource
    A new calibration method for charm jet identification validated with proton-proton collision events at √s = 13 TeV
    IOP Publishing ; 2022
    In:  Journal of Instrumentation Vol. 17, No. 03 ( 2022-03-01), p. P03014-
    Details
    In: Journal of Instrumentation, IOP Publishing, Vol. 17, No. 03 ( 2022-03-01), p. P03014-
    Kurzfassung: Many measurements at the LHC require efficient identification of heavy-flavour jets, i.e. jets originating from bottom (b) or charm (c) quarks. An overview of the algorithms used to identify c jets is described and a novel method to calibrate them is presented. This new method adjusts the entire distributions of the outputs obtained when the algorithms are applied to jets of different flavours. It is based on an iterative approach exploiting three distinct control regions that are enriched with either b jets, c jets, or light-flavour and gluon jets. Results are presented in the form of correction factors evaluated using proton-proton collision data with an integrated luminosity of 41.5 fb -1 at  √s = 13 TeV, collected by the CMS experiment in 2017. The closure of the method is tested by applying the measured correction factors on simulated data sets and checking the agreement between the adjusted simulation and collision data. Furthermore, a validation is performed by testing the method on pseudodata, which emulate various mismodelling conditions. The calibrated results enable the use of the full distributions of heavy-flavour identification algorithm outputs, e.g. as inputs to machine-learning models. Thus, they are expected to increase the sensitivity of future physics analyses.
    Materialart: Online-Ressource
    ISSN: 1748-0221
    URL: Article
    DOI: 10.1088/1748-0221/17/03/P03014
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2022
    ZDB Id: 2235672-1
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Online-Ressource
    Open Access Wunsch
    Verfügbarkeit (elektronisch / print)
    BTU Cottbus
  • 10
    Online-Ressource
    Online-Ressource
    Operation and performance of the ATLAS semiconductor tracker in LHC Run 2
    IOP Publishing ; 2022
    In:  Journal of Instrumentation Vol. 17, No. 01 ( 2022-01-01), p. P01013-
    Details
    In: Journal of Instrumentation, IOP Publishing, Vol. 17, No. 01 ( 2022-01-01), p. P01013-
    Kurzfassung: The semiconductor tracker (SCT) is one of the tracking systems for charged particles in the ATLAS detector. It consists of 4088 silicon strip sensor modules. During Run 2 (2015–2018) the Large Hadron Collider delivered an integrated luminosity of 156 fb -1 to the ATLAS experiment at a centre-of-mass proton-proton collision energy of 13 TeV. The instantaneous luminosity and pile-up conditions were far in excess of those assumed in the original design of the SCT detector. Due to improvements to the data acquisition system, the SCT operated stably throughout Run 2. It was available for 99.9% of the integrated luminosity and achieved a data-quality efficiency of 99.85%. Detailed studies have been made of the leakage current in SCT modules and the evolution of the full depletion voltage, which are used to study the impact of radiation damage to the modules.
    Materialart: Online-Ressource
    ISSN: 1748-0221
    URL: Article
    DOI: 10.1088/1748-0221/17/01/P01013
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2022
    ZDB Id: 2235672-1
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
    Open Access Wunsch
    Verfügbarkeit (elektronisch / print)
    BTU Cottbus
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