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  • AIP Publishing  (6)
  • 1
    Online Resource
    Online Resource
    Spin-resolved transport physics induced by a Majorana-fermion zero mode
    AIP Publishing ; 2019
    In:  AIP Advances Vol. 9, No. 12 ( 2019-12-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 9, No. 12 ( 2019-12-01)
    Abstract: By using the Hubbard operator Green’s function method, the spin-resolved transport properties of a quantum dot coupled to metallic leads and side-coupled to a topological superconductor wire hosting Majorana bound states (MBSs) are studied theoretically. Compared with the second quantization representation, the method can lead us to an analytical result for the retarded Green’s function with finite U. The spin-related current and conductance are discussed. In the case of zero Coulomb interaction and on-resonance, the MBS’s 1/2 signature is recovered, and furthermore, there exists a 1/2 negative differential spin conductance. In the case of infinite Coulomb interaction, the 1/2 signature does not survive due to the Coulomb correlation reducing the current and conductance. Also due to this correlation, the MBS-induced symmetry of conductance peaks around zero energy is destroyed. In addition to this, we find that there are two MBS-induced negative differential spin conductance peaks. Theoretically, our work is supplementary and contrastive to the mainstream second quantization method, and these spin-resolved results may be observed in future experiments.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5132904
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2583909-3
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Study on insulation defect discharge features of dry-type reactor based on audible acoustic
    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: The audible signal (20 Hz to 20 kHz) generated during the operation of a dry-type reactor is one of the key features to evaluate its operation state. However, at present, the time/frequency domain features of the audible signal under typical insulation defects are not clear, which makes it difficult to effectively carry out the fault diagnosis of the dry-type reactor based on audible signals. Based on this, the audible signal features under typical insulation defect discharge of the dry-type reactor are studied in this paper. Three typical insulation defect discharge models (metal protrusion defect, pollution defect, and metal foreign bodies defect) are simulated; then, the discharge acoustic signals are collected under the voltage of 8 kV. Analysis of acoustic signal features shows that the acoustic signal of metal protrusion defect discharge occurs in the positive half cycle of power frequency with the cycle of 20 ms. Both pollution defect discharge and metal foreign bodies defect discharge show intermittent discharge; during the discharge, the discharge acoustic signal of pollution defect has features similar to that of metal protrusion defect, while the discharge of metal foreign bodies defect shows randomness with a larger amplitude of discharge acoustic signal (up to 110 dB). Based on the frequency domain feature vectors’ extraction, it is found that the odd harmonic component of the metal protrusion defect discharge acoustic signal accounts for more than twice the even-order harmonic, and the high-frequency energy (12.5–25 kHz) is the main component. The discharge acoustic signal of the metal foreign bodies defect is mainly low-frequency energy, and the high-frequency energy proportion of pollution defect discharge acoustic signal is similar to that of low-frequency energy. In addition, the variance of high-frequency energy ratio (Rhf) of the metal foreign bodies defect discharge acoustic signal is 5.25 and 21 times that of the metal protrusion defect and pollution defect. This study provides some technical support for further detection and assessment of the operation state of the dry-type reactor based on audible signals.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/5.0078735
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2583909-3
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  • 3
    Online Resource
    Online Resource
    Electronic structure of non-centrosymmetric PtBi2 studied by angle-resolved photoemission spectroscopy
    AIP Publishing ; 2020
    In:  Journal of Applied Physics Vol. 128, No. 13 ( 2020-10-07)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 128, No. 13 ( 2020-10-07)
    Abstract: Using high-resolution angle-resolved photoemission spectroscopy (ARPES), we have systematically studied the electronic structure of non-centrosymmetric PtBi2 with a layered structure. Through photon energy dependent measurements, the surface state and the bulk state were identified. Consistent with the non-centrosymmetric structure, different surface states were observed on opposite PtBi2(001) surfaces. Experimental bulk bands agree nicely with first-principle calculations. By combining ARPES and calculations, energy bands that contribute to triply degenerate point fermion were all detected. We also suggest that there are “canted” tube-like Fermi surfaces that might cause strong anisotropy in electronic transportation in non-centrosymmetric PtBi2.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0020622
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 4
    Online Resource
    Online Resource
    Anisotropic surface state in a topological semimetal candidate Ta3SiTe6
    AIP Publishing ; 2022
    In:  Applied Physics Letters Vol. 120, No. 4 ( 2022-01-24)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 120, No. 4 ( 2022-01-24)
    Abstract: Using high-resolution angle-resolved photoemission spectroscopy, we studied the surface state of Ta3SiTe6, a candidate of topological semimetal protected by nonsymmorphic symmetry. Through photon-energy dependent measurements, the surface state near the Fermi level was detected. By determining the band dispersions, we found that the surface state is topological trivial. Around the surface Brillouin zone center, the surface bands disperse linear-like, forming a band crossing (zero energy gap) point at about 0.2 eV below the Fermi level. In Ta3SiTe6's rectangular surface Brillouin zone, the surface bands only cross the Fermi level along one axis, forming two hole-like Fermi pockets near surface Brillouin zone boundaries. Although the observed surface state is not topological, we proposed that its anisotropic Fermi surface topography could be potentially useful for future applications.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0073344
    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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  • 5
    Online Resource
    Online Resource
    Energy transfer between Co2+ and Fe2+ ions in diffusion-doped ZnSe
    AIP Publishing ; 2005
    In:  Journal of Applied Physics Vol. 98, No. 8 ( 2005-10-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 98, No. 8 ( 2005-10-15)
    Abstract: Absorption, photoluminescence (PL), and time-resolved PL measurements were applied to samples of polycrystalline ZnSe which were diffusion doped with iron or with cobalt or codoped with both iron and cobalt. Characteristic emission and absorption features due to Co2+ and Fe2+ were observed in the visible and infrared regions. In the spectral region near 3μm, a Co2+ emission overlaps completely with an Fe2+ absorption and energy transfer occurs. Using PL lifetime data, a decrease in the Co2+ lifetime of ∼300μs to less than 100μs was observed. This decrease in lifetime indicates that the nature of the energy-transfer process is nonradiative. The energy-transfer rate decreases with temperature, as expected for the nonradiative electric dipole-dipole interaction. The temperature dependences of both Co2+ and Fe2+ emissions are described.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.2102069
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    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
    Optical and electron paramagnetic resonance spectroscopies of diffusion-doped Co2+:ZnSe
    AIP Publishing ; 2006
    In:  Journal of Applied Physics Vol. 99, No. 7 ( 2006-04-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 99, No. 7 ( 2006-04-01)
    Abstract: The efficacy of diffusing cobalt into window-grade polycrystalline ZnSe during high-temperature anneals has been studied. Absorption, photoluminescence (PL), time-resolved PL, and electron paramagnetic resonance (EPR) were used to characterize samples with cobalt concentrations ranging from 1017to1019cm−3. Absorption and PL were used to monitor the optical properties of Co2+ impurities, as well as detect Ni2+ and Fe2+ ions due to unintentional contamination. The temperature dependence of the 3μm emission due to Co2+ ions was measured and lifetimes were determined. EPR was used to monitor the paramagnetic charge states (Co2+, Ni3+, and Fe3+) of the transition-metal ions in our samples. The effects of nickel and iron impurities on the Co2+ infrared emission intensity and lifetime are discussed.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.2188030
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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