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Sökning: (WFRF:(Han Jung Hoon)) > (2020-2021)

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1.
  • Cho, Soohyun, et al. (författare)
  • Observation of Dresselhaus type spin splitting of zinc blende structure semiconductors by circular dichroic photoemission study
  • 2021
  • Ingår i: Current Applied Physics. - : Elsevier BV. - 1567-1739. ; 30, s. 96-101
  • Tidskriftsartikel (refereegranskat)abstract
    • Material family of zinc blende structure semiconductors (ZBSSs) is important for novel technique such as spintronics. A study of the ZBSS spin-splitting structure in momentum space is essential when seeking to understand the exotic properties of the material. The Dresselhaus field predominates in the bulk, but the Rashba field plays important roles in states near the surface. Here, we used circular dichroism in angle-resolved photoemission spectroscopy (CD-ARPES) to explore the spin-splitting structure of bulk ZBSS in momentum space. The observed structure was well-explained by a Dresselhaus field attributable to the lack of inversion symmetry in ZBSS crystals. We show that CD-ARPES usefully reveals spin-splitting in momentum space. CD-ARPES combined with hard x-ray incident-beam would be useful to investigate the spin-splitting structures of the interface states in the ZBSS heterostructure.
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2.
  • Gabrielsson, Erik, et al. (författare)
  • Autonomous Microcapillary Drug Delivery System Self-Powered by a Flexible Energy Harvester
  • 2021
  • Ingår i: Advanced Materials Technologies. - : Wiley-Blackwell. - 2365-709X. ; 6:11
  • Tidskriftsartikel (refereegranskat)abstract
    • Implantable bioelectronic devices pave the way for novel biomedical applications operating at high spatiotemporal resolution, which is crucial for neural recording and stimulation, drug delivery, and brain-machine interfaces. Before successful long-term implantation and clinical applications, these devices face a number of challenges, such as mechanical and operational stability, biocompatibility, miniaturization, and powering. To address two of these crucial challenges-miniaturization and powering-the development and characterization of an electrophoretic drug delivery device, manufactured inside fused quartz fibers (outer diameter of 125 mu m), which is self-powered by a flexible piezoelectric energy harvester, are reported. The resulting device-the first integration of piezoelectric charging with "iontronic" delivery-exhibits a high delivery efficiency (number of neurotransmitters delivered per charges applied) and a direct correlation between the piezoelectric charging and the amount delivered (number of dynamic bends versus pmols delivered).
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