Physics / Fizik

Permanent URI for this collectionhttps://hdl.handle.net/11147/6

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Author: search.filters.author.Şimşek, YılmazInstitution Author: search.filters.institutionAuthor.Demirhan, Yasemin

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Now showing 1 - 2 of 2
  • Article
    Citation - WoS: 12
    Citation - Scopus: 13
    Emission of the Thz Waves From Large Area Mesas of Superconducting Bi 2sr2cacu2o8+? by the Injection of Spin Polarized Current
    (Elsevier Ltd., 2013) Türkoğlu, Fulya; Özyüzer, Lütfi; Özyüzer, Lütfi; Demirhan, Yasemin; Preu, S.; Demirhan, Yasemin; Şimşek, Yılmaz; Wang, Huabing; Muller, P.; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
    Rectangular Au/Co/Au/Bi2Sr2CaCu2O 8+δ (Bi2212) mesa structures with large areas and high thicknesses were fabricated on as-grown Bi2212 single crystals in order to obtain small critical current from as-grown mesas by the injection of spin polarized current and so eliminate the adjustment of doping level for successful THz emission. We have performed c-axis resistance versus temperature (R-T), current-voltage (I-V) characteristics and bolometer measurements. It is the first time that THz emission has been observed from as-grown mesas due to injection of spin polarized current. © 2013 Elsevier Ltd. All rights reserved.
  • Conference Object
    Terahertz Wave Emission From Layered Superconductors: Interferometer Measurements
    (Institute of Electrical and Electronics Engineers Inc., 2011) Özyüzer, Lütfi; Türkoğlu, Fulya; Demirhan, Yasemin; Köseoğlu, Hasan; Preu, S.; Özyüzer, Lütfi; Malzer, S.; Şimşek, Yılmaz; Wang, Huabing; Müller, P.; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
    Rectangular Bi2Sr2CaCu2O 8+δ (Bi2212) mesa structures were fabricated on as-grown Bi2212 single crystal superconductors using standard photolithography and Ar ion beam etching techniques. We have performed c-axis resistance versus temperature (R-T), current-voltage (I-V) characteristics and bolometer measurements. Furthermore, in contrast to previous studies, the emission frequency was determined using interferometer set up instead of FTIR. The interference patterns were detected outside the cryostat after traveling long way through ambient space. The emission frequency calculated by Fourier transform of interference data is consistent with Josephson frequency-voltage relation. © 2011 IEEE.