Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 10: Superconductivity: Tunneling, Josephson Junctions, SQUIDs

TT 10.1: Talk

Monday, March 23, 2009, 14:00–14:15, HSZ 105

Terahertz emission from intrinsic Josephson junctions of high-T_c superconductor Bi2212 — •Lütfi Özyüzer^1,2, Hasan Köseoglu¹, Fulya Türkoglu¹, Cihan Kurter³, Ulrich Welp³, Ken E. Gray³, Alex E. Koshelev³, Takashi Yamamoto⁴, Kazuo Kadowaki⁴, Yilmaz Simsek², Yuri Koval², Paul Müller², and Huabing Wang⁵ — ¹Department of Physics, Izmir Institute of Technology, Izmir, Turkey — ²Phys. Inst. III, University of Erlangen-Nurnberg, Germany — ³Materials Science Division, Argonne National Laboratory, Illinois, USA — ⁴University of Tsukuba, Japan — ⁵National Institute for Materials Science, Japan

Recent realization of coherent and continuous emission of THz waves from intrinsic Josephson junctions of layered high temperature superconductor Bi₂Sr₂CaCu₂O_8+d (Bi2212) is promising to fill electromagnetic spectrum’s Terahertz gap [1]. Large area mesas ranging from 300x100 to 300x40 µm² with height greater than 1 µm were formed on Bi2212. Current-voltage and THz emission characteristics were obtained at various temperatures. THz emissions of mesas were studied by Si-composite bolometer and the emission frequencies were obtained.

[1] L. Ozyuzer, A. E. Koshelev, C. Kurter, N. Gopalsami, Q. Li, M. Tachiki, T. Yamamoto, H. Minami, H. Yamaguchi, T. Tachiki, K. E. Gray, W. K. Kwok and U. Welp, Science 318, 1291 (2007).

*This research is partially supported by TUBITAK (Sci. and Tech. Research Council of Turkey) project number 108T238. L.O. acknowledges support from Alexander von Humboldt Foundation.