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Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 31: SC: Tunnelling, Josephson Junctions

TT 31.2: Talk

Thursday, March 25, 2010, 09:45–10:00, H21

Spectral Features in Current-Voltage Characteristis of Terahertz Wave Emitting Bi2Sr2CaCu2O8+d Mesas — •Lütfi Özyüzer1, Yilmaz Simsek2, Hasan Köseoglu1, Fulya Türkoglu1, Yasemin Demirhan1, Zeynep Meric1, Cihan Kurter3, Ulrich Welp3, Ken E. Gray3, Takashi Yamamoto4, Kazuo Kadowaki4, Yuri Koval2, Huabing Wang5, and Paul Müller21Izmir Institute of Technology, Izmir, Turkey — 2University of Erlangen-Nürnberg, Germany — 3Argonne National Laboratory, USA — 4University of Tsukuba, Japan — 5National Institute for Materials Science, Japan

Terahertz electromagnetic radiations are more versatile in sensing, imaging, and spectroscopy applications across the physical and biological sciences. There is still lack of coherent, continuous, tunable and compact solid-state sources of electromagnetic wave at THz frequency range. Although Josephson junctions are potential candidate, the mechanism of terahertz waves from intrinsic Josephson junctions of layered high temperature superconductor Bi2Sr2CaCu2O8+d (Bi2212) mesas is still unresolved. Large area mesas ranging from 100x300 to 40x300 µm2 with various heights were formed on Bi2212. Current-voltage (I-V) and THz emission characteristics were obtained at various temperatures. Spectral features in I-V curves were investigated to find a correlation between emission frequency and feature energy.

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

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