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 Bi₂Sr₂CaCu₂O_8+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 Müller² — ¹Izmir 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 Bi₂Sr₂CaCu₂O_8+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.