Dresden 2009 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 10: Superconductivity: Tunneling, Josephson Junctions, SQUIDs
TT 10.2: Talk
Monday, March 23, 2009, 14:15–14:30, HSZ 105
Fabrication of large Bi2Sr2CaCu2O8+δ mesas for THz emission — •Yilmaz Simsek1, Lütfi Özyüzer1,2, Yuri Koval1, Paul Müller1, and Huabing Wang3 — 1Department of Physics, Universität Erlangen-Nürnberg, Erwin-Rommel-Strasse. 1, D-91058, Erlangen, Germany — 2Department of Physics, Izmir Institute of Technology, Izmir, Turkey — 3National Institute of Material Science, Japan
Recently, the observation of THz radiation from Bi2Sr2CaCu2O8+δ (Bi-2212) single crystals stimulated the research on intrinsic Josephson junctions (IJJ)[1]. We have fabricated large area mesas including many IJJ stacks on Bi-2212 single crystals by electron beam lithography and Ar ion beam etching techniques. As the observed THz emission is probably due to cavity resonances, the fabrication technique was optimized to obtain clear rectangular shapes. We have fabricated large and tall mesas by selective Ar ion beam etching of a Ti layer on Bi-2212. The samples were characterized by dc I-V measurements. We discuss possible resonant features of the I-V characteristics.
[1] L. Ozyuzer, A. E. Koshelev, C. Kurter, N. Gopalsami, Q. Li, M. Tachiki, K. Kadowaki, T. Yamamoto, H. Minami, H. Yamaguchi, T. Tachiki, K. E. Gray, W.-K. Kwok, U. Welp, Science 318, 1291 (2007).
*L.O. acknowledges support from Alexander von Humboldt Foundation.