Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Superconductivity: Poster Session
TT 19.46: Poster
Montag, 7. März 2016, 15:00–18:00, Poster D
Single crystal Bi2Sr2CaCu2O8 structures as THz-emitters — •Raphael Wieland1, Fabian Rudau1, Julian Langer1, Nickolay Kinev2, Jie Yuan3, Ya Huang3,4, Min Ji3,4, Xianjing Zhou3,4, Akira Ishii3, Peiheng Wu4, Takeshi Hatano3, Huabing Wang3,4, Valery Koshelets2, Dieter Koelle1, and Reinhold Kleiner1 — 1Physikalisches Institut and Center for Collective Quantum Phenomena in LISA+, Universität Tübingen, Tübingen, Germany — 2Kotel’nikov Institute of Radio Engineering and Electronics, Moscow, Russia — 3National Institute for Materials Science, Tsukuba, Japan — 4Research Institute of Superconductor Electronics, Nanjing University, Nanjing, China
By means of Josephson Junctions (JJs) one can easily convert a dc voltage into high-frequency electromagnetic radiation. The high-Tc superconductor Bi2Sr2CaCu2O8 (BSCCO) has a layered crystal structure in such a way that JJs form intrinsically. This allows to fabricate hundreds of stacked junctions with reasonable effort. Terahertz emission can be observed at relatively low bias currents but also at higher input power. Emission frequencies from 0.4 to 2.4 THz have been measured. A hot spot forms at high bias currents with effect on both intensity and linewidth of the THz emission.BSCCO mesas probably act as a cavity for electromagnetic standing waves that synchronize all junctions in the stack. We investigated hotspot formation and THz emission using a combination of transport measurements, low temperature scanning laser microscopy and electromagnetic wave detection via a superconducting receiver.