Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Superconductivity: Poster Session

TT 21.42: Poster

Montag, 16. März 2015, 15:00–18:00, Poster B

Terahertz emission and electromagnetic waves in single crystal Bi2Sr2CaCu2O8 structures — •Raphael Wieland1, Fabian Rudau1, Boris Gross1, Nickolay Kinev2, Manabu Tsujimoto3, Min Ji4,5, Ya Huang4,5, Xianjing Zhou4,5, Deyue An4,5, Thomas Judd1, Peihang Wu5, Takeshi Hatano4, Huabing Wang4,5, Valery Koshelets2, Dieter Koelle1, and Reinhold Kleiner11Physikalisches Institut and Center for Collective Quantum Phenomena in LISA+, Universität Tübingen, Tübingen, Germany — 2Kotel’nikov Institute of Radio Engineering and Electronics, Moscow, Russia — 3Kyoto University, Kyoto, Japan — 4National Institute for Materials Science, Tsukuba, Japan — 5Research Institute of Superconductor Electronics, Nanjing University, Nanjing, China

Josephson Junctions (JJs) offer a natural way to convert a dc voltage into high-frequency electromagnetic radiation. In the high-Tc superconductor Bi2Sr2CaCu2O8 (BSCCO), JJs form intrinsically, allowing to fabricate stacks of hundreds of junctions easily. Emission can occur at relatively low bias currents but also at larger input power with frequencies from 0.4 to 1 THz. At high bias, a hot spot forms, affecting both the intensity and the linewidth of the radiation. BSCCO mesas are believed to work as a cavity for electromagnetic standing waves, synchronizing all the junctions in the stack. We investigated THz emission and hotspot formation using a combination of transport measurements, electromagnetic wave detection via a superconducting receiver and low temperature scanning laser microscopy.

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DPG-Physik > DPG-Verhandlungen > 2015 > Berlin