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 Ji^4,5, Ya Huang^4,5, Xianjing Zhou^4,5, Deyue An^4,5, Thomas Judd¹, Peihang Wu⁵, Takeshi Hatano⁴, Huabing Wang^4,5, 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 — 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.