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TT: Fachverband Tiefe Temperaturen

TT 17: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs

TT 17.7: Vortrag

Montag, 31. März 2014, 16:45–17:00, HSZ 201

Coherent terahertz emission from Bi₂Sr₂CaCu₂O₈ intrinsic Josephson junction stacks — •Fabian Rudau¹, Boris Gross¹, Deyue An^2,3, Nickolay Kinev⁴, Xianjing Zhou², Min Ji^2,3, Ya Huang², Takeshi Hatano³, Roman Mints⁵, Peiheng Wu², Valery Koshelets⁴, Huabing Wang^2,3, Dieter Koelle¹, and Reinhold Kleiner¹ — ¹Physikalisches Institut, Universität Tübingen — ²Institute of Superconductor Electronics, Nanjing University — ³National Institute for Materials Science, Tsukuba — ⁴Kotel’nikov Institute of Radio Engineering and Electronics, Moscow — ⁵School of Physics and Astronomy, Tel Aviv University

Josephson Junctions (JJs) offer a natural way to convert a dc voltage into high-frequency electromagnetic radiation. In the high-transition temperature superconductor Bi₂Sr₂CaCu₂O₈ JJs form intrinsically, allowing to fabricate stacks of hundreds of junctions easily. Such arrays are promising candidates to be used as generators of electromagnetic waves in the terahertz regime. Ranging from 0.4 to 1 THz, coherent radiation has been detected from large, rectangular Bi₂Sr₂CaCu₂O₈ mesa structures, producing several tens of microwatt in power. The mesas are believed to work as a cavity for electromagnetic standing waves, synchronizing all the junctions in the stack. We report on the investigation of the heat distribution and electromagnetic standing waves in such mesa structures, as well as the generation of terahertz radiation, using a combination of transport measurements, direct radiation detection, low temperature scanning laser microscopy and computer assisted modelling.