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TT: Fachverband Tiefe Temperaturen
TT 51: Superconductivity: Tunneling, Josephson Junctions, SQUIDs
TT 51.8: Talk
Wednesday, March 9, 2016, 17:00–17:15, H19
Coherent emission of terahertz radiation from intrinsic Josephson junctions in Bi2Sr2CaCu2O8 — •Fabian Rudau1, Raphael Wieland1, Xianjing Zhou2,3, Min Ji2,3, Nickolay Kinev4, Luyao Hao2,3, Ya Huang2,3, Jun Li2, Peiheng Wu2, Takeshi Hatano3, Valery Koshelets4, Huabing Wang2,3, Dieter Koelle1, and Reinhold Kleiner1 — 1Physikalisches Institut and Center for Quantum Science (CQ) in LISA+, Universität Tübingen, Germany — 2Research Institute of Superconductor Electronics, Nanjing University, China — 3National Institute for Materials Science, Tsukuba, Japan — 4Kotel’nikov Institute of Radio Engineering and Electronics, Moscow, Russia
Stacks of intrinsic Josephson junctions, made of the high-Tc superconductor Bi2Sr2CaCu2O8, can be used as emitters of electromagnetic waves at terahertz frequencies. Coherent emission from 0.3 to 2.4 THz was detected from large, rectangular or disc-shaped mesa structures. Having a linewidth of only a few MHz, emission powers of several tens of microwatt can be produced for single stacks and up to 0.61 mW for an array of mesas.
Since the mechanisms of synchronizing all the junctions in the stack is still not fully understood, we investigated the temperature distribution and electromagnetic standing waves in such stacks, as well as the generation of terahertz radiation, using a combination of electric transport measurements, direct radiation detection and low temperature scanning laser microscopy. Recent experimental results from our collaboration will be presented and compared to numerical simulations.