Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 66: Superconductivity: Tunneling, Josephson Junctions, SQUIDs

TT 66.1: Vortrag

Mittwoch, 18. März 2015, 15:00–15:15, H 2053

Coherent terahertz emission from Bi2Sr2CaCu2O8 intrinsic Josephson junction stacks — •Fabian Rudau1, Boris Gross1, Raphael Wieland1, Nickolay Kinev2, Manabu Tsujimoto3, Min Ji4,5, Ya Huang4,5, Xianjing Zhou4,5, Deyue An4,5, Thomas Judd1, Peiheng 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

Stacks of intrinsic Josephson junctions, made of the high temperature superconductor Bi2Sr2CaCu2O8, are promising candidates to be used as generators of electromagnetic waves in the terahertz regime, in principle allowing frequencies up to ∼10 THz. Ranging from 0.4 to 1 THz, coherent emission was detected from large, rectangular stacks, producing several tens of microwatt in power. Despite of several years of research, the mechanism of synchronizing all the junctions in the stack is still not fully understood. We investigated the heat 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.

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