Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 51: Superconductivity: Tunneling, Josephson Junctions, SQUIDs

TT 51.8: Vortrag

Mittwoch, 9. März 2016, 17:00–17:15, H19

Coherent emission of terahertz radiation from intrinsic Josephson junctions in Bi₂Sr₂CaCu₂O₈ — •Fabian Rudau¹, Raphael Wieland¹, Xianjing Zhou^2,3, Min Ji^2,3, Nickolay Kinev⁴, Luyao Hao^2,3, Ya Huang^2,3, Jun Li², Peiheng Wu², Takeshi Hatano³, Valery Koshelets⁴, Huabing Wang^2,3, 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-T_c 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.