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The 9th International Symposium on Intrinsic Josephson Effects and THz Plasma Oscillations in High-Tc Superconductors (THz-PLASMA 2014) Kyoto Univ., Kyoto, Japan, November 30- December 3, 2014

Hot Spots and THz Waves in Bi2Sr2CaCu2O8 Intrinsic Josephson Junction Stacks: Recent Developments
B. Groъa, F. Rudaua, M. Tsujimotoa,b, T. Judda, N. Kinevc, M. Jid,e, J. Yuane, D. Y. And,e, M. Y. Lid,e, X. J. Zhoud,e, Y. Huangd, H. C. Sund, Q. Zhud, J. Lid, T. Hatanoe, W. W. Xud, B. B. Jind, P. H. Wud, D. Koellea, V. P. Kosheletsc, H. B. Wangd,e and R. Kleinera*
a

Physikalisches Institut and Center for Collective Quantum Phenomena in LISA+, TЭbingen, Germany b Kyoto University, Kyoto, Japan c Kotel'nikov Institute of Radio Engineering and Electronics, Moscow, Russia d Research Institute of Superconductor Electronics, Nanjing, China e National Institute for Materials Science, Tsukuba, Japan Corresponding author E-mail address: kleiner@uni-tuebingen.de Phone: +49-07071-2976315, Fax: +49-07071-5406
*

[keywords] Intrinsic Josephson junctions, THz emission, Hotspots, Low Temperature Scanning Laser Microscopy, Linewidth of radiation Stacks of intrinsic Josephson junctions made of the high temperature superconductor Bi2Sr2CaCu2O8 [1] emit coherent radiation at THz frequencies [2,3]. Emission can occur at relatively low bias but also at large input power. At high bias a hot spot forms [4], affecting both the

intensity and the linewidth of THz radiation [5]. Despite of several years of research the mechanism of synchronizing the junctions in the stack and the relation of hotspots and THz emission is still under debate [6]. 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 [3,4,5]. In this talk recent experimental results of our collaboration will be presented and compared to numerical simulations.

References [1] R. Kleiner and P. MЭller, Phys. Rev. B 49, 1327 (1994). [2] L. Ozyuzer et al, Science 318, 1291 (2007). [3] U. Welp, K. Kadowaki, and R. Kleiner, Nature Photonics 7, 702 (2013). [4] H. B. Wang, et al., Phys. Rev. Lett., 102, 017006, (2009). [5] D. Y. An, et al., Phys. Rev. Lett. 102, 092601 (2013). [6] H. Minami, et al, Phys. Rev. B 89, 054503 (2014).