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First experimental evidence for quantum echoes in scattering systems

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arxiv nlin/0408046 v1 pith:5SFJA4RV submitted 2004-08-26 nlin.CD cond-mat.mes-hallquant-ph

First experimental evidence for quantum echoes in scattering systems

C. Dembowski (1) , B. Dietz (1) , T. Friedrich (1) , H.-D. Graef (1) , A. Heine (1) , C. Mejia-Monasterio (2) , M. Miski-Oglu (1) , A. Richter (1)
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T. H. Seligman (3 4) ((1) Institut fuer Kernphysik Technische Universitaet Darmstadt Germany (2) Center for Nonlinear Complex Systems Como Italy (3) Centro de Ciencias Fisicas UNAM Mexico (4) Centro Internacional de Ciencias Cuernavaca Mexico)
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classification nlin.CD cond-mat.mes-hallquant-ph
keywords beenechoesexperimentsquantumsystemsassociatedbilliardchaos
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A self-pulsing effect termed quantum echoes has been observed in experiments with an open superconducting and a normal conducting microwave billiard whose geometry provides soft chaos, i.e. a mixed phase space portrait with a large stable island. For such systems a periodic response to an incoming pulse has been predicted. Its period has been associated to the degree of development of a horseshoe describing the topology of the classical dynamics. The experiments confirm this picture and reveal the topological information.

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