Imaging Quasiparticle Interference in Bi 2 Sr 2 CaCu 2 O 8
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چکیده
to be broadened in the “plateau” region. 27. G. G. Paulus et al., Nature 414, 182 (2001). 28. Note that tiny variations in the peak laser intensity can make the harmonic structure more or less pronounced as revealed by spectra c and d in Fig. 3. However, the modulation depth was kept below 25% in all measurements shown in Fig. 5, resulting in negligible fractional satellite energy content. 29. It is important to emphasize that this timing stability may not be valid for arbitrary values of the absolute phase of the driver pulse because laser shots characterized by a considerably deviating from 0 or are expected to deliver only a small contribution to energy-shifted spectral features. As a consequence, the evaluated upper limit on the timing jitter applies to laser pulses with 0 or only. 30. This finding is in accordance with our recent measurement (9) resulting in almost zero phase distortion over the 5-eV bandwidth (FWHM) of the subfemtosecond harmonic pulse generated under similar experimental conditions in the same spectral range. 31. The theory used extensively in this work (11) was developed under the guidance of T. Brabec. The transmission-grating x-ray spectrograph was provided by T. Wilhein and by G. Schmahl. The computer-controlled data acquisition system was significantly improved by M. Hornung. We had illuminating discussions with G. Reider. All contributions are gratefully acknowledged. Sponsored by the Fonds zur Förderung der Wissenchaftlichen Forschung in Österreich (Austria, grants Y44-PHY and F016), the Deutsche Forschungsgemeinschaft (Germany, grants SPP1053, HE1049/9, and KL1077/1), and the European Union’s Human Potential Programme under contract HPRN2000-00133 (Atto).
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تاریخ انتشار 2002