Investigating pairing interactions with coherent charge fluctuation spectroscopy

It has been recently demonstrated that a pump pulse can generate coherent charge fluctuations in a superconductor through a stimulated Raman process [Mansart, et al., Proc. Natl. Acad. Sci. USA 110, 4539 (2013)]. Here, we present a tutorial review of the basic phenomena involved and show how the technique bears a strong analogy with nuclear magnetic resonance and electron paramagnetic resonance. The reflectivity of the system gets modulated by the coherent charge fluctuation of the condensate. A resonance at the Mott scale allows to identify a high-energy excitation which is coupled to the superconducting quasiparticles.     

The fast show with x‐rays and electrons

On October 20–26, 2004, more than 350 people participated in the 31st Annual Stanford Synchrotron Radiation Laboratory (SSRL) Users' Meeting, workshops, and social events. The presentation by SSRL Director Keith Hodgson in the opening session focused on the success in 2004 in getting SPEAR3 and the SSRL beam lines operating and productive. Looking towards the future, he discussed the exciting new opportunities at the Linac Coherent Light Source (LCLS), an X-ray free electron laser. Hodgson emphasized the importance of safety when conducting experiments at SSRL, a point strongly reiterated by SLAC Director Jonathan Dorfan.     

A Complete Renormalization Group Trajectory Between Two Fixed Points

We give a rigorous nonperturbative construction of a massless discrete trajectory for Wilson’s exact renormalization group. The model is a three dimensional Euclidean field theory with a modified free propagator. The trajectory realizes the mean field to critical crossover from the ultraviolet Gaussian fixed point to an analog recently constructed by Brydges, Mitter and Scoppola of the Wilson-Fisher nontrivial fixed point.     

Exploring the hydrogen absorption into Pd–Ir nanoalloys supported on carbon

Journal of Nanoparticle Research - Copper/silver core/shell nanopowders with different metal ratio have been elaborated by electrochemistry (ultrasound-assisted electrolysis followed by a...     

Round off error analysis for Gram-Schmidt method and solution of linear least squares problems

Round off error analysis for the classical Gram-Schmidt orthogonalization method with re-orthogonalization is presented. The effect of the round-off error on the orthogonality of the derived vectors and also on the solution of the linear least squares problems when solved by the Gram-Schmidt algorithm are given. Numerical results compared favorably with the results of other methods. The classical case when no re-orthogonalization takes place is also discussed.     

A new band system in the ultraviolet emission spectrum of no trapped in an argon matrix

A new ultraviolet band system identified as emission from the theoretically predicted but so far unobserved ²Φ state of NO trapped in an argon matrix is reported. The energy of the ν = 0 level is estimated to be 6.57 ± 0.015 or 6.785 ± 0.015 eV. The intensity distribution yields an internuclear distance of 1.415 ± 0.015 Å.