Zhenlü Wang

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We measured shot noise and submillimeter-wave response in a superconducting NbN tunnel junction that had a subharmonic gap structure on the current-voltage (I-V) curve. We found that the observed effective charge, defined from the noise-current ratio, tends to a steplike function of voltage. In the presence of submillimeter-wave radiation of frequency v,(More)
Amorphous mesoporous aluminophosphates (AlPO) with P/Al molar ratio in the range 0.8-1.15 are synthesized by using the citric acid (CA) route and are systematically characterized using N(2)-adsorption, XRD, SEM, solid-state CP-MAS NMR, FT-IR, TG-DTA, CO(2)-TPD, and NH(3)-TPD. The characterization studies show that the change in P/Al ratio could affect the(More)
Recent simulations and experiments have hinted that the solid temperature may affect the dynamics of defect formation when the energies of bombarding ions fall below about 100 eV. The present work offers direct experimental confirmation of this phenomenon through measurements of the energy thresholds for ion-enhanced surface diffusion of indium on silicon(More)
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