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Molecules selectively transform light energy from the sun into other forms of energy like heat, electricity, or chemical energy with high quantum efficiency. The energy conversion process is the result of a correlated motion of electrons and nuclei after photoexcitation, often under breakdown of the Born-Oppenheimer approximation. The element and site selectivity of x-rays allows observing molecular...
Electric polarization in conventional ferroelectric oxides usually involves nonmagnetic transition-metal ions with an empty d shell (the d0 rule). Here we unravel a new mechanism for local electric dipoles based on magnetic Fe3+ (3d5) ion violating the d0 rule (Fig. 1a). The competition between the long-range Coulomb interaction and short-range Pauli repulsion in a FeO5 bipyramid with proper lattice...
Negative refraction through a fishnet related metamaterial is demonstrated at 0.5 THz. This characterization is based on refraction angle determination through a prism-like structure. The measurements are performed by means of a goniometric time-domain spectroscopy system while a numerical assessment is carried out by full wave electromagnetic analysis.
This paper addresses a fundamental question on the physics of negative bias temperature instability (NBTI). Besides interface states, is oxide trapped charge (i.e., trapped holes) generated concurrently by NBTI stress? The discussion is made against a backdrop of critical questions, evolving from recent studies, which challenge the validity of the charge pumping method used commonly for quantifying...
Fresnel lenses have a number of attractive properties for pulsed terahertz imaging. We demonstrate tomographic imaging with a Fresnel lens and report progress towards the goal of long range terahertz imaging.
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