We investigate theoretically electron transfer in a double dot in a situation where spin blockade is lifted by nuclear magnetic field: this has been recently achieved in experiment [F. Koppens, Science 309, 1346 (2005)]. We show that for a given realization of nuclear magnetic field spin blockade can be restored by tuning external magnetic field; this may be useful for quantum manipulation of t...

We report an electron transport study of lithographically fabricated graphene nanoribbons (GNRs) of various widths and lengths. At the charge neutrality point, a length-independent transport gap forms whose size is inversely proportional to the GNR width. In this gap, electrons are localized, and charge transport exhibits a transition between thermally activated behavior at higher temperatures ...

Electron transport through a single C60 molecule on Cu(1 1 1) has been investigated with a scanning tunnelling microscope in tunnelling and contact ranges. Single-C60 junctions have been fabricated by establishing a contact between the molecule and the tip, which is reflected by a down-shift in the lowest unoccupied molecular orbital resonance. These junctions are stable even at elevated bias v...

Electron-probe x-ray micro analysis (EPMA) and particle-induced x-ray emission analysis (PIXE) were performed under grazing-exit conditions. To control the exit angle (take-off angle), a new sample holder having a stepping motor was developed for grazing-exit EPMA. A carefully polished surface of a stainless-steal sample was measured. The surface of stainless steel is normally covered with a th...

Electron tomography is a powerful tool in elucidating the three-dimensional architecture of large biological complexes and subcellular organelles. Its use can be expanded through the simplification of the tomographic procedure by automation of its tasks. In this paper, we describe our EMACT/EMCAT system, which automates both tomographic data collection and reconstruction.

Single-pass free electron lasers require high peak currents from ultra-short electron bunches to reach saturation and an accurate measurement of bunch length and longitudinal bunch profile is necessary to control the bunch compression process from low to high beam energy. The various state-of-the-art diagnostics methods from ps to fs time scales using coherent radiation detection, RF deflection...

Some light green grossular garnets exhibit orange-red luminescence under long-wave and short-wave ultraviolet light. To characterize their behavior, we studied seven with typical colors ranging from yellowish-green to intense by using photoluminescence (PL), ultraviolet–visible (UV–Vis) spectroscopy, electron paramagnetic resonance (EPR), Electron Probe Microanalysis (EPMA) laser ablation induc...

Present society challenges, including metal scarcity, recycling, and environmental restrictions, resulted in the increased complexity variability of metallurgical feed streams. Metallurgical processes involving complex lead copper-containing slag matte phases are now commonly used response. Optimization existing development new require fundamental information on slag–matte phase equilibrium. De...

Sedimentary and hydrothermal pyrites contained in selected Malaysian black shale cherts have been analysed using laser ablation inductively coupled plasma (LA ICP-MS) electron probe microanalysis (EPMA) at the University of Tasmania, Australia. This study shows that gold is concentrated sedimentary pyrite Middle Permian to Late Triassic shales Devonian cherts. According LA ICP-MS analysis, cont...