2 8 Fe b 20 07 A widely tunable few electron droplet
نویسندگان
چکیده
Quasi–static transport measurements are employed to characterize a few electron quantum dot electrostatically defined in a GaAs/AlGaAs heterostructure. The gate geometry allows observations on one and the same electron droplet within a wide range of coupling strengths to the leads. The weak coupling regime is described by discrete quantum states. At strong interaction with the leads Kondo phenomena are observed as a function of a magnetic field. By varying gate voltages the electron droplet can, in addition, be distorted into a double quantum dot with a strong interdot tunnel coupling while keeping track of the number of trapped electrons. A widely tunable few electron droplet 2
منابع مشابه
3.9-4.8 μm gain-switched lasing of Fe:ZnSe at room temperature
We report a room temperature Fe:ZnSe laser in gain-switched operation and tuning over the 3.9 4.8μm spectral range. Mid-IR emission of Fe:ZnSe was studied under three regimes of excitation: ordinary optical (2.92μm) excitation of T2 excited state of Fe; excitation via E level of Cr co-dopant (1.56μm); and excitation via photo-ionization transition of Fe (0.532μm). The energy transfer from Cr (E...
متن کاملLight well: a tunable free-electron light source on a chip.
The passage of a free-electron beam through a nanohole in a periodically layered metal-dielectric structure creates a new type of tunable, nanoscale radiation source--a "light well". In the reported demonstration, tunable light is generated at an intensity of approximately 200 W/cm(2) as electrons with energies in the 20-40 keV range are injected into gold-silica well structures with a lateral ...
متن کاملNano Particles of Blueberry in Inulin and b-Cyclodextrin Microencapsules
In this study, blueberry essential oil as a core material was microencapsulated with Inulin and β-cyclodextrin at a ratio of 1:5 (core: wall). Oil in water nano-emulsions were prepared by ultrasonic liquid processors and then transformed to encapsulate powder in spray dryer. Dried powder was stored at 4 ˚C in refrigerator for determining moisture, encapsulation efficiency and morphology prop...
متن کاملWidely tunable two-colour seeded free-electron laser source for resonant-pump resonant-probe magnetic scattering.
The advent of free-electron laser (FEL) sources delivering two synchronized pulses of different wavelengths (or colours) has made available a whole range of novel pump-probe experiments. This communication describes a major step forward using a new configuration of the FERMI FEL-seeded source to deliver two pulses with different wavelengths, each tunable independently over a broad spectral rang...
متن کاملFigure of Merit and Limiting Characteristics of Tunable Ferroelectric Microwave Devices
Microwave application of ferroelectrics is very promising for electrically tunable microwave devices based on the electric field dependence of the dielectric permittivity. Tunable filters and controllable phase shifters are successfully designed as integrated circuits based on multilayer structures containing thin epitaxial ferroelectric (FE) film. As a rule lumped ferroelectric capacitors are ...
متن کامل