Indefinite optical properties, which are typically characterized by hyperbolic dispersion relations, have not been observed in naturally occurring materials, but can be realized through a metamaterial approach. We present here the design, fabrication and characterization of nanowire metamaterials with indefinite permittivity, in which all-angle negative refraction of light is observed. The bott...

We report measurements on a silicon nanowire quantum dot with a clarity that allows for a complete understanding of the spin states of the first four holes. First, we show control of the hole number down to one. Detailed measurements at perpendicular magnetic fields reveal the Zeeman splitting of a single hole in silicon. We are able to determine the ground-state spin configuration for one to f...

Spin qubits in germanium are a promising contender for scalable quantum computers. Reading out of the spin and charge configuration dots formed Ge/Si core/shell nanowires is typically performed by measuring current through nanowire. Here, we demonstrate more versatile approach on investigating these dots. We employ high-impedance, magnetic-field resilient superconducting resonator based NbTiN c...

Nowadays, modern scientific research has sparked a renewed interest to study the interaction of electromagnetic field (EM) with magnetic nanostructures and in particular nanophotonics spintronics. The current work is devoted an ab initio magneto-optical properties step-decorated oxide Co nanowires (1D oxides) on vicinal Pt surfaces. Theoretical calculations moments are based spin-polarized dens...

We demonstrate that a suspended nanowire forming a weak link between two superconductors can be cooled to its motional ground state by a supercurrent flow. The predicted cooling mechanism has its origins in magnetic field induced inelastic tunneling of the macroscopic superconducting phase associated with the junction. Furthermore, we show that the voltage drop over the junction is proportional...

We present a hybrid semiconductor-based superconducting qubit device which remains coherent at magnetic fields up to 1 T. The transition frequency exhibits periodic oscillations with field, consistent interference effects due the flux threading cross section of proximitized semiconductor nanowire junction. As induced superconductivity revives, additional modes emerge high fields, we attribute i...

Arrays of semimetallic Bi nanowires, fabricated by electrodeposition, exhibit strong finite-size effects in transport properties as the carrier mean-free path is limited by the wire dimensions. We have observed a resistivity enhancement, a very large positive magnetoresistance, and a resistance maximum that depends on the strength and orientation of the magnetic field and the nanowire diameter....

Magneto-optical techniques are key tools for the characterization of magnetic effects at a nanoscale. Here, we present dark-field magneto-optical Kerr effect (DFMOKE), technique have recently developed three-dimensional nanostructures. We introduce principles DFMOKE, based on separation an incident beam into multiple reflected beams when focusing 3D nano-geometry. show modifications needed in s...

We study the g-factor of discrete electron states in InAs nanowire based quantum dots. The g values are determined from the magnetic field splitting of the zero bias anomaly due to the spin 1/2 Kondo effect. Unlike to previous studies based on 2DEG quantum dots, the g-factors of neighboring electron states show a surprisingly large fluctuation: g can scatter between 2 and 18. Furthermore electr...

Title of Document: DESIGN AND PACKAGING OF AN IRONGALLIUM (GALFENOL) NANOWIRE ACOUSTIC SENSOR FOR UNDERWATER APPLICATIONS Rupal Jain, Master of Science, 2007 Directed By: Associate Professor F. Patrick McCluskey, Department of Mechanical Engineering A novel acoustic sensor incorporating cilia-like nanowires made of magnetostrictive irongallium (Galfenol) alloy has been designed and fabricated u...