We report on ohmic contact measurements of Al, Au, and W metallizations to p-type epitaxial Ge0:9983C0:0017 grown on a (100) Si substrate by molecular beam epitaxy (MBE). Contacts were annealed at various temperatures, and values of specific contact resistance have been achieved which range from 10 5 cm2 to as low as 5:6 10 6 cm2. Theoretical calculations of the contact resistance of metals on ...

The dependence of contact resistance on current has been measured for a large number of ohmic contacts to quantized Hall resistors under quantum Hall effect conditioDS.Five different functional forms of current dependence are observed at low currents. The trend from best to worst quality can be correlated with the density of defects in the contact, regardless of the physical cause of the defect...

An analytic ground state is proposed for the unbiased spin-boson Hamiltonian, which is non-Gaussian and beyond the Silbey-Harris ground state with lower ground state energy. The infrared catastrophe in Ohmic and sub-Ohmic bosonic bath plays an important role in determining the degeneracy of the ground state. We show that the infrared divergence associated with the displacement of the nonadiabat...

The stability of a high 3 tokamak with a superimposed single helicity stellarator field is investigated in the context of the sharp boundary surface current model. The analysis treats external ideal magnetohydrodynamic modes including both pressure-driven ballooning effects and current-driven kink instabilities. The results show that the addition of an i = 2 field is unfavorable, lowering the a...

In this paper we investigate the short-time decoherence from Ohmic and 1/f noise of single Josephson charge qubit (JCQ). At first, we use the short-time approximation to obtain the dynamics of the open JCQ. Then we calculate the decoherence the measure of which is chosen as the maximum norm of the deviation density operator. It is shown that the decoherence from 1/f noise plays the central role...

Vibrational heat transport in molecular junctions is a central issue different contemporary research areas such as chemistry, materials science, mechanical engineering, thermoelectrics, and power generation. Our model system consists of chain molecules which are sandwiched between two solids that maintained at temperatures. We employ quantum self-consistent reservoir model, built on generalized...

Many electrochemical energy-conversion systems are evaluated by polarization curves, which report the cell voltage across a range of current densities and global measure operation state health. Mathematical models can be used to deconstruct measured overall identify quantify voltage-loss sources, such as kinetic, ohmic, mass-transport effects. These results elucidate best pathways for improved ...

The InAlAs/InGaAs metamorphic HEMT (mHEMT) two-stage Ka-band amplifier and DC-30 GHz distributed SPST switch were designed and fabricated using low-k benzocyclobutene (BCB) bridged technology. This fabrication technology takes the advantages of its low dielectric permittivity (2.7), low loss tangent (0.008), low curing temperature, low water up-take, and simple manufacturing process. The MMIC f...