Electron irradiation effects in silicon at liquid helium temperatures using AC hopping conductivity†

A SIMPLE MODEL OF ac HOPPING CONDUCTIVITY

The physics of ac hopping conduc2ivity in disordered solids is discussed in the light of a recently proposed model. Several new comments are made. One of the most interesting facts about conductivity in disordered solids is the surprising similarity between ionic and electronic conductivity. The same kinds of non-linearities in strong electric fields are observed, and ionic and electronic condu...

Static Current-Voltage Characteristics of Silicon n+-i-n+ Resistors at Liquid Helium Temperatures

The behaviour of the (I-V) characteristics is investigated in n+-i-n+ highly compensated Si resistors at temperatures 4.2-45K. The conduction mechanisms are discussed in detail here. The prebreakdown and breakdown regions of I-V characteristics were simulated by a one-dimensional model including the evidence of impurity high compensation and freeze out effects as well as the shallow-dopants imp...

Investigations of Solid-Liquid Interfaces in Helium at Ultralow Temperatures

This Thesis describes ultralow temperature studies of helium quantum crystals. Owing to the surrounding superfluid, small latent heat of crystallization and correspondingly short relaxation times, which are unreachable in ordinary crystals, helium crystals offer a unique and clean modeling system to study surface phenomena in a solid. The measurements of the crystal shape and growth rates are e...

Stressed silicon nitride nanomechanical resonators at helium temperatures

High-resolution electron microscopy with superconducting lenses at liquid helium temperatures.

Following our first successful imaging experiments'-3 with high-field superconducting solenoid lenses, numerous methodological and conceptual problems remained to be solved before the specific advantages of this approach could be adequately established for high-resolution electron microscopy. These problems included: (a) incorporation of superconducting solenoid lenses and associated cryogenic ...