4 research outputs found
SQUIPT - Superconducting Quantum Interference Proximity Transistor
We present the realization and characterization of a novel-concept
interferometer, the superconducting quantum interference proximity transistor
(SQUIPT). Its operation relies on the modulation with the magnetic field of the
density of states of a proximized metallic wire embedded in a superconducting
ring. Flux sensitivities down to Hz can be
achieved even for a non-optimized design, with an intrinsic dissipation ( fW) which is several orders of magnitude smaller than in conventional
superconducting interferometers. Our results are in agreement with the
theoretical prediction of the SQUIPT behavior, and suggest that optimization of
the device parameters would lead to a large enhancement of sensitivity for the
detection of tiny magnetic fields. The features of this setup and their
potential relevance for applications are further discussed.Comment: 5+ pages, 5 color figure
Evidence of phonon-assisted tunnelling in electrical conduction through DNA molecules
We propose a phonon-assisted tunnelling model for explanation of conductivity
dependence on temperature and temperature-dependent I-V characteristics in
deoxyribonucleic acid (DNA) molecules. The capability of this model for
explanation of conductivity peculiarities in DNA is illustrated by comparison
of the temperature dependent I-V data extracted from some articles with
tunnelling rate dependences on temperature and field strength computed
according to the phonon-assisted tunnelling theory.
PACS Codes: 87.15.-v, 71.38.-k, 73.40.GkComment: 6 pages, 3 figure