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Conductance
About: Conductance is a research topic. Over the lifetime, 8088 publications have been published within this topic receiving 235961 citations.
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TL;DR: In this article, the authors show that the total conductance changes nonmonotonically with the magnetic field strength for different magnetic configurations, due to the precession of the spin accumulation in the normal metal.
Abstract: conductance of the system in the presence of a magnetic field can be asymmetric with respect to time reversal. The total conductance changes nonmonotonically with the magnetic field strength for different magnetic configurations. This modulation of the conductance is due to the precession of the spin accumulation in the normal metal. The difference between the conductance of the parallel and antiparallel configurations can be either positive or negative as a function of the applied magnetic field. This effect should be best observable on Al single crystals attached to ferromagnetic electrodes by means of tunnel junctions or metallic contacts.
84 citations
TL;DR: The dual-frequency method and independent flow signal can be used to provide absolute volumes in mice and the dominant source of V(p) in mice was found to be the left ventricular wall itself, since surrounding the heart in the chest with physiological saline or markedly varying right ventricular volumes had a minimal effect on the left vents signal.
Abstract: The conductance catheter method has substantially enhanced the characterization of in vivo cardiovascular function in mice. Absolute volume determination requires assessment of parallel conductance...
84 citations
TL;DR: It is found that the spacing between average values of lnτ(n) is constant and it is demonstrated that when surface interactions are taken into account it is equal to the inverse of the bare conductance.
Abstract: We measure the field transmission matrix t for microwave radiation propagating through random waveguides in the crossover to Anderson localization. From these measurements, we determine the dimensionless conductance g and the individual eigenvaluesn of the transmission matrix tt y whose sum equals g. In diffusive samples, the highest eigenvalue, � 1, is close to unity corresponding to a transmission of nearly 100%, while for localized waves, the average of � 1, is nearly equal to g. We find that the spacing between average values of lnn is constant and demonstrate that when surface interactions are taken into More than 50 years ago, Anderson (1) showed that beyond a certain threshold in disorder the electron wave function within a material becomes exponentially peaked and diffusion ceases. In the intervening years, localization and its precursors in diffusive samples of enhanced fluctu- ations and suppressed transmission have been shown to affect every aspect of transport (2-4). Relating transmis- sion in disordered systems to random matrices (5-12) has provided a powerful approach to calculating the scaling and fluctuations of conductance. In this approach, the flow of electrical current through a disordered conductor is assumed to proceed via a set of orthogonal channels on the input and output sides of the sample which are coupled via the field transmission matrix t. Each channel is a superposition of the N orthogonal transverse momentum channels supported by the sample leads. Alternatively, t gives the coupling of the field between different points on opposite surfaces of the sample. The focus of random matrix theory has been the calculation of the dimensionless conductance, g, which is the conductance in units of
84 citations
84 citations
TL;DR: In this article, an analysis on the conductance of multiwall carbon nanotubes (MWNTs) is presented, and it is shown that tunneling current between states on different walls of a defect-free, infinitely long MWNT is vanishingly small in general, which leads to the quantization of the MWNT's.
Abstract: An analysis on the conductance of multiwall carbon nanotubes (MWNT's) is presented. Recent experiment indicated that MWNT's are good quantum conductors. Our theory shows that tunneling current between states on different walls of a defect-free, infinitely long MWNT is vanishingly small in general, which leads to the quantization of the conductance of the MWNT's. With a reasonable simple model, we explicitly show that the conductance of a capped MWNT can be determined by the outermost wall for an infinitely long nanotube. We apply the theory to finite MWNT's and estimate the generic interwall conductance to be negligible compared to the intrawall ballistic conductance.
83 citations