Admittance of CdS nanowires embedded in porous alumina template

CdSnanowires of 10nm diameter, electrodeposited in porous alumina films, had shown a conductance bistability in the past [Appl. Phys. Lett.76, 460 (2000)]. The conductance has a high (ON) and a low (OFF) state. In the ON state, different sets of nanowires display qualitatively different relation between the conductance and capacitance. We propose a model to explain this anomalous behavior. Based on this model, we predict that the inelastic mean free path of electrons in the nanowires is 3–3.5nm at room temperature. This short mean free path may be a consequence of acoustic phonon confinement

Proposed model for bistability in nanowire nonvolatile memory

Cadmium sulfide nanowires of 10‐nm diameter, electrodeposited in porous anodic alumina films, exhibit an electronic bistability that can be harnessed for nonvolatile memory. The current–voltage characteristics of the wires show two stable conductance states that are well separated (conductances differ by more than four orders of magnitude) and long lived (longevity\u3e1 yr at room temperature). These two states can encode binary bits 0 and 1. It is possible to switch between them by varying the voltage across the wires, thus “writing” data. Transport behavior of this system has been investigated at different temperatures in an effort to understand the origin of bistability, and a model is presented to explain the observed features. Based on this model, we estimate that about 40 trapped electrons per nanowire are responsible for the bistability

THz Josephson Spectroscopy of Mode Coupling in Split-Ring Resonators

Resonance modes in a planar square split-ring resonator (SRR) have been studied by Josephson spectroscopy at frequencies from 150 GHz to 800 GHz and excitation of fundamental modes in internal and external resonators have been observed. In addition, a square open-loop resonator (OLR) of the same dimension as the external resonator of the SRR has been analyzed, and red shift of the low-frequency resonance mode in SRR has been demonstrated

Frequency characterization of individual open-ring resonators by terahertz Josephson spectroscopy

Excitation of various resonance modes in a square open-loop resonator was studied by Josephson spectroscopy. A copper resonator with a side of a square of 233 μm was fabricated. Changing the position of the resonator with respect to a bicrystal YBa 2 Cu 3 O 7-x Josephson junction, a number of resonances was observed in measured spectra with the center frequencies from 78 GHz to 218 GHz. Measured data were compared with the results of a numeric simulation using an equivalent circuit of the resonator interacting with the junction. Resonance frequencies were obtained by fitting of calculated characteristics to the measured ones. According to the geometry of electric and magnetic field distributions for each position of the resonator, resonances observed were ascribed to excitation of fundamental magnetic and plasmonic modes