Electronic Persistent Currents Research Articles

A novel approach for generating giant electronic persistent currents in symmetric defect mesoscopic-ring networks

According to optical analogy of electrons' behavior in mesoscopic systems, we change optical symmetric defect waveguide networks being able to create strong photonic localizations into electronic symmetric defect mesoscopic-ring networks (SDMRNs) being capable of generating giant electronic persistent currents. These simple SDMRNs can produce giant electronic persistent currents in the absence of magnetic field, stub, and impurity. We give out the sufficient condition for generating maximum electronic persistent current |Jp|max in SDMRNs and obtain the formula of |Jp|max. It is found that |Jp|max is proportional to the inverse square of the breaking degree of defect, Δd. Our results may deepen one's knowledge on the correlation between photonic and electronic networks and may be useful for the designing of microcircuits with large electric current.

Strong Photonic Localizations Generated in Single-Optical-Waveguide Ring

In this paper, an extreme simple single-optical-waveguide ring (SOWR) is designed to generate strong photonic localizations by considering the similarities between electrons in electronic mesoscopic networks and photons in optical waveguide networks (OWNs). This interesting structure is designed based on the single-electronic-mesoscopic ring that can produce huge electronic persistent currents. We obtain the fitting formulas of the intensity, site number, and site positions for the maximal photonic localization in a SOWR. These interesting SOWRs may provide attractive applications like multichannel high-efficiency energy storages, high power super luminescent light emitting diodes, optical switches, and other correlative all-optical devices. Moreover, the approach of referencing single-electronic-mesoscopic ring to design SOWR may offer a new way to devise optical structures being capable of producing strong photonic localizations and may also deepen people's knowledge on the correlation between OWN and the electronic mesoscopic network.

Mesoscopic phenomena in Bose-Einstein systems: Persistent currents, population oscillations, and quantal phases

Mesoscopic phenomena---including population oscillations and persistent currents driven by quantal phases---are explored theoretically in the context of multiply connected Bose-Einstein systems composed of trapped alkali-metal gas atoms. These atomic phenomena are bosonic analogs of electronic persistent currents in normal metals and Little-Parks oscillations in superconductors. Differences between oscillatory phenomena due to quantal phases in Bose-Einstein systems and in conventional superconductors are discussed, particularly with regard to their potential for discriminating between the standard BCS scenario and the Bose-Einstein condensation of preformed pairs scenario for the superconducting transition in high-temperature superconductors.

A possible explanation for the discrepancy in electron persistent current amplitudes: A superfluid persistent current analog

Recently there has been considerable interest in normal electron “persistent currents” which result from the wave nature of electrons in a normal metal ring for which inelastic electron-phonon scattering has been reduced so that the electron maintains phase coherence around the ring. The application of the current theory of electron transport, which includes the effects of elastic scattering in a disordered potential field, produces an expression which disagrees with the experimental measurements by Webb, et al. In this paper we present an acoustic analog of wave mechanical electrons in a disordered circular waveguide and derive an expression which agrees with the results of the electron persistent current measurements. The acoustic analog shows that the expression derived from electron transport is also correct, but only under conditions which do not correspond to the actual method used in measuring the electron persistent currents. A proposed experiment to test the model using superfluid helium in a disordered scattering field will be presented.