Fractional magnetic flux transition in two-band single-junction superconducting rings

2019 ◽  
Vol 33 (05) ◽  
pp. 1950054
Author(s):  
Hai Huang ◽  
Jian-Jiang Zhang ◽  
Xia Huang
Keyword(s):  
Magnetic Flux ◽  
Phase Difference ◽  
Soliton Solution ◽  
Electromagnetic Properties ◽  
Current Phase ◽  
Ginzburg Landau ◽  
Single Junction ◽  
Superconducting Ring ◽  
Circulating Current ◽  
Junction Structure

Based on Ginzburg–Landau (GL) theory, we study the electromagnetic properties of two-band superconducting ring with a microbridge structure. The phase difference of two-order parameters in two-band superconductors satisfies the sine-Gordon equation, and from its soliton solution, the linear relation between the phase difference at both ends of the junction and total magnetic flux in the ring can be obtained. Then with the Josephson current-phase relation in the two-band superconducting microbridge, we establish the dependence of the circulating current and total magnetic flux on the applied external magnetic field. Our analysis shows that the soliton solution and the fractional flux quantization in two-band superconductors can be verified by measuring the properties of this single-junction structure.

scholarly journals Current-phase relation in layered superconducting structures of SIS’IS type

2021 ◽  
Vol 24 (2) ◽  
pp. 23701
Author(s):  
A. M. Shutovskyi ◽  
V. E. Sakhnyuk
Keyword(s):  
Phase Difference ◽  
Current Density ◽  
Phase Relation ◽  
Dielectric Layer ◽  
Intermediate Layer ◽  
Order Parameter ◽  
Constant Function ◽  
Piecewise Constant Function ◽  
Current Phase ◽  
Piecewise Constant

The dependence of the current density on the phase difference is investigated considering the layered superconducting structures of a SIS’IS type. To simplify the calculations, the quasiclassical equations for the Green’s functions in a t-representation are derived. An order parameter is considered as a piecewise constant function. To consider the general case, no restrictions on the dielectric layer transparency and the thickness of the intermediate layer are imposed. It was found that a new analytical expression for the current-phase relation can be used with the aim to obtain a number of previously known results arising in particular cases.

Effect of Excitation Frequency on the Performance of Amorphous Silicon Alloy Solar Cells

1998 ◽  
Vol 507 ◽  
Author(s):  
J. Yang ◽  
S. Sugiyama ◽  
S. Guha
Keyword(s):  
Solar Cells ◽  
Glow Discharge ◽  
Amorphous Silicon ◽  
Excitation Frequency ◽  
Deposition Rates ◽  
Solar Cell Performance ◽  
Single Junction ◽  
Silicon Alloy ◽  
Double Junction ◽  
Junction Structure

ABSTRACTWe have studied amorphous silicon alloy solar cells made by using a modified-very-highfrequency glow discharge at 75 MHz with a deposition rate of ∼6 Å/s. The solar cell performance is compared with those made from conventional glow discharge at 13.56 MHz with lower deposition rates. Cells made at ∼6 Å/s with 75 MHz showed comparable stabilized efficiency to those made at ∼3 Å/s with 13.56 MHz. The best performance, however, was obtained with ∼1 Å/s, including a stabilized 9.3% a-Si alloy single-junction cell employing conventional glow discharge technique. Using 75 MHz, we have achieved 11.1% and 10.0% initial active-area efficiencies for a-Si alloy and a-SiGe alloy n i p cells, respectively. An initial efficiency of 11.0% has also been obtained in a dual bandgap double-junction structure.

scholarly journals Magnetic flux noise in the three-Josephson-junction superconducting ring

2008 ◽  
Vol 34 (6) ◽  
pp. 413-417 ◽  
Author(s):  
E. Il’ichev ◽  
A. N. Omelyanchouk
Keyword(s):  
Magnetic Flux ◽  
Josephson Junction ◽  
Superconducting Ring ◽  
Flux Noise

scholarly journals Флуктуационное образование фазовых солитонов в двузонных сверхпроводящих мостиках

2018 ◽  
Vol 60 (11) ◽  
pp. 2110
Author(s):  
П.М. Марычев
Keyword(s):  
Phase Difference ◽  
Landau Theory ◽  
Threshold Energy ◽  
The State ◽  
Single Band ◽  
Josephson Coupling ◽  
Phase Slip ◽  
Considerable Decrease ◽  
Ginzburg Landau ◽  
Interband Coupling

Abstract —Based on the Ginzburg–Landau theory, the dependence of the threshold energy δ F _thr of formation of a phase slip center from the current for a superconducting two-band bridge has been calculated. It has been found that, in the case of sufficiently long bridges and a weak interband Josephson coupling, there is a range of currents at which fluctuation transition from the state of the zero interband phase difference to the states with a phase soliton is possible, which manifests itself in a considerable decrease in the threshold energy δ F _thr, and a fluctuation change in the number of phase solitons in the bridge. In the case of a strong interband coupling, no fluctuation formation of phase solitons occurs and the dependence δ F _thr( I ) tends to the expression obtained earlier by Langer and Ambegaokar for a single-band superconductor.

Spontaneous magnetic-flux generation in superconducting ring

2001 ◽  
Vol 53 (2) ◽  
pp. 240-245 ◽  
Author(s):  
M Ghinovker ◽  
B. Ya Shapiro ◽  
I Shapiro
Keyword(s):  
Magnetic Flux ◽  
Superconducting Ring
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