Electronic delocalization and persistent currents in nonsymmetric-dimer mesoscopic rings threaded by magnetic flux

2004 ◽  
Vol 95 (11) ◽  
pp. 7545-7547 ◽  
Author(s):  
X. F. Hu ◽  
Z. H. Peng ◽  
R. W. Peng ◽  
Y. M. Liu ◽  
F. Qiu ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Persistent Currents ◽  
Electronic Delocalization

Energy Spectrum and Persistent Currents in Finite-Width Mesoscopic Ring with Radial Potential Barrier Threading a Magnetic Flux Through its Hole

1998 ◽  
Vol 12 (06) ◽  
pp. 663-672
Author(s):  
Ben-Yuan Gu ◽  
Wei-Dong Sheng ◽  
Jian Wang
Keyword(s):  
Energy Spectrum ◽  
Magnetic Flux ◽  
Potential Barrier ◽  
Coupling Effect ◽  
Finite Width ◽  
Persistent Currents ◽  
Tunneling Barrier ◽  
Radial Potential ◽  
Mesoscopic Ring

The energy spectrum and the persistent currents are calculated for a finite-width mesoscopic annulus with radial potential barrier, threading a magnetic flux through the hole of the ring. Owing to the presence of tunneling barrier, the coupling effect leads to the splitting of each radial energy subband of individual concentrical rings into two one. Thus, total currents and currents carried by single high-lying eigenstate as a function of magnetic flux exhibit complicated patterns. However, periodicity and antisymmetry of current curves in the flux still preserve.

Persistent Currents in a Normal Metallic Loop Connected with A Normal Metal and a Superconductor

1998 ◽  
Vol 12 (05) ◽  
pp. 181-191
Author(s):  
Zhiliang Cao ◽  
Yuannan Xie ◽  
Rushan Han
Keyword(s):  
Magnetic Flux ◽  
Andreev Reflection ◽  
Normal Metal ◽  
Flux Quantum ◽  
Persistent Currents ◽  
Electronic Part

We have studied the effect of the Andreev reflection on the persistent currents in a normal metallic loop connected with a normal metal and a superconductor. It consist of two parts, one contributed by electrons and one by holes. They are periodic with a period equal to a single flux quantum, ϕ0, versus the threading magnetic flux and π versus the length of the lead bridging between the loop and the superconductor. They have sharp peaks at the gap edge. Both the sum of persistent currents and the electronic part increase to a same constant, but the hole part decreases to zero with the barrier strength rising to infinity.

Persistent currents in k-component Fibonacci mesoscopic rings threaded by a magnetic flux

2002 ◽  
Vol 14 (30) ◽  
pp. 7253-7263 ◽  
Author(s):  
Y M Liu ◽  
R W Peng ◽  
G J Jin ◽  
X Q Huang ◽  
Mu Wang ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Persistent Currents

scholarly journals Электронные состояния и персистентные токи в кольцах с неоднородным спин-орбитальным взаимодействием Рашбы

2021 ◽  
Vol 55 (9) ◽  
pp. 719
Author(s):  
Г.М. Максимова ◽  
А.Р. Зайнагутдинов ◽  
А.В. Тележников
Keyword(s):  
Magnetic Flux ◽  
Coupling Parameter ◽  
Energy Levels ◽  
Spin Current ◽  
Spin Orbit Coupling ◽  
Persistent Currents ◽  
One Dimensional ◽  
Absolute Value ◽  
Ring Structures ◽  
Ring Axis

The paper considers one-dimensional isolated quantum rings in a perpendicular magnetic field, in which Rashba spin-orbit coupling parameter changes along the ring. Electronic spectra and persistent currents of such ring structures are calculated for different values of the structure parameters and the magnitude of the magnetic flux. It is shown that the inhomogeneity of the Rashba parameter leads to anticrossing of energy levels and smoothing of the dependence of the persistent charge current on the flux. The influence of inhomogeneity on the spin persistent current turns out to be more significant: the projection of the spin current on the ring axis ceases to be preserved when moving along the ring; additional extrema or zeros appear on the dependence of the absolute value of the spin current on the magnetic flux for a given number of electrons in the ring.

PERSISTENT CURRENTS DUE TO EVANESCENT MODES

1993 ◽  
Vol 07 (15) ◽  
pp. 1045-1051 ◽  
Author(s):  
P. SINGHA DEO ◽  
A.M. JAYANNAVAR
Keyword(s):  
Magnetic Flux ◽  
Density Of States ◽  
Persistent Current ◽  
Persistent Currents ◽  
Quantum Tunnelling ◽  
Metallic Ring ◽  
Bohm Effect ◽  
Aharonov Bohm ◽  
Special Case

We have calculated the persistent currents and the density of states in an open metallic ring connected to an electron reservoir in the presence of a magnetic flux. As a special case, we have considered the situation wherein electrons enter and leave the ring in a sub-barrier regime characterised by evanescent modes throughout the circumference of the ring. In such a situation, the persistent current arises due to two non-classical effects, namely, Aharonov-Bohm effect and quantum tunnelling.

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