Electron position: jumping in double concentric quantum rings

2011 ◽  
Vol 1370 ◽  
Author(s):  
I. Filikhin ◽  
S. Matinyan ◽  
J. Nimmo ◽  
B. Vlahovic
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Level Structure ◽  
Three Dimensional ◽  
Semiconductor Heterostructures ◽  
Quantum Ring ◽  
Energy Level Structure ◽  
Quantum Rings ◽  
Field Influence ◽  
Effective Mass Approach

ABSTRACTSemiconductor heterostructures as quantum dots or quantum rings (QR) demonstrate discrete atom-like energy level structure. In an atom the position of an electron can be changed by electromagnetic field influence with accompaniment of quantum number change. In present work we show that in the weak coupled Double Concentric Quantum Ring (DCQR), the electron jumping is possible due to tunneling accompanied with level anti-crossing which has a place in a magnetic field. We study DCQR composed of GaAs in an Al0.70Ga0.30As substrate under influence of a magnetic field. In our model the DCQR is considered within three dimensional single sub-band effective mass approach. When a magnetic field is applied in the z direction, perpendicular to the DCQR plane. The results of the numerical calculations for DCQR are presented for DCQRs of different geometry.

Three-Dimensional Automatic Measurements System for RFID Magnetic Field

2011 ◽  
Vol 298 ◽  
pp. 278-281
Author(s):  
Wei Dong Hu ◽  
Pei Juan Wu
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Three Dimensional ◽  
Experimental Measurements ◽  
Rfid Technology

RFID has been applied extensively, but there is no an effective method to measure the electromagnetic distribution above the reader. In order to give the accurate value of the electromagnetic field, a three-dimensional automatic measurements system is designed. Both theoretic simulation and experimental measurements have shown that the system will play an important role in RFID technology.

Electron Localization, Tunneling and Energy Spectrum for Systems of Double Quantum Dots

2013 ◽  
Vol 1551 ◽  
pp. 129-134
Author(s):  
Igor Filikhin ◽  
Sergei Matinyan ◽  
Branislav Vlahovic
Keyword(s):  
Quantum Dots ◽  
Electron Tunneling ◽  
Level Structure ◽  
Semiconductor Heterostructures ◽  
Double Quantum ◽  
Quantum Object ◽  
Energy Level Structure ◽  
Double Quantum Dots ◽  
Quantum Objects ◽  
Identical Quantum

ABSTRACTSemiconductor heterostructures as quantum dots demonstrate discrete atom-like energy level structure based on several hundred of electron confinement states. In the case of double QD (DQD) or double QR (DQR), there is a single electron spectrum composed of a set of quasi-doublets. We study these specific spectrum properties with their relation to the electron tunneling in DQD (DCQR) when the wave function of electron localized initially in one of the double quantum object is spread into whole system. The double InAs/GaAs quantum dots are considered within the effective approach. Tunneling in DQD is studied in connection with change of inter-dot distance and QD geometry. There are two types of such tunneling in DQD. The first is related to tunneling in the system of two identical QDs; the second one occurs in the system of non-identical QDs. The tunneling in the DQR is a tunneling in the system with non-identical quantum objects. The quasi-doublets of the DQD spectrum play an important role in the tunneling. We study effect of violation of symmetry of DQD geometry on the tunneling and show that the violation of symmetry makes difficulties for such tunneling.

Magnetic Field Effects on Electron Eigenstates in a Concentric Triple Quantum Ring

2010 ◽  
Vol 10 ◽  
pp. 121-130 ◽  
Author(s):  
Hojjatollah K. Salehani ◽  
Mahdi Esmaeilzadeh ◽  
Khosrow Shakouri
Keyword(s):  
Magnetic Field ◽  
Energy Levels ◽  
Quantum Ring ◽  
Dimensional System ◽  
Magnetic Field Effects ◽  
Donor Impurity ◽  
Quantum Rings ◽  
Hydrogenic Donor Impurity ◽  
Hydrogenic Donor ◽  
The Magnetic Field

In this paper, the electronic eigenstates and energy spectra of a two-dimensional system formed by three concentric, coupled, semiconductor quantum rings with a perpendicular magnetic field in the presence and the absence of a single ionized hydrogenic donor impurity are studied. It is found that the magnetic field localizes the electron wave function in the inner rings. The effects of hydrogenic donor on the electronic structure of concentric triple quantum rings are investigated in the both on- and off-center configurations. It is shown that as the donor moves away from the center of the system, the ground state energy decreases monotonically, the degeneracy is lifted and the gap between the energy levels increases. Also, the binding energy of donor impurity increases with increasing magnetic field.

scholarly journals Three-Dimensional Numerical Visualization And Simulation of Multiphysics in Point Source Dc Magnetometric Resistivity Method

2020 ◽  
Author(s):  
Wenlong Gao ◽  
Lei Zhou ◽  
Liangjun Yan
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Point Source ◽  
Three Dimensional ◽  
Theoretical Method ◽  
Potential Method ◽  
Resistivity Method ◽  
Physics Simulation ◽  
Visualization And Simulation ◽  
Numerical Calculation Method

Magnetometric Resistivity(MMR) Method, which can use the power supply method of the traditional apparent resistivity method to measure the magnetic field. At present, the application research abroad is relatively extensive, but the domestic(China) research on the application of the MMR method is very few, and it is not even well-known. This paper is based on the MMR theoretical method under the point source DC condition, combined with the abnormal potential method and the modified Biot-Savart law, and using the three-dimensional numerical calculation method of the finite difference method to calculate the abnormal potential field, electric field, and magnetic field on the matlab2018a platform. Calculate, realize the multi-physics simulation in the electromagnetic field through Matlab platform programming, and verify the correctness of the algorithm by the spherical anomaly model with an analytical solution. Through the visual simulation of the three-dimensional data volume of the multi-physics field in the electromagnetic field, we can better understand the response mechanism of the electromagnetic field under DC conditions and grasp their three-dimensional spatial distribution rules. It is hoped that the research in this article can help the research of MMR Personnel better use this method for exploration.

scholarly journals Study on electromagnetic environment analysis and lightning protection in buildings

2021 ◽  
Vol 233 ◽  
pp. 03054
Author(s):  
Gen Ye ◽  
Yufa Lu ◽  
Guirong Yang ◽  
Weichao Chen
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Three Dimensional ◽  
Lightning Protection ◽  
Electromagnetic Environment ◽  
Distribution Law ◽  
Protection Measures ◽  
Environment Analysis ◽  
Lightning Strikes ◽  
Steel Bar

When a direct strike occurs, the lightning surge current will intrude into the steel frame and steel bar of the building, forming a high lightning electromagnetic environment inside the building, which will affect the telecommunications equipment set in the building. Therefore, the problem of lightning protection in buildings becomes more and more important. In this paper, by studying the distribution law of lightning electromagnetic field in buildings, the intensity of magnetic field generated in buildings under different lightning strikes is analyzed. According to the three-dimensional diagram and equivalent diagram of the intensity of lightning magnetic field in each case, when the building encounters direct lightning, the lightning electromagnetic field is the strongest near the leadoff line, and the middle zone is weak. The lightning protection measures inside the building are put forward.

Artificial molecular quantum rings under magnetic field influence

2009 ◽  
Vol 106 (7) ◽  
pp. 073702 ◽  
Author(s):  
L. K. Castelano ◽  
G.-Q. Hai ◽  
B. Partoens ◽  
F. M. Peeters
Keyword(s):  
Magnetic Field ◽  
Quantum Rings ◽  
Field Influence

Possible Interactions Between Stent and Electromagnetic Field

2018 ◽  
Vol 3 (2) ◽  
pp. 48-51
Author(s):  
Cristian Barz ◽  
Marek Petters ◽  
Adam Dorsz ◽  
Przemysław Syrek
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Bone Fractures ◽  
Electrical Power ◽  
Three Dimensional ◽  
Low Frequency ◽  
The Past ◽  
Magnetic Coils ◽  
The Impact ◽  
The Magnetic Field

Over the past years, an increase in the amount of the electromagnetic sources could be observed. Model presented in this article is limited to the impact of low frequency fields generated by the e.g. electrical power lines or magnetic coils in a bone fractures therapy. Particularly, the effect of the magnetic component of the electromagnetic field on stents will be evaluated. The conductivity of human tissues will be investigated. Yielded results will be used to simplify complicated, three-dimensional problem of the current distribution in stent branches, to one-dimensional one. The merits of the paper is proposing, implementing and using for analysis a numerical model of the stent in magnetic field. The impact of frequency and positioning of stent in the magnetic field will be investigated and current distributions found.

Energy level structure and optical dephasing under magnetic field in Er3+:LiYF4 at 1.5 μm

2016 ◽  
Vol 169 ◽  
pp. 478-482 ◽  
Author(s):  
Robert Marino ◽  
Ivan Lorgeré ◽  
Olivier Guillot-Noël ◽  
Hervé Vezin ◽  
Alessandra Toncelli ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Energy Level ◽  
Level Structure ◽  
Energy Level Structure ◽  
Optical Dephasing
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