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Nodal Pattern Analysis of Electron Transfer in a Quantum Ring under a Magnetic Field
Mitsuyoshi Tomiya,Shoichi Sakamoto,Masaki Nishikawa 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
In this work, we numerically study electron transfer in two-dimensional quantum rings (QRs) by using a wavefunctional nodal pattern analysis. Recent progress in experimental techniques for nanostructures has enabled precise control of the electron number in a two-dimensional system such as a single-electron transistor. One interest in electron transport in nano-devices is to determine the characteristics of a resistance in an external magnetic field. In a microwave (MW) environment, especially, the resistance has unique behaviors under a weak magnetic field. From a nodal pattern analysis, we found that not all states could contribute to the electron transfer. We also found the wavefunctions that stick to the innerwall of the QR under a weak magnetic field, which implies that the transfer depends in the relation between the ring size of the inner hole and the cyclotron radius of an electron motion. Consequently, the resistance is affected by the MW drive and a possibility exists to excite the electron to higher eigenstates.