HUO Shu-fen, XIAO Jing-lin. Effect of Magnetic Field on Persistent Currents in Mesoscopic Structure with an Impurity[J]. Chinese Journal of Luminescence, 2008,29(2): 225-228
HUO Shu-fen, XIAO Jing-lin. Effect of Magnetic Field on Persistent Currents in Mesoscopic Structure with an Impurity[J]. Chinese Journal of Luminescence, 2008,29(2): 225-228DOI:
Effect of Magnetic Field on Persistent Currents in Mesoscopic Structure with an Impurity
Recent developments of fabrication techniques have made available structure whose dimensions are much smaller than the characteristic length
such as mean free path and phase-coherence length of an electron. These structures are referred to as mesoscopic system. The physical properties of the mesoscopic system are strongly affected by quantum-interference effects
and one of the interesting phenomena is the persistent current in a ring threaded by magnetic flux. The purpose of this paper is to reveal the behavior of the persistent currents of mesoscopic structure with an impurity by the quantum waveguide theory. It is found that both the transmission coefficient of electron and persistent currents oscillate periodically with changing of magnetic flux with a period of ƒ=1. In the region of 0≤ƒ<1
the antiresonance occurs at ƒ=0.5. When the flowing direction of the current reverses
the amplitude of persistent current in each ring of the double Aharonov-Bohm rings changes.
关键词
量子波导理论介观结构δ-函数杂质持续电流
Keywords
quantum waveguide theorymesoscopic structureδ-function impuritypersistent current
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