The Persistent Currents in the Triple-arm Ring with an Impurity

HUO Shu-fen; XIAO Jing-lin

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The Persistent Currents in the Triple-arm Ring with an Impurity

paper | 更新时间：2020-08-12

- The Persistent Currents in the Triple-arm Ring with an Impurity
- Chinese Journal of Luminescence Vol. 30, Issue 5, Pages: 692-696(2009)
- 作者机构：
  
  内蒙古民族大学物理与电子信息学院, 内蒙古通辽 028043
- 作者简介：
- 基金信息：
- DOI：
  CLC： O472.4;O469
- Received：23 December 2008，
  
  Revised：02 January 1900，
  
  Published Online：30 October 2009，
  
  Published：30 October 2009
- 稿件说明：
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HUO Shu-fen, XIAO Jing-lin. The Persistent Currents in the Triple-arm Ring with an Impurity[J]. Chinese journal of luminescence, 2009, 30(5): 692-696.
DOI：

HUO Shu-fen, XIAO Jing-lin. The Persistent Currents in the Triple-arm Ring with an Impurity[J]. Chinese journal of luminescence, 2009, 30(5): 692-696. DOI：

摘要

采用量子波导理论

研究了含杂质的介观三臂环中的持续电流。结果表明:输运电流存在时

不含磁场的三臂环中也可有持续电流产生

这是纯的量子现象。即使含杂质的三臂环和含杂质的单环上、下臂比例相同

两环中的电流也明显不同。更重要的是发现在某些能量范围内

杂质不总是制约持续电流的增大。

Abstract

Recently

development of fabrication techniques has made possible for the dimensions of a structure to be much smaller than its characteristic lengths

such as mean free path and phase-coherence length of an electron. Such structure is referred to as mesoscopic system. The physical properties of the mesoscopic system are so affected by quantum-interference effects strongly that this system exhibits many novel phenomena. One of the intriguing phenomena is the persistent current in quantum rings threaded by magnetic flux. Prior to the experimental observation

Büttiker

Imry and Landauer suggested that the existence of persistent current is in an ordered one-dimension ring threaded by magnetic flux. Since the discovery of the persistent current

there have been many studies on the single ring

coupled ring and multiple-arm ring structures. It was shown that

in the presence of a transport current

the persistent current can flow in a ring

even in the absence of a magnetic field. The purpose of this paper is to study persistent currents in the triple-arm ring with an impurity by using quantum waveguide theory. It was found that in the presence of the transport current the persistent current arises in such structure even in the absence of magnetic field

beside

the persistent current in the triple-arm ring with an impurity and the single ring with an impurity are different

even though the ratio of the upper arm to the lower arm is same for the two cases. More importantly

It was shown that the impurity does not always suppress the amplitude of persistent current at some energy ranges.

关键词

Keywords

references

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College of Physics and Electromechanics, Inner Mongolia National University, Tongliao 028043, China

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