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中文摘要：
采用量子波导理论,研究了介观结构中杂质对透射几率和持续电流的影响.结果发现持续电流的大小不仅依赖于结构中环的尺度,而且也受到杂质的影响,杂质势既可以产生电流放大也可压制持续电流的放大.通过调节杂质的势来控制持续电流.
英文摘要：
Based on quantum waveguide theory,the effect of impurities on the transmission probability and the persistent currents in mesoscopic structure is studied. It is found that the persistent currents not only depend on the sizes of the rings but also are influenced by the impurities. Moreover,the impurity potential may help the enhancement of current magnification and also can suppress the amplitude of persistent current. The persistent currents can be controlled by adjusting the impurity potential.
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