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首页> 外文会议>International Conference on High Magnetic Fields in Semiconductor Physics; 20040802-06; Tallahassee,FL(US) >MAGNETOCONDUCTANCE THROUGH A CHAIN OF RINGS IN THE PRESENCE OF SPIN-ORBIT INTERACTION
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MAGNETOCONDUCTANCE THROUGH A CHAIN OF RINGS IN THE PRESENCE OF SPIN-ORBIT INTERACTION

机译：自旋-轨道相互作用下通过环的磁导

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摘要

Ballistic electron transport through a finite chain of quantum circular rings is studied in the presence of the Rashba coupling, of strength α, and of a perpendicular magnetic field B. The transmission and reflection coefficients for a single ring, obtained analytically, help obtain the conductance through a chain of rings as a function of the strength α, the field B, and of the wave vector k of the incident electron. Due to destructive spin interferences caused by the Rashba coupling the chain can be totally opaque for certain ranges of k the width of which depends on values of α and B. Outside these ranges the conductance oscillates with high values between e~2/h and 2e~2/h. The effect of a periodic modulation of α or B on the conductance gaps is investigated. A periodic, square-wave conductance pattern, pertinent to the development of the spin transistor, results within wide stripes in the parameter space spanned by k, α, and B. Finite temperatures smoothen the square-wave profile of the conductance but do not alter its periodic character.
机译：研究了在存在Rashba耦合，强度α和垂直磁场B的情况下，通过量子圆环有限链的弹道电子传输。通过分析获得的单个环的透射和反射系数有助于获得电导根据强度α，场B和入射电子的波矢k的变化通过一圈环。由于Rashba耦合引起的破坏性自旋干扰，在一定范围内的k宽度完全取决于α和B的值的k范围内，该链可能是完全不透明的。在这些范围之外，电导在e〜2 / h和2e之间以高值振荡〜2 / h。研究了α或B的周期性调制对电导间隙的影响。与自旋晶体管的发展有关的周期性方波电导模式会在由k，α和B跨越的参数空间中出现宽条纹内。有限的温度会使电导的方波曲线平滑，但不会改变它的周期性特征。

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