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arXiv 1408.0746cond-mat.mes-hallcond-mat.str-el
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自旋轨道相互作用对量子点接触中0.7反常的影响

Effect of spin-orbit interactions on the 0.7 anomaly in quantum point contacts

Olga Goulko, Florian Bauer, Jan Heyder, Jan von Delft

摘要:

我们研究了在零温度下有和没有电子-电子相互作用的系统中,量子点接触的电导如何受到自旋-轨道相互作用的影响。在存在自旋-轨道耦合的情况下,调节外部磁场的强度和方向可以改变色散关系,从而改变点接触区域中的局域态密度。这改变了电子-电子相互作用的效果,意味着0.7异常的形状发生了显著变化,并在第一个电导步骤中引入了额外的独特特征。

英文摘要:

We study how the conductance of a quantum point contact is affected by spin-orbit interactions, for systems at zero temperature both with and without electron-electron interactions. In the presence of spin-orbit coupling, tuning the strength and direction of an external magnetic field can change the dispersion relation and hence the local density of states in the point contact region. This modifies the effect of electron-electron interactions, implying striking changes in the shape of the 0.7-anomaly and introducing additional distinctive features in the first conductance step.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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