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arXiv 1609.08294cond-mat.mes-hall
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隧道光谱中的能隙:化学势移动的影响

Energy gap in tunneling spectroscopy: effect of the chemical potential shift

N. I. Fedotov, S. V. Zaitsev-Zotov

摘要:

我们研究了化学势能级的移动对隧穿电导谱的影响。在能谱带隙的体系中,能隙区的微分隧穿电导曲线$dI/dV$出现了显著的化学势依赖性畸变。推导出一个表达式的校正的$dI/dV$,这在许多情况下被发现是大的。校正的符号取决于化学势水平相对于间隙的位置。与化学势位移相关的$dI/dV$的校正对尖端-样品分离$z$具有几乎线性的依赖性,并且在$z\to 0$处消失。

英文摘要:

We study the effect of a shift of the chemical potential level on the tunneling conductance spectra. In the systems with gapped energy spectra, significant chemical-potential dependent distortions of the differential tunneling conductance curves, $dI/dV$, arise in the gap region. An expression is derived for the correction of the $dI/dV$, which in a number of cases was found to be large. The sign of the correction depends on the chemical potential level position with respect to the gap. The correction of the $dI/dV$ associated with the chemical potential shift has a nearly linear dependence on the tip-sample separation $z$ and vanishes at $z\to 0$.

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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