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arXiv 1302.2670cond-mat.mes-hall
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欧姆接触对量子霍尔边缘态的平衡

Equilibration of quantum Hall edge states by an Ohmic contact

Artur O. Slobodeniuk, Ivan P. Levkivskyi, Eugene V. Sukhorukov

摘要:

欧姆接触是电子光学中的关键元件,但至今尚未得到明确的理论描述。我们提出了一个模型的欧姆接触作为一片金属的有限电容$C$附加到量子霍尔边缘。结果表明,在欧姆接触中,带电的量子霍尔边缘态可能与中性激发有弱耦合。因此,尽管是中性激发的储存器,但是如果欧姆接触的温度小于$\hbarΩ_c$,则欧姆接触不能有效地平衡边缘状态,其中$Ω_c$是接触的逆RC时间。浮置接触的该能量尺度可以变得与单电子充电能量$e^2/ C$一样大。

英文摘要:

Ohmic contacts are crucial elements of electron optics that have not received a clear theoretical description yet. We propose a model of an Ohmic contact as a piece of metal of the finite capacitance $C$ attached to a quantum Hall edge. It is shown that charged quantum Hall edge states may have weak coupling to neutral excitations in an Ohmic contact. Consequently, despite being a reservoir of neutral excitations, an Ohmic contact is not able to efficiently equilibrate edge states if its temperature is smaller than $\hbarΩ_c$, where $Ω_c$ is the inverse RC time of the contact. This energy scale for a floating contact may become as large as the single-electron charging energy $e^2/ C$.

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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