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arXiv 2411.13232cond-mat.mes-hallcond-mat.mtrl-sciquant-ph
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量子隧道结中的耗散

Dissipation in quantum tunnel junctions

Edgar J. Patiño, L. Rios E., N. G. Kelkar, Daniel Lopez

AI总结:

本文基于实验数据提出含非线性摩擦力 f(x)=γ v(x)^α 的量子隧穿耗散模型,研究电压与温度对固态结耗散的影响,并发现 137 K 是耗散特性转变的临界温度。

摘要:

基于实验数据,我们提出了一个模型来评估固态结中量子隧穿过程中耗散的能量。该模型引入了一个非线性摩擦力,其一般形式为 f(x)=γ v(x)^α,其中 γ 是摩擦系数,通过数据拟合得到。我们通过在略低于势垒高度直至接近击穿电压的范围内施加电压来研究这一问题。此外,通过降低温度并调节施加到结上的电压,研究了势垒高度变化对耗散的影响。我们强调,耗散对粒子能量损失比例的关键依赖受到两个主要机制的调制:施加电压和温度变化。在给定温度下,对于能量逐渐增加的隧穿粒子,耗散的能量比例总体呈下降趋势。然而,对于给定能量的隧穿粒子,本工作表明在 137 K 温度处存在一个转折点,超过该温度后,耗散能量开始随温度升高而增加。后一现象可能归因于电子-声子相互作用的增强,在较高温度下这种相互作用变得比势垒高度降低更为显著,因此我们将 T = 137 K 确定为所研究固态结耗散特性发生变化的临界温度。值得注意的是,该研究还发现耗散参数 γ 和 α 在 137 K 以上发生显著变化,表现出线性下降,凸显了在更高温度下开展进一步研究的重要性。

英文摘要:

Based on experimental data, we propose a model to evaluate the energy dissipated during quantum tunneling processes in solid-state junctions. This model incorporates a nonlinear friction force expressed in the general form f(x)=γ v(x)^α, where γ is the frictional coefficient, which is fitted to data. We study this by applying voltages just below the barrier height up to near break down voltages. Furthermore, by lowering the temperature and adjusting the applied voltage to the junction, the effect on dissipation caused by the variation in barrier height is examined. We underline that the crucial dependency of dissipation on the fraction of particle energy lost is modulated by two primary mechanisms: the application of voltage and the variation of temperature. The fraction of energy dissipated decreases in general for increasing energies of the tunneling particles at a given temperature. However, for a given energy of the tunneling particle, the present work demonstrates a turning point at a temperature of 137 K, after which the dissipated energy starts increasing for higher temperatures. The latter can possibly be due to the increase of electron-phonon interactions which become predominant over barrier height reduction at higher temperatures and hence we identify T = 137 K as a critical temperature for change in dissipative characteristics of the solid-state junction under consideration. Notably, also the study identifies significant changes in dissipation parameters, γ and α, above 137 K, exhibiting a linear decline and underscoring the importance of further research at higher temperatures.

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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