非晶固体的反常低能性质及隧穿两能级系统的电弹性相互作用

A. Churkin, S. Matityahu, A. Maksymov, A. Burin, M. Schechter
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引用次数: 3

摘要

隧道双能级系统(TLSs)是非晶固体的通用系统,它决定了非晶固体的低能量特性,并在量子纳米器件中控制噪声和退相干。TLSs的性质一般用现象学标准隧穿模型来描述。然而,从实验中发现的与该模型预测的显著偏差表明,需要一个更精确的模型来描述非晶固体的低能特性。在这里,我们表明声速、介电常数、比热和导热系数的温度依赖关系可以用能量依赖的TLS态密度来解释。低能态TLS密度的减小与TLS-TLS相互作用强度与随机电位之比有关,在电偶极相互作用占主导地位的系统中,TLS密度的减小得到增强。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Anomalous low-energy properties in amorphous solids and the interplay of electric and elastic interactions of tunneling two-level systems
Tunneling two-level systems (TLSs), generic to amorphous solids, dictate the low-energy properties of amorphous solids and dominate noise and decoherence in quantum nano-devices. The properties of the TLSs are generally described by the phenomenological standard tunneling model. Yet, significant deviations from the predictions of this model found experimentally suggest the need for a more precise model in describing the low-energy properties of amorphous solids. Here we show that the temperature dependence of the sound velocity, dielectric constant, specific heat, and thermal conductivity, can be explained using an energy-dependent TLS density of states. The reduction of the TLS density of states at low energies relates to the ratio between the strengths of the TLS-TLS interactions and the random potential, which is enhanced in systems with dominant electric dipolar interactions.
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