论文标题
无定形固体中的异常低能特性以及隧道两级系统的电和弹性相互作用的相互作用
Anomalous low-energy properties in amorphous solids and the interplay of electric and elastic interactions of tunneling two-level systems
论文作者
论文摘要
隧道两级系统（TLSS），通用到无定形固体，决定了无定形固体的低温特性，并在量子纳米驱动器中占据了噪声和腐蚀性。 TLSS的特性通常由现象学标准隧道模型描述。然而，与该模型的预测的显着偏差在实验上发现，在描述TLSS时需要更精确的模型。在这里，我们表明，可以使用由于TLS-TLS相互作用引起的低能量下降低的能量依赖性TLS密度来解释声速，介电常数，比热和导热率的温度依赖性。这种还原取决于TLS-TLS相互作用的强度与随机电位之间的比率，这在具有显着的电二色相互作用的系统中得到了增强。
Tunneling two-level systems (TLSs), generic to amorphous solids, dictate the low-temperature 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 TLSs. 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 reduced at low energies due to TLS-TLS interactions. This reduction is determined by the ratio between the strengths of the TLS-TLS interactions and the random potential, which is enhanced in systems with dominant electric dipolar interactions.
