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arXiv 2103.06977cond-mat.dis-nn
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低温下金属玻璃的声学性质--隧穿系统及其退相

Acoustic properties of metallic glasses at low temperatures -- tunneling systems and their dephasing

Arnold Meißner, Tim Voigtländer, Saskia M. Meißner, Uta Kühn, Susanne Schneider, Alexander Shnirman, Georg Weiss

摘要:

在宽频率范围内测量的大块金属玻璃的低温声学性质严格地测试了标准隧穿模型的预测。这些实验和分析的强度主要是基于隧道态与超导态中的传导电子或准粒子的相互作用。在kHz和GHz频率下对相同样品材料进行的一系列新实验基本上证实了先前的测量结果及其与理论预测的差异。这些差异可以通过更正确地考虑占主导地位的二能级原子隧穿系统的线宽来消除。事实上,由与传导电子的相互作用引起或介导的失相可能导致特别大的线宽,并破坏隧道系统在正常导电状态下的二能级特性。

英文摘要:

The low temperature acoustic properties of bulk metallic glasses measured over a broad range of frequencies rigorously test the predictions of the standard tunneling model. The strength of these experiments and their analyses is mainly based on the interaction of the tunneling states with conduction electrons or quasiparticles in the superconducting state. A new series of experiments at kHz and GHz frequencies on the same sample material essentially confirms previous measurements and their discrepancies with theoretical predictions. These discrepancies can be lifted by considering more correctly the line widths of the dominating two-level atomic-tunneling systems. In fact, dephasing caused or mediated by interaction with conduction electrons may lead to particularly large line widths and destroy the tunneling sytems' two-level character in the normal conducting state.

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