Intrinsic Electric Dipole Moment of Tunneling Systems in Silica Glasses
Intrinsic Electric Dipole Moment of Tunneling Systems in Silica Glasses
复制标题
石英玻璃中隧道系统的本征电偶极矩
DOI：
10.1103/physrevlett.43.1817
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发表时间：
1979
影响因子：
8.6
通讯作者：
K. Dransfeld
中科院分区：
文献类型：
--
作者：
B. Golding;M. Schickfus;S. Hunklinger;K. Dransfeld
相干电回波的幅度和衰减率已系统地研究了在四个不同的OH浓度的石英玻璃在0.7 GHz的频率和温度低至19 mK。在OH含量可以忽略不计的玻璃中已经观察到回波，并且回波起源于具有约0.5 D的平均电偶极矩的固有隧穿系统。我们发现，在熔融石英中的OH与一个独特的非本征隧穿物种具有较大的偶极矩和较弱的声子耦合。
Coherent electric echo magnitudes and decay rates have been studied systematically in four silica glasses with differing OH concentrations at a frequency of 0.7 GHz and to temperatures as low as 19 mK. Echoes have been observed in glasses with negligible OH content and originate from intrinsic tunneling systems possessing a mean electric dipole moment of approximately 0.5 D. We show that the OH in fused silica is associated with a distinct extrinsic tunneling species with a larger dipole moment and weaker phonon coupling.