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arXiv 0802.4457cond-mat.supr-con
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超导光刻微波谐振器中二能级系统表面分布的实验证据

Experimental evidence for a surface distribution of two-level systems in superconducting lithographed microwave resonators

Jiansong Gao, Miguel Daal, Peter Day, Benjamin Mazin, Henry LeDuc, Anastasios Vayonakis, Shwetank Kumar, Bernard Sadoulet, Jonas Zmuidzinas

摘要:

我们提出了测量的温度依赖性的频率偏移的五个铌超导共面波导微谐振器的中心带宽度范围从3 $μ$ m到50 $μ$ m,在温度范围在100-800 mK,远低于9.2 K的铌的转变温度。这些数据与二能级系统(TLS)理论吻合得很好。与该理论的拟合提供了关于与每个谐振器几何形状相互作用的TLS的数量的信息。的几何比例表示TLS的表面分布,和数据是一致的TLS表面层厚度的顺序为几纳米,可以预期的原生氧化层。

英文摘要:

We present measurements of the temperature-dependent frequency shift of five niobium superconducting coplanar waveguide microresonators with center strip widths ranging from 3 $μ$m to 50 $μ$m, taken at temperatures in the range 100-800 mK, far below the 9.2 K transition temperature of niobium. These data agree well with the two-level system (TLS) theory. Fits to this theory provide information on the number of TLS that interact with each resonator geometry. The geometrical scaling indicates a surface distribution of TLS, and the data are consistent with a TLS surface layer thickness of order a few nm, as might be expected for a native oxide layer.

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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