Shapiro steps observed in annular intrinsic Josephson junctions at low microwave frequencies
Shapiro steps observed in annular intrinsic Josephson junctions at low microwave frequencies
复制标题
DOI：
10.1063/1.2172010
复制
发表时间：
2006-02
影响因子：
4
通讯作者：
Hua-bing Wang;Sangtae Kim;S. Urayama;M. Nagao;T. Hatano;S. Arisawa;T. Yamashita;Peiheng Wu
中科院分区：
文献类型：
--
作者：
Hua-bing Wang;Sangtae Kim;S. Urayama;M. Nagao;T. Hatano;S. Arisawa;T. Yamashita;Peiheng Wu
利用厚度为200nm的Bi2Sr2CaCu2O8+δ单晶片结构的环形本征约瑟夫森结，我们设计了一种仅通过扫偏置电流注入通量子的方法。这些堆表现出典型的约瑟夫森通量守恒特性。这些环形结对微波辐射很敏感，并且在~ 20GHz处观察到相当尖锐的夏皮罗台阶，这比结的等离子体频率低得多，表明许多应用可以用实际可获得的微波源。
With annular intrinsic Josephson junctions structured from a slice of Bi2Sr2CaCu2O8+δ single crystal 200nm thick, we have devised a way to inject fluxons into the junctions only by sweeping the bias current. The stacks have shown typical properties concerning Josephson fluxon conservation. These annular junctions are sensitive to microwave irradiation, and quite sharp Shapiro steps have been observed at ∼20GHz which is much lower than the plasma frequency of the junctions, indicating many applications can be possible with practically accessible microwave sources.