Dynamics of semifluxons in Nb long Josephson 0-pi junctions.
Dynamics of semifluxons in Nb long Josephson 0-pi junctions.
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DOI：
10.1103/physrevlett.92.057005
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发表时间：
2003-11
影响因子：
8.6
通讯作者：
E. Goldobin;A. Sterck;T. Gaber;D. Koelle;R. Kleiner
中科院分区：
文献类型：
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作者：
E. Goldobin;A. Sterck;T. Gaber;D. Koelle;R. Kleiner
我们提出，实施，并测试实验长约瑟夫森0-π结使用传统的Nb-AlOx-Nb技术制造。我们表明，通过使用一对电流注入器可以创建一个任意的约瑟夫森相位的不连续性，特别是一个π不连续性，就像在d-波/s-波或d-波/d-波结，并研究分数约瑟夫森涡自发出现。此外，使用这样的交界处，我们可以调查的分数涡的动力学-一个域，这是尚未提供自然0 π路口，由于其固有的高阻尼。我们观察到半整数零场台阶，出现在电流-电压特性，由于半流激子的跳跃。
We propose, implement, and test experimentally long Josephson 0-pi junctions fabricated using conventional Nb-AlOx-Nb technology. We show that by using a pair of current injectors one can create an arbitrary discontinuity of the Josephson phase and, in particular, a pi discontinuity, just as in d-wave/s-wave or in d-wave/d-wave junctions, and study fractional Josephson vortices which spontaneously appear. Moreover, using such junctions, we can investigate the dynamics of the fractional vortices-a domain which is not yet available for natural 0-pi junctions due to their inherently high damping. We observe half-integer zero-field steps which appear on the current-voltage characteristics due to the hopping of semifluxons.