Andreev states near short-ranged pairing potential impurities.
Andreev states near short-ranged pairing potential impurities.
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安德烈耶夫指出，近程配对的潜在杂质。
DOI：
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发表时间：
2005
影响因子：
8.6
通讯作者：
P. Hirschfeld
中科院分区：
文献类型：
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作者：
B. M. Andersen;A. Melikyan;T. Nunner;P. Hirschfeld
我们研究了短相干长度的S波和d波超导体的配对势中近原子尺度的Andreev态调制。为了适度减小局域能隙，能级只存在于能隙边缘附近。然而，如果允许序参数的局部符号变化，则共振可以发生在接近费米能级的能量处。这种配对势能缺陷周围的局域态密度(LDOS)与在Bi2Sr2CaCu2O8+x(BSCCO)中锌杂质周围的隧道测量结果非常相似。我们从实验上讨论了锌LDOS图案的这一位相杂质模型如何与其他方案区分开来。
We study Andreev states near atomic scale modulations in the pairing potential in both s- and d-wave superconductors with short coherence lengths. For a moderate reduction of the local gap, the states exist only close to the gap edge. If one allows for local sign changes of the order parameter, however, resonances can occur at energies close to the Fermi level. The local density of states (LDOS) around such pairing potential defects strongly resembles the patterns observed by tunneling measurements around Zn impurities in Bi2Sr2CaCu2O8+x (BSCCO). We discuss how this phase impurity model of the Zn LDOS pattern can be distinguished from other proposals experimentally.