Turning a band insulator into an exotic superconductor.

Turning a band insulator into an exotic superconductor.
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DOI:
10.1038/ncomms5144
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发表时间:
2014-07-11
影响因子:
16.6
通讯作者:
Savrasov, Sergey Y.
Savrasov, Sergey Y.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wan, Xiangang;Savrasov, Sergey Y.

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了解库珀对的奇异非类 s 波态非常重要,并且可能会产生具有更高临界温度和新颖特性的新型超导体。已知它们的存在是可能的,但一直被认为与非传统超导机制有关,其中电子相关性发挥着重要作用。在这里,我们使用第一原理线性响应计算来表明,在掺杂的 Bi2Se3 中,通过传统的声子介导机制,可以有利于非常规的 p 波状状态,这是由长波长下电子-声子相互作用的不寻常的、几乎奇异的行为驱动的。这可能为我们理解掺杂带绝缘体中的超导现象提供一个新的平台。 大多数表现出奇异配对对称性的超导体都源自莫特绝缘体的主体材料。 Xianang Wan 和 Sergey Savrasov 表明,在掺杂 Bi2Se3 中实现奇异的 p 波超导体是可能的,Bi2Se3 是一种拓扑带绝缘体。
Understanding exotic, non-s-wave-like states of Cooper pairs is important and may lead to new superconductors with higher critical temperatures and novel properties. Their existence is known to be possible but has always been thought to be associated with non-traditional mechanisms of superconductivity where electronic correlations play an important role. Here we use a first principles linear response calculation to show that in doped Bi2Se3 an unconventional p-wave-like state can be favoured via a conventional phonon-mediated mechanism, as driven by an unusual, almost singular behaviour of the electron–phonon interaction at long wavelengths. This may provide a new platform for our understanding of superconductivity phenomena in doped band insulators. Most superconductors that exhibit exotic pairing symmetries are derived from host materials that are Mott insulators. Xiangang Wan and Sergey Savrasov show that it may be possible to realize an exotic p-wave superconductor in doped Bi2Se3, which is a topological band insulator.
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