Bosonic topological insulator intermediate state in the superconductor-insulator transition
Bosonic topological insulator intermediate state in the superconductor-insulator transition
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DOI：
10.1016/j.physleta.2020.126570
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发表时间：
2020-08-17
影响因子：
2.6
通讯作者：
Vinokur, V. M.
中科院分区：
文献类型：
--
作者：
Diamantini, M. C.;Mironov, A. Yu;Vinokur, V. M.
二维超导体-绝缘体转变中出现的低温介入金属状态挑战了我们对电子流体的理解。在这里，我们发展了一种规范理论，揭示了这种新兴的异常金属是一种玻色子拓扑绝缘体，其中块体输运受到非冷凝库珀对和涡旋之间的相互统计相互作用的抑制，而纵向电导率则由对称保护的无间隙边缘模式介导。我们探索了铌钛氮化物器件中磁场驱动的超导体-绝缘体转变，并发现了具有饱和电阻的介入状态的玻色子拓扑绝缘体行为的显着特征。观察到的超导体-异常金属和绝缘体-异常金属双相变表现出符合规范理论的量子Berezinskii-Kosterlitz-Thouless临界性。 (C) 2020 作者。由 Elsevier B.V. 出版
A low-temperature intervening metallic regime arising in the two-dimensional superconductor-insulator transition challenges our understanding of electronic fluids. Here we develop a gauge theory revealing that this emergent anomalous metal is a bosonic topological insulator where bulk transport is suppressed by mutual statistics interactions between out-of-condensate Cooper pairs and vortices and the longitudinal conductivity is mediated by symmetry-protected gapless edge modes. We explore the magnetic-field-driven superconductor-insulator transition in a niobium titanium nitride device and find marked signatures of a bosonic topological insulator behavior of the intervening regime with the saturating resistance. The observed superconductor-anomalous metal and insulator-anomalous metal dual phase transitions exhibit quantum Berezinskii-Kosterlitz-Thouless criticality in accord with the gauge theory. (C) 2020 The Author(s). Published by Elsevier B.V.