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Disorder driven superconductor-insulator transition in inhomogenous d-wave superconductor

Science China(Physics,Mechanics & Astronomy) 2016年第1期59卷 86-91页

作者： Jian Sun Long He Yang Yang Zhao Yun Song Department of Physics Beijing Normal University

We study the effect of disorder on the superconductor-insulator transition in an inhomogeneous d-wave superconductor using the kernel polynomial method. As the Bogoliubov-de Gennes equations of the two-dimensional square lattice are solved self-consistently for the cases with more than 100000 unit cells, it is possible to observe the spatial fluctuations of the superconducting order parameters at the nanoscale. We find that strong spatial fluctuation of the superconducting order parameters can be introduced by disorder, and some superconducting specific order parameters are even enhanced. Moreover, we find that some isolated superconducting "islands" can survive the strong disorder, giving a boson insulator with some localized Cooper pairs. Our numerical calculations predict the existence of two sequential transitions with the increasing disorder strength: a d-wave to s-wave superconductor transition, and then an s-wave superconductor to insulator transition. The possibility of the appearance of a metallic phase between the superconducting and insulating phases is excluded by performing the lattice-size scaling of the generalized inverse participation ratio. In addition, we also discuss the effect of disorder on the optical conductivity of the d-wave superconductors.

关键词： superconductor-insulator transition effect of disorder d-wave superconductor

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Electrical and thermoelectric study of two-dimensional crystal of NbSe2

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Chinese Physics B 2020年第8期29卷 137-142页

作者： Xin-Qi Li Zhi-Lin Li Jia-Ji Zhao Xiao-Song Wu State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Beijing Key Laboratory of Quantum DevicesPeking UniversityBeijing 100871China Frontiers Science Center for Nano-optoelectronics and Collaborative Innovation Center of Quantum Matter Beijing 100871China

We report experimental investigation of the resistivity and Nernst effect in two-dimensional(2D)NbSe2 crystals.A strongly enhanced Nernst effect,100 times larger than that in bulk NbSe2,caused by moving vortices is observed in thin *** is found that in the low temperature,high magnetic field regime,pinning effects show little dependence on the thickness and resistivity of the superconductor *** Nernst signals persist above the superconducting transition,suggesting that the Nernst effect is a sensitive probe to superconducting fluctuations.A magnetic field induced superconductor-insulator transition(SIT)is evident,which is surprising in that such a SIT usually takes place in disordered dirty superconductors,while our samples are highly crystalline and close to the clean ***,our results expand the scope of SIT into 2D crystal clean superconductors.

关键词： two-dimensional superconductivity Nernst effect superconducting fluctuations superconductor-insulator transition

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