Possible Eliashberg-Type Superconductivity Enhancement Effects in a Two-Band Superconductor MgB2 Driven by Narrow-Band THz Pulses

被引：0

作者：

Sobolev S. ^{[1
]}

Lanz A.P. ^{[1
]}

Dong T. ^{[1
,2
]}

Pokharel A. ^{[1
]}

Kabanov V. ^{[3
]}

Xu T.-Q. ^{[4
]}

Wang Y. ^{[4
]}

Gan Z.-Z. ^{[4
]}

Shi L.-Y. ^{[2
]}

Wang N.-L. ^{[2
]}

Pashkin A. ^{[5
]}

Uykur E. ^{[5
]}

Winnerl S. ^{[5
]}

Helm M. ^{[5
]}

Demsar J. ^{[1
]}

机构：

[1] Institute of Physics, Johannes Gutenberg University, Mainz

[2] International Center for Quantum Materials (ICQM), Peking University, Beijing

[3] Josef Stefan Institute, Ljubljana

[4] Applied Superconductivity Center, State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing

[5] Helmholtz-Zentrum Dresden-Rossendorf, Dresden

来源：

Physical Review Letters | 2023年 / 131卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.131.186903

中图分类号：

学科分类号：

摘要：

We study THz-driven condensate dynamics in epitaxial thin films of MgB2, a prototype two-band superconductor (SC) with weak interband coupling. The temperature and excitation density dependent dynamics follow the behavior predicted by the phenomenological bottleneck model for the single-gap SC, implying adiabatic coupling between the two condensates on the ps timescale. The amplitude of the THz-driven suppression of condensate density reveals an unexpected decrease in pair-breaking efficiency with increasing temperature - unlike in the case of optical excitation. The reduced pair-breaking efficiency of narrow-band THz pulses, displaying minimum near ≈0.7 Tc, is attributed to THz-driven, long-lived, nonthermal quasiparticle distribution, resulting in Eliashberg-type enhancement of superconductivity, competing with pair breaking. © 2023 American Physical Society.

引用

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