Mechanisms of nonthermal destruction of the superconducting state and melting of the charge-density-wave state by femtosecond laser pulses

作者：Stojchevska, L.^*; Kusar, P.; Mertelj, T.; Kabanov, V. V.; Toda, Y.; Yao, X.; Mihailovic, D.

来源：Physical Review B, 2011, 84(18): 180507.

DOI：10.1103/PhysRevB.84.180507

• DYNAMICS

The processes leading to nonthermal condensate vaporization and charge-density-wave (CDW) melting with femtosecond laser pulses is systematically investigated in different materials. We find that vaporization is relatively slow (tau(v)1 ps) and inefficient in superconductors, exhibiting a strong systematic dependence of the vaporization energy U-v on T-c. In contrast, melting of CDW order proceeds rapidly (tau(m) = 50-200 fs) and more efficiently. A quantitative model describing the observed systematic behavior in superconductors is proposed based on a phonon-mediated quasiparticle (QP) bottleneck mechanism. In contrast, Fermi-surface disruption by hot QPs is proposed to be responsible for CDW state melting.

• 出版日期2011-11-14
• 单位上海交通大学