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

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arxiv 1109.5546 v1 pith:AN2GBE55 submitted 2011-09-26 cond-mat.supr-con

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

L. Stojchevska , P. Kusar , T. Mertelj , V. V. Kabanov , Y. Toda , X. Yao , D. Mihailovic This is my paper
classification cond-mat.supr-con
keywords meltingstatevaporizationcontrastfemtosecondlasernonthermalproposed
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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 Uv on Tc. 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 quasi-particle (QP) bottleneck mechanism. In contrast, Fermi surface disruption by hot QPs is proposed to be responsible for CDW state melting.

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