Photoinduced Enhancement of the Charge Density Wave Amplitude

článek v časopise ve Web of Science, Jimp

angličtina

Symmetry breaking and the emergence of order is one of the most fascinating phenomena in condensed matter physics. It leads to a plethora of intriguing ground states found in antiferromagnets, Mott insulators, superconductors, and density-wave systems. Exploiting states of matter far from equilibrium can provide even more striking routes to symmetry-lowered, ordered states. Here, we demonstrate for the case of elemental chromium that moderate ultrafast photoexcitation can transiently enhance the charge-density-wave (CDW) amplitude by up to 30% above its equilibrium value, while strong excitations lead to an oscillating, large-amplitude CDW state that persists above the equilibrium transition temperature. Both effects result from dynamic electron-phonon interactions, providing an efficient mechanism to selectively transform a broad excitation of the electronic order into a well-defined, long-lived coherent lattice vibration. This mechanism may be exploited to transiently enhance order parameters in other systems with coupled degrees of freedom.

Chromium; Superconductivity; Charge Density Waves; Manganites

SINGER, A.; PATEL, S.; KUKREJA, R.; UHLÍŘ, V.; WINGERT, J.; FESTERSEN, S.; ZHU, D.; GLOWNIA, J.; LEMKE, H.; NELSON, S.; KOZINA, M.; ROSSNAGEL, K.; BAUER, M.; MURPHY, B.; MAGNUSSEN, O.; FULLERTON, E.; SHPYRKO, O.

20. 3. 2016

1079-7114

Physical Review Letters

117

5

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056401-1

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