Laser-Induced Charge-Density-Wave Transient Depinning in Chromium

Abstract

We report here on time-resolved x-ray diffraction measurements following femtosecond laser excitation in pure bulk chromium. Comparing the evolution of incommensurate charge-density-wave (CDW) and atomic lattice reflections, we show that, few nanoseconds after laser excitation, the CDW undergoes different structural changes than the atomic lattice. We give evidence for a transient CDW shear strain that breaks the lattice point symmetry. This strain is characteristic of sliding CDWs, as observed in other incommensurate CDW systems, suggesting the laser-induced CDW sliding capability in 3D systems. This first evidence opens perspectives for unconventional laser-assisted transport of correlated charges.

4 pages with 4 figures + supplemental material with 4 figures, Published in Phys. Rev. Lett. 2016

References in corpus (4)

• Dynamics of photoinduced Charge Density Wave-metal phase transition in K0.3MoO3
• X-ray Microdiffraction Images of Antiferromagnetic Domain Evolution in Chromium
• Effect of dimensionality on sliding charge density waves. The case of the quasi-two dimensional TbTe${}_3$ system probed by coherent x-ray diffraction
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