| Autor: |
Singer, A., Patel, S. K. K., Kukreja, R., Uhlíř, V., Wingert, J., Festersen, S., Zhu, D., Glownia, J. M., Lemke, H., Nelson, S., Kozina, M., Rossnagel, K., Bauer, M., Murphy, B. M., Magnussen, O. M., Fullerton, E. E., Shpyrko, O. G. |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Phys. Rev. Lett. 117, 056401 (2016) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.117.056401 |
| Popis: |
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 photo-excitation 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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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