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Ultrafast above-transition-temperature resurrection of spin density wave driven by coherent phonon generation in BaFe2As2

Title
Ultrafast above-transition-temperature resurrection of spin density wave driven by coherent phonon generation in BaFe2As2
Authors
Lee, J. D.Yun, Won SeokHong, S. C.
DGIST Authors
Lee, J. D.
Issue Date
2014-04-11
Citation
New Journal of Physics, 16
Type
Article
Article Type
Article
Keywords
Antiferromagnetic SDWBaFe2As2CalculationsCoherent PhononCoherent PhononsElectronic StructureElectronic Structure CalculationsFirst-Principles CalculationOptical PumpingPhononsSpin-Phonon CouplingSpin Density WaveSpin Density WavesSuperconducting DevicesTime-Dependent Ginzburg-Landau TheoriesTime-Dependent Ginzburg-Landau TheoryUltra-Fast
ISSN
1367-2630
Abstract
A model incorporating the time-dependent Ginzburg-Landau theory of ultrafast cooperative interplay among charge, spin, and lattice is presented for the pnictide superconductor BaFe2As2. Under the ultrafast optical pumping, a pronounced spin-phonon coupling is found to drive the reconstruction of spin density wave (SDW) at T > Ts (Ts: SDW transition temperature) through the coherent phonon generation. First-principles electronic structure calculation confirms that the macroscopically coherent A 1g oscillation of As over a new equilibrium displacement offers a route to the antiferromagnetic SDW state. Our finding explains the recent experimental observation. © 2014 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
URI
http://hdl.handle.net/20.500.11750/5259
DOI
10.1088/1367-2630/16/4/043010
Publisher
Institute of Physics Publishing
Related Researcher
  • Author Lee, Jae Dong Light and Matter Theory Laboratory
  • Research Interests Theoretical Condensed Matter Physics; Ultrafast Dynamics and Optics; Nonequilibrium Phenomena
Files:
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Collection:
Emerging Materials ScienceLight and Matter Theory Laboratory1. Journal Articles


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