Soft-mode driven polarity reversal in ferroelectrics mapped by ultrafast x-ray diffraction | Zendy

Chrıstoph Hauf | Zendy; Antonio-Andres Hernández Salvador | Zendy; Marcel Holtz | Zendy; M. Woerner | Zendy; Thomas Elsaesser | Zendy

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Soft-mode driven polarity reversal in ferroelectrics mapped by ultrafast x-ray diffraction

Author(s) -

Chrıstoph Hauf,

Antonio-Andres Hernández Salvador,

Marcel Holtz,

M. Woerner,

Thomas Elsaesser

Publication year - 2018

Publication title -

structural dynamics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.415

H-Index - 29

ISSN - 2329-7778

DOI - 10.1063/1.5026494

Subject(s) - femtosecond , diffraction , polarity (international relations) , polarization (electrochemistry) , condensed matter physics , phonon , excitation , ferroelectricity , ultrashort pulse , amplitude , polarity reversal , lattice (music) , charge (physics) , charge density , materials science , physics , optics , molecular physics , chemistry , laser , optoelectronics , dielectric , quantum mechanics , biochemistry , voltage , acoustics , cell

Quantum theory has linked microscopic currents and macroscopic polarizations of ferroelectrics, but the interplay of lattice excitations and charge dynamics on atomic length and time scales is an open problem. Upon phonon excitation in the prototypical ferroelectric ammonium sulfate [(NH 4 ) 2 SO 4 ], we determine transient charge density maps by femtosecond x-ray diffraction. A newly discovered low frequency-mode with a 3 ps period and sub-picometer amplitudes induces periodic charge relocations over some 100 pm, a hallmark of soft-mode behavior. The transient charge density allows for deriving the macroscopic polarization, showing a periodic reversal of polarity.

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