Ultrafast terahertz-field-driven ionic response in ferroelectric
- Stanford Univ., CA (United States). Dept. of Electrical Engineering; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Univ. of Pennsylvania, Philadelphia, PA (United States). Makineni Theoretical Lab., Dept. of Chemistry; Carnegie Inst. of Washington, Argonne, IL (United States). Geophysical Lab.
- Univ. of Pennsylvania, Philadelphia, PA (United States). Makineni Theoretical Lab., Dept. of Chemistry
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Chemistry
- Univ. of Duisburg-Essen, Duisburg (Germany). Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE)
- Lund Univ. (Sweden). MAX IV Lab.
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
- Stanford Univ., CA (United States). Dept. of Materials Science and Engineering
- Stanford Univ., CA (United States). Dept. of Materials Science and Engineering; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
- Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Materials Science and Engineering
- Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
- Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
- Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
- Lund Univ. (Sweden). Dept. of Physics
- Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Dept. of Materials Science and Engineering,; SLAC National Accelerator Lab., Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Inst. (PULSE)
The dynamical processes associated with electric field manipulation of the polarization in a ferroelectric remain largely unknown but fundamentally determine the speed and functionality of ferroelectric materials and devices. Here we apply subpicosecond duration, single-cycle terahertz pulses as an ultrafast electric field bias to prototypical BaTiO3 ferroelectric thin films with the atomic-scale response probed by femtosecond x-ray-scattering techniques. We show that electric fields applied perpendicular to the ferroelectric polarization drive large-amplitude displacements of the titanium atoms along the ferroelectric polarization axis, comparable to that of the built-in displacements associated with the intrinsic polarization and incoherent across unit cells. This effect is associated with a dynamic rotation of the ferroelectric polarization switching on and then off on picosecond time scales. These transient polarization modulations are followed by long-lived vibrational heating effects driven by resonant excitation of the ferroelectric soft mode, as reflected in changes in the c-axis tetragonality. The ultrafast structural characterization described here enables a direct comparison with first-principles-based molecular-dynamics simulations, with good agreement obtained.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); US Army Research Office (ARO); National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR)
- Grant/Contract Number:
- SC0012375; AC02-06CH11357; FG02-07ER15920; AC02-76SF00515; W911NF-14-1-0104; CMMI-1334241; CHE-1111557; N00014-12-1-1033; N00014-13-1-0509; AC02-05CH11231
- OSTI ID:
- 1360175
- Alternate ID(s):
- OSTI ID: 1333328; OSTI ID: 1468336
- Journal Information:
- Physical Review B, Vol. 94, Issue 18; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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