Ultrafast dynamics of vibrational symmetry breaking in a charge-ordered nickelate
Abstract
The ability to probe symmetry-breaking transitions on their natural time scales is one of the key challenges in nonequilibrium physics. Stripe ordering represents an intriguing type of broken symmetry, where complex interactions result in atomic-scale lines of charge and spin density. Although phonon anomalies and periodic distortions attest the importance of electron-phonon coupling in the formation of stripe phases, a direct time-domain view of vibrational symmetry breaking is lacking. We report experiments that track the transient multi-terahertz response of the model stripe compound La1.75Sr0.25NiO4, yielding novel insight into its electronic and structural dynamics following an ultrafast optical quench. We find that although electronic carriers are immediately delocalized, the crystal symmetry remains initially frozen—as witnessed by time-delayed suppression of zone-folded Ni–O bending modes acting as a fingerprint of lattice symmetry. Longitudinal and transverse vibrations react with different speeds, indicating a strong directionality and an important role of polar interactions. As a result, the hidden complexity of electronic and structural coupling during stripe melting and formation, captured here within a single terahertz spectrum, opens new paths to understanding symmetry-breaking dynamics in solids.
- Authors:
-
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); North Carolina State Univ., Raleigh, NC (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Tokyo Institute of Technology, Kanagawa (Japan)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1432217
- Alternate Identifier(s):
- OSTI ID: 1419320
- Grant/Contract Number:
- AC02-05CH11231; AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Science Advances
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 11; Journal ID: ISSN 2375-2548
- Publisher:
- AAAS
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Coslovich, Giacomo, Kemper, Alexander F., Behl, Sascha, Huber, Bernhard, Bechtel, Hans A., Sasagawa, Takao, Martin, Michael C., Lanzara, Alessandra, and Kaindl, Robert A. Ultrafast dynamics of vibrational symmetry breaking in a charge-ordered nickelate. United States: N. p., 2017.
Web. doi:10.1126/sciadv.1600735.
Coslovich, Giacomo, Kemper, Alexander F., Behl, Sascha, Huber, Bernhard, Bechtel, Hans A., Sasagawa, Takao, Martin, Michael C., Lanzara, Alessandra, & Kaindl, Robert A. Ultrafast dynamics of vibrational symmetry breaking in a charge-ordered nickelate. United States. https://doi.org/10.1126/sciadv.1600735
Coslovich, Giacomo, Kemper, Alexander F., Behl, Sascha, Huber, Bernhard, Bechtel, Hans A., Sasagawa, Takao, Martin, Michael C., Lanzara, Alessandra, and Kaindl, Robert A. Fri .
"Ultrafast dynamics of vibrational symmetry breaking in a charge-ordered nickelate". United States. https://doi.org/10.1126/sciadv.1600735. https://www.osti.gov/servlets/purl/1432217.
@article{osti_1432217,
title = {Ultrafast dynamics of vibrational symmetry breaking in a charge-ordered nickelate},
author = {Coslovich, Giacomo and Kemper, Alexander F. and Behl, Sascha and Huber, Bernhard and Bechtel, Hans A. and Sasagawa, Takao and Martin, Michael C. and Lanzara, Alessandra and Kaindl, Robert A.},
abstractNote = {The ability to probe symmetry-breaking transitions on their natural time scales is one of the key challenges in nonequilibrium physics. Stripe ordering represents an intriguing type of broken symmetry, where complex interactions result in atomic-scale lines of charge and spin density. Although phonon anomalies and periodic distortions attest the importance of electron-phonon coupling in the formation of stripe phases, a direct time-domain view of vibrational symmetry breaking is lacking. We report experiments that track the transient multi-terahertz response of the model stripe compound La1.75Sr0.25NiO4, yielding novel insight into its electronic and structural dynamics following an ultrafast optical quench. We find that although electronic carriers are immediately delocalized, the crystal symmetry remains initially frozen—as witnessed by time-delayed suppression of zone-folded Ni–O bending modes acting as a fingerprint of lattice symmetry. Longitudinal and transverse vibrations react with different speeds, indicating a strong directionality and an important role of polar interactions. As a result, the hidden complexity of electronic and structural coupling during stripe melting and formation, captured here within a single terahertz spectrum, opens new paths to understanding symmetry-breaking dynamics in solids.},
doi = {10.1126/sciadv.1600735},
journal = {Science Advances},
number = 11,
volume = 3,
place = {United States},
year = {Fri Nov 24 00:00:00 EST 2017},
month = {Fri Nov 24 00:00:00 EST 2017}
}
Web of Science
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