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Title: Enhanced coherent oscillations in the superconducting state of underdoped YB a 2 C u 3 O 6 + x induced via ultrafast terahertz excitation

Abstract

We utilize intense, single-cycle terahertz pulses to induce collective excitations in the charge-density-wave-ordered underdoped cuprate YBa2Cu3O6+x. These excitations manifest themselves as pronounced coherent oscillations of the optical reflectivity in the transient state, accompanied by minimal incoherent quasiparticle relaxation dynamics. The oscillations occur at frequencies consistent with soft phonon energies associated with the charge-density-wave, but vanish above the superconducting transition temperature rather than that at the charge-density-wave transition. These results indicate an intimate relationship of the terahertz excitation with the underlying charge-density-wave and the superconducting condensate itself.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1198519
Alternate Identifier(s):
OSTI ID: 1221596
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Published Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Volume: 91 Journal Issue: 22; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Dakovski, Georgi L., Lee, Wei-Sheng, Hawthorn, David G., Garner, Niklas, Bonn, Doug, Hardy, Walter, Liang, Ruixing, Hoffmann, Matthias C., and Turner, Joshua J. Enhanced coherent oscillations in the superconducting state of underdoped YB a 2 C u 3 O 6 + x induced via ultrafast terahertz excitation. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.91.220506.
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Dakovski, Georgi L., Lee, Wei-Sheng, Hawthorn, David G., Garner, Niklas, Bonn, Doug, Hardy, Walter, Liang, Ruixing, Hoffmann, Matthias C., & Turner, Joshua J. Enhanced coherent oscillations in the superconducting state of underdoped YB a 2 C u 3 O 6 + x induced via ultrafast terahertz excitation. United States. https://doi.org/10.1103/PhysRevB.91.220506
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Dakovski, Georgi L., Lee, Wei-Sheng, Hawthorn, David G., Garner, Niklas, Bonn, Doug, Hardy, Walter, Liang, Ruixing, Hoffmann, Matthias C., and Turner, Joshua J. Wed . "Enhanced coherent oscillations in the superconducting state of underdoped YB a 2 C u 3 O 6 + x induced via ultrafast terahertz excitation". United States. https://doi.org/10.1103/PhysRevB.91.220506.
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@article{osti_1198519,
title = {Enhanced coherent oscillations in the superconducting state of underdoped YB a 2 C u 3 O 6 + x induced via ultrafast terahertz excitation},
author = {Dakovski, Georgi L. and Lee, Wei-Sheng and Hawthorn, David G. and Garner, Niklas and Bonn, Doug and Hardy, Walter and Liang, Ruixing and Hoffmann, Matthias C. and Turner, Joshua J.},
abstractNote = {We utilize intense, single-cycle terahertz pulses to induce collective excitations in the charge-density-wave-ordered underdoped cuprate YBa2Cu3O6+x. These excitations manifest themselves as pronounced coherent oscillations of the optical reflectivity in the transient state, accompanied by minimal incoherent quasiparticle relaxation dynamics. The oscillations occur at frequencies consistent with soft phonon energies associated with the charge-density-wave, but vanish above the superconducting transition temperature rather than that at the charge-density-wave transition. These results indicate an intimate relationship of the terahertz excitation with the underlying charge-density-wave and the superconducting condensate itself.},
doi = {10.1103/PhysRevB.91.220506},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 22,
volume = 91,
place = {United States},
year = {Wed Jun 24 00:00:00 EDT 2015},
month = {Wed Jun 24 00:00:00 EDT 2015}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevB.91.220506
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Cited by: 22 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) An illustration of the experimental setup (not drawn to scale). (b) A cartoon of the band structure of a d-wave superconductor exhibited in YBCO. An 800 nm pump pulse, with a photon energy of ∼1.5 eV, excites a large number of “hot” electrons well above the Fermimore » energy and can in principle excite quasiparticles over the entire Brillouin zone. A THz frequency pump pulse, which has a much lower energy (∼4 meV) and which is on the same scale as the electron states near the nodal point ($\phi$ = $\pi$/4), can couple to these near-node states directly. (c) The time evolution of the 800 nm reflectivity change after an optical excitation of 800 nm at 15 K (adapted from Hinton et al. with permission). (d) The time trace of the 800 nm reflectivity change due to a THz excitation at 10 K. The optical excitation [(c), red curve] used a fluence of ∼1.5 $\mu$J/cm2 and results in a large number of photoinduced quasiparticles as seen as a large background in the figure. The THz data [(d), blue curve] uses a fluence of ∼44 $\mu$J/cm2 and shows the large oscillation with minimal quasiparticle generation.« less
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