Terahertz-light quantum tuning of a metastable emergent phase hidden by superconductivity. Yang, X., Vaswani, C., Sundahl, C., Mootz, M., Gagel, P., Luo, L., Kang, J. H., Orth, P. P., Perakis, I. E., Eom, C. B., & Wang, J. NATURE MATERIALS, 17(7):586+, JUL, 2018. doi abstract bibtex `Sudden' quantum quench and prethermalization have become a cross-cutting theme for discovering emergent states of matter(1-4). Yet this remains challenging in electron matters(5-9), especially superconductors(10-14). The grand question of what is hidden underneath superconductivity (SC)(15) appears universal, but poorly understood. Here we reveal a long-lived gapless quantum phase of prethermalized quasiparticles (QPs) after a single-cycle terahertz (THz) quench of a Nb3Sn SC gap. Its conductivity spectra is characterized by a sharp coherent peak and a vanishing scattering rate that decreases almost linearly towards zero frequency, which is most pronounced around the full depletion of the condensate and absent for a high-frequency pump. Above a critical pump threshold, such a QP phase with coherent transport and memory persists as an unusual prethermalization plateau, without relaxation to normal and SC thermal states for an order of magnitude longer than the QP recombination and thermalization times. Switching to this metastable `quantum QP fluid' signals non-thermal quench of coupled SC and charge-density-wave (CDW)-like orders and hints quantum control beneath the SC.
@article{ ISI:000436341400011,
Author = {Yang, X. and Vaswani, C. and Sundahl, C. and Mootz, M. and Gagel, P. and
Luo, L. and Kang, J. H. and Orth, P. P. and Perakis, I. E. and Eom, C.
B. and Wang, J.},
Title = {{Terahertz-light quantum tuning of a metastable emergent phase hidden by
superconductivity}},
Journal = {{NATURE MATERIALS}},
Year = {{2018}},
Volume = {{17}},
Number = {{7}},
Pages = {{586+}},
Month = {{JUL}},
Abstract = {{`Sudden' quantum quench and prethermalization have become a
cross-cutting theme for discovering emergent states of matter(1-4). Yet
this remains challenging in electron matters(5-9), especially
superconductors(10-14). The grand question of what is hidden underneath
superconductivity (SC)(15) appears universal, but poorly understood.
Here we reveal a long-lived gapless quantum phase of prethermalized
quasiparticles (QPs) after a single-cycle terahertz (THz) quench of a
Nb3Sn SC gap. Its conductivity spectra is characterized by a sharp
coherent peak and a vanishing scattering rate that decreases almost
linearly towards zero frequency, which is most pronounced around the
full depletion of the condensate and absent for a high-frequency pump.
Above a critical pump threshold, such a QP phase with coherent transport
and memory persists as an unusual prethermalization plateau, without
relaxation to normal and SC thermal states for an order of magnitude
longer than the QP recombination and thermalization times. Switching to
this metastable `quantum QP fluid' signals non-thermal quench of coupled
SC and charge-density-wave (CDW)-like orders and hints quantum control
beneath the SC.}},
DOI = {{10.1038/s41563-018-0096-3}},
ISSN = {{1476-1122}},
EISSN = {{1476-4660}},
ResearcherID-Numbers = {{Orth, Peter/A-9408-2013
}},
ORCID-Numbers = {{Orth, Peter/0000-0003-2183-8120
Yang, Xu/0000-0002-3856-8182}},
Unique-ID = {{ISI:000436341400011}},
}
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Yet this remains challenging in electron matters(5-9), especially superconductors(10-14). The grand question of what is hidden underneath superconductivity (SC)(15) appears universal, but poorly understood. Here we reveal a long-lived gapless quantum phase of prethermalized quasiparticles (QPs) after a single-cycle terahertz (THz) quench of a Nb3Sn SC gap. Its conductivity spectra is characterized by a sharp coherent peak and a vanishing scattering rate that decreases almost linearly towards zero frequency, which is most pronounced around the full depletion of the condensate and absent for a high-frequency pump. Above a critical pump threshold, such a QP phase with coherent transport and memory persists as an unusual prethermalization plateau, without relaxation to normal and SC thermal states for an order of magnitude longer than the QP recombination and thermalization times. 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E. and Eom, C.\n B. and Wang, J.},\nTitle = {{Terahertz-light quantum tuning of a metastable emergent phase hidden by\n superconductivity}},\nJournal = {{NATURE MATERIALS}},\nYear = {{2018}},\nVolume = {{17}},\nNumber = {{7}},\nPages = {{586+}},\nMonth = {{JUL}},\nAbstract = {{`Sudden' quantum quench and prethermalization have become a\n cross-cutting theme for discovering emergent states of matter(1-4). Yet\n this remains challenging in electron matters(5-9), especially\n superconductors(10-14). The grand question of what is hidden underneath\n superconductivity (SC)(15) appears universal, but poorly understood.\n Here we reveal a long-lived gapless quantum phase of prethermalized\n quasiparticles (QPs) after a single-cycle terahertz (THz) quench of a\n Nb3Sn SC gap. 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