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Light-induced Asymmetric Pseudogap below T$_\text{c}$ in cuprates
Authors:
D. Armanno,
O. Gingras,
F. Goto,
J. -M. Parent,
A. Longa,
A. Jabed,
B. Frimpong,
R. D. Zhong,
J. Schneeloch,
G. D. Gu,
G. Jargot,
H. Ibrahim,
F. Legare,
B. J. Siwick,
N. Gauthier,
A. Georges,
A. J. Millis,
F. Boschini
Abstract:
To this day, high-temperature cuprate superconductors remain an unparalleled platform for studying the competition and coexistence of emergent, static and dynamic, quantum phases of matter exhibiting high transition temperature non-s-wave superconductivity, non-Fermi liquid transport and a still enigmatic pseudogap regime. However, how superconductivity emerges alongside and competes with the pseu…
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To this day, high-temperature cuprate superconductors remain an unparalleled platform for studying the competition and coexistence of emergent, static and dynamic, quantum phases of matter exhibiting high transition temperature non-s-wave superconductivity, non-Fermi liquid transport and a still enigmatic pseudogap regime. However, how superconductivity emerges alongside and competes with the pseudogap regime remains an open question. Here, we present a high-resolution, time- and angle-resolved photoemission study of the near-antinodal region of optimally-doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$. For a sufficiently high excitation fluence, we disrupt superconductivity and drive a transient change from a symmetric superconducting-like to an asymmetric pseudogap-like density of states, for electronic temperatures well below the equilibrium superconducting critical temperature. Conversely, when the superconductivity is fully restored, the pseudogap is suppressed, as signaled by a fully particle-hole symmetric density of states. A unique aspect of our experiments is that the pseudogap coexists with superconducting features at intermediate times or at intermediate fluence. Our findings challenge the paradigm that superconductivity emerges by establishing phase coherence in the pseudogap. Instead, our experimental results, supported by phenomenological theory, demonstrate that the two states compete, and that the low-temperature ground state of the cuprates originates from a competition between superconducting and pseudogap states.
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Submitted 25 November, 2025;
originally announced November 2025.
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Control of intervalley scattering in Bi$_2$Te$_3$ via temperature-dependent band renormalization
Authors:
A. Jabed,
F. Goto,
B. Frimpong,
D. Armanno,
A. Longa,
M. Michiardi,
A. Damascelli,
P. Hofmann,
G. Jargot,
H. Ibrahim,
F. Légaré,
N. Gauthier,
S. Beaulieu,
F. Boschini
Abstract:
The control of out-of-equilibrium electron dynamics in topological insulators is essential to unlock their potential in next-generation quantum technologies. However, the role of temperature on the renormalization of the electronic band structure and, consequently, on electron scattering processes is still elusive. Here, using high-resolution time- and angle-resolved photoemission spectroscopy (TR…
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The control of out-of-equilibrium electron dynamics in topological insulators is essential to unlock their potential in next-generation quantum technologies. However, the role of temperature on the renormalization of the electronic band structure and, consequently, on electron scattering processes is still elusive. Here, using high-resolution time- and angle-resolved photoemission spectroscopy (TR-ARPES), we show that even a modest ($\sim$15 meV) renormalization of the conduction band of Bi$_2$Te$_3$ can critically affect bulk and surface electron scattering processes. Supported by a kinetic Monte Carlo toy-model, we show that temperature-induced changes in the bulk band structure modulate the intervalley electron-phonon scattering rate, reshaping the out-of-equilibrium response. This work establishes temperature as an effective control knob for engineering scattering pathways in topological insulators.
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Submitted 3 June, 2025;
originally announced June 2025.
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Direct evidence of light-induced phase-fluctuations in cuprates via time-resolved ARPES
Authors:
D. Armanno,
F. Goto,
J. -M. Parent,
S. Lapointe,
A. Longa,
R. D. Zhong,
J. Schneeloch,
G. D. Gu,
G. Jargot,
H. Ibrahim,
F. Legare,
B. J. Siwick,
N. Gauthier,
F. Boschini
Abstract:
Phase fluctuations are widely accepted to play a primary role in the quench of the long-range superconducting order in cuprates. However, an experimental probe capable of unambiguously assessing their impact on the superconducting order parameter with momentum and time resolutions is still lacking. Here, we performed a high-resolution time- and angle-resolved photoemission study of optimally-doped…
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Phase fluctuations are widely accepted to play a primary role in the quench of the long-range superconducting order in cuprates. However, an experimental probe capable of unambiguously assessing their impact on the superconducting order parameter with momentum and time resolutions is still lacking. Here, we performed a high-resolution time- and angle-resolved photoemission study of optimally-doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ and demonstrated a new experimental strategy to directly probe light-induced changes in the order parameter's phase with momentum resolution. To do this, we tracked the ultrafast response of a phase-sensitive hybridization gap that appears at the crossing between two bands with opposite superconducting gap signs. Supported by theoretical modeling, we established phase fluctuations as the dominant factor defining the non-thermal response of the unconventional superconducting phase in cuprates.
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Submitted 6 May, 2025;
originally announced May 2025.