Ultrafast destruction and recovery of the spin density wave order in iron-based pnictides: A multipulse optical study

Naseska, M.; Pogrebna, A.; Cao, Guanghan; Xu, Z. A.; Mihailović, D.; Mertelj, T.

doi:10.1103/physrevb.98.035148

Cited by 13 publications

(11 citation statements)

References 48 publications

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“…Each reservoir is presumed to be in quasithermal equilibrium with a particular "temperature," based on the assumption that the heat equilibration within each reservoir, e.g., due to electron-electron scattering within electronic reservoir and anharmonic interactions for phonon baths, is much faster than the inter-reservoir energy transfer [15]. The usefulness of multitemperature models is widely evidenced in studies of energy transfer in heterostructures [16], hot electron cooling in two-dimensional materials and superconductors [17,18], and photoinduced spin dynamics and phase transitions [8,11,[19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Electron thermalization and relaxation in laser-heated nickel by few-femtosecond core-level transient absorption spectroscopy

et al. 2021

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Direct measurements of photoexcited carrier dynamics in nickel are made using few-femtosecond extreme ultraviolet (XUV) transient absorption spectroscopy at the nickel M 2,3 edge. It is observed that the core-level absorption line shape of photoexcited nickel can be described by a Gaussian broadening (σ ) and a red shift (ω s ) of the ground-state absorption spectrum. Theory predicts and the experimental results verify that after initial rapid carrier thermalization, the electron temperature increase ( T ) is linearly proportional to the Gaussian broadening factor σ , providing quantitative real-time tracking of the relaxation of the electron temperature. Measurements reveal an electron cooling time for 50 nm thick polycrystalline nickel films of 640 ± 80 fs. With hot thermalized carriers, the spectral red shift exhibits a power-law relationship with the change in electron temperature of ω s ∝ T 1.5 . Rapid electron thermalization via carrier-carrier scattering accompanies and follows the nominal 4-fs photoexcitation pulse until the carriers reach a quasithermal equilibrium. Entwined with a <6 fs instrument response function, carrier thermalization times ranging from 34 fs to 13 fs are estimated from experimental data acquired at different pump fluences and it is observed that the electron thermalization time decreases with increasing pump fluence. The study provides an initial example of measuring electron temperature and thermalization in metals in real time with XUV light, and it lays a foundation for further investigation of photoinduced phase transitions and carrier transport in metals with core-level absorption spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Electron thermalization and relaxation in laser-heated nickel by few-femtosecond core-level transient absorption spectroscopy

et al. 2021

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“…Dynamics of phase transitions associated with spontaneous symmetry breaking remains an interesting subject both theoretically and experimentally. Thanks to the advances in time-resolved pump-probe techniques, it is now possible [1][2][3][4][5][6][7][8][9] to perturb an ordered state and then monitor its fast non-adiabatic recovery. For strong perturbations, one can observe a passage through an ordering transition, register the emergence of ordered phases, and measure time evolution of diverse system parameters with a subpicosecond resolution.…”

Section: Introductionmentioning

confidence: 99%

Amplitude dynamics of the charge density wave in LaTe3 : Theoretical description of pump-probe experiments

et al. 2020

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We formulate a dynamical model to describe a photo-induced charge density wave (CDW) quench transition and apply it to recent multi-probe experiments on LaTe3 [A. Zong et al., Nat. Phys. 15, 27 (2019)]. Our approach relies on coupled time-dependent Ginzburg-Landau equations tracking two order parameters that represent the modulations of the electronic density and the ionic positions. We aim at describing the amplitude of the order parameters under the assumption that they are homogeneous in space. This description is supplemented by a three-temperature model, which treats separately the electronic temperature, temperature of the lattice phonons with stronger couplings to the electronic subsystem, and temperature of all other phonons. The broad scope of available data for LaTe3 and similar materials as well as the synergy between different time-resolved spectroscopies allow us to extract model parameters. The resulting calculations are in good agreement with ultrafast electron diffraction experiments, reproducing qualitative and quantitative features of the CDW amplitude evolution during the initial few picoseconds after photoexcitation.

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“…In addition to the T IM increase, the pump optical penetration depth could increase due to the optical-transition bleaching at high-F resulting in saturation of the absorbed energy density. 42 Such saturation cannot be entirely excluded and the maximum experimental T eff indeed does not appear to significantly exceed T IM ′ (Fig- ures 4 (d) and 6 (d)). We should note, however, that at the high excitation T eff does not directly correspond to the most excited volume region since the CO are inhomogeneously suppressed so T eff is somewhat weighted towards the less-excited volume region.…”

Section: Discussionmentioning

confidence: 91%

“…The multi-pulse transient reflectivity measurements. 41,42 were performed using 50-fs linearly polarized laser pulses at 800 nm wavelength and the 200 − 250 kHz repetition rate. In addition to the pump (P) and probe (Pr) pulses at ω = 1.55 eV we used another intense driving (D) pulse (also at ω = 1.55 eV) with a variable delay with respect to the pump (P) pulse (see Figure 2).…”

Section: Multi-pulse Transient Reflectivity Measurementsmentioning

confidence: 99%

First-order kinetics bottleneck during photoinduced ultrafast insulator-metal transition in 3D orbitally-driven Peierls insulator CuIr$_{2}$S$_{4}$

Naseska,

Sutar,

Vaskivskyi

et al. 2021

Preprint

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The spinel-structure CuIr2S4 compound displays a rather unusual orbitally-driven threedimensional Peierls-like insulator-metal transition. The low-T symmetry-broken insulating state is especially interesting due to the existence of a metastable irradiation-induced disordered weakly conducting state. Here we study intense femtosecond optical pulse irradiation effects by means of the all-optical ultrafast multi-pulse time-resolved spectroscopy. We show that the structural coherence of the low-T broken symmetry state is strongly suppressed on a sub-picosecond timescale above a threshold excitation fluence resulting in a structurally inhomogeneous transient state which persists for several-tens of picoseconds before reverting to the low-T disordered weakly conducting state. The electronic order shows a transient gap filling at a significantly lower fluence threshold. The data suggest that the photoinduced-transition dynamics to the high-T metallic phase is governed by first-order-transition nucleation kinetics that prevents the complete ultrafast structural transition even when the absorbed energy significantly exceeds the equilibrium enthalpy difference to the high-T metallic phase. In contrast, the dynamically-decoupled electronic order is transiently suppressed on a sub-picosecond timescale rather independently due to a photoinduced Mott transition.

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Ultrafast destruction and recovery of the spin density wave order in iron-based pnictides: A multipulse optical study

Cited by 13 publications

References 48 publications

Electron thermalization and relaxation in laser-heated nickel by few-femtosecond core-level transient absorption spectroscopy

Electron thermalization and relaxation in laser-heated nickel by few-femtosecond core-level transient absorption spectroscopy

Amplitude dynamics of the charge density wave in LaTe3 : Theoretical description of pump-probe experiments

First-order kinetics bottleneck during photoinduced ultrafast insulator-metal transition in 3D orbitally-driven Peierls insulator CuIr$_{2}$S$_{4}$

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