Witnessing the formation and relaxation of dressed quasi-particles in a strongly correlated electron system

Novelli, Fabio; Filippis, G. De; Cataudella, V.; Esposito, Martina; Vergara, I.; Cilento, Federico; Sindici, Enrico; Amaricci, A.; Giannetti, Claudio; Prabhakaran, D.; Wall, Simon; Perucchi, A.; Conte, Stefano Dal; Cerullo, Giulio; Capone, Massimo; Mishchenko, A. S.; Grüninger, M.; Nagaosa, Naoto; Parmigiani, F.; Fausti, Daniele

doi:10.1038/ncomms6112

Cited by 72 publications

(86 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…No physical correction of the chirp of the broadband white light pulses was performed, but a post-processing correction of the chirp was applied to the data. Corrections to compensate the mismatch between the penetration depths at the pump photon-energy and at the various probe photon-energies (as described by Novelli et al 28 ) have been found not to be significant. The experiment was performed with the sample at 35 K, 80 K, and 140 K, the latter one being above the Verwey transition temperature.…”

Section: Methodsmentioning

confidence: 99%

Phase separation in the nonequilibrium Verwey transition in magnetite

et al. 2016

View full text Add to dashboard Cite

We present equilibrium and out-of-equilibrium studies of the Verwey transition in magnetite. In the equilibrium optical conductivity, we find a step-like change at the phase transition for photon energies below about 2 eV. The possibility of triggering a non-equilibrium transient metallic state in insulating magnetite by photo excitation was recently demonstrated by an x-ray study. Here we report a full characterization of the optical properties in the visible frequency range across the nonequilibrium phase transition. Our analysis of the spectral features is based on a detailed description of the equilibrium properties. The out-of-equilibrium optical data bear the initial electronic response associated to localized photo-excitation, the occurrence of phase separation, and the transition to a transient metallic phase for excitation density larger than a critical value. This allows us to identify the electronic nature of the transient state, to unveil the phase transition dynamics, and to study the consequences of phase separation on the reflectivity, suggesting a spectroscopic feature that may be generally linked to out-of-equilibrium phase separation.

show abstract

Section: Methodsmentioning

confidence: 99%

Phase separation in the nonequilibrium Verwey transition in magnetite

et al. 2016

View full text Add to dashboard Cite

show abstract

“…One of the prototypical targets for the nonequilibrium many-body systems is the Mott insulator and the carrier-doped Mott insulator. A variety of exotic nonequlibrium phenomena emerges owing to the spin and orbital degrees of freedom, [3][4][5][6][7][8][9][10][11] and a number of theoretical studies has been also performed in the optical induced nonequilibrium state in the Mott insulators. [12][13][14][15][16][17][18][19][20][21] Another promising target for the photoinduced nonequilibrium dynamics in correlated electron systems is the charge ordered (CO) state, in which the averaged electron density per site is 0.5 in most of the cases.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced charge-order melting dynamics in a one-dimensional interacting Holstein model

Hashimoto¹,

Ishihara²

2017

Phys. Rev. B

View full text Add to dashboard Cite

Transient quantum dynamics in an interacting fermion-phonon system are investigated. In particular, a charge order (CO) melting after a short optical-pulse irradiation and roles of the quantum phonons on the transient dynamics are focused on. A spinless-fermion model in a one-dimensional chain coupled with local phonons is analyzed numerically. The infinite time-evolving block decimation algorithm is adopted as a reliable numerical method for one-dimensional quantum many-body systems. Numerical results for the photoinduced CO melting dynamics without phonons are well interpreted by the soliton picture for the CO domains. This interpretation is confirmed by the numerical simulation for an artificial local excitation and the classical soliton model. In the case of the large phonon frequency corresponding to the antiadiabatic condition, the CO melting is induced by propagations of the polaronic solitons with the renormalized soliton velocity. On the other hand, in the case of the small phonon frequency corresponding to the adiabatic condition, the first stage of the CO melting dynamics occurs due to the energy transfer from the fermionic to phononic systems, and the second stage is brought about by the soliton motions around the bottom of the soliton band. Present analyses provide a standard reference for the photoinduced CO melting dynamics in low-dimensional many-body quantum systems.

show abstract

“…By shining the sample with intense ultrafast pulses (pump) one can trigger nonequilibrium transient states, whose physical properties are then recorded by a second pulse (probe) which hits the sample with a given time delay. This approach opens up a wealth of information unavailable to conventional time-averaged spectroscopies [1][2][3][4][5][6][7][8][9]. When used in combination with angle-resolved photoemission spectroscopy (ARPES), these ultrafast methods allow us to track and follow in real time the evolution of quasiparticle modes in different momentum sectors, such as those close to the gap nodes and antinodes of d-wave cuprate superconductors [10][11][12].…”

mentioning

confidence: 99%

Transient Dynamics ofd-Wave Superconductors after a Sudden Excitation

2015

Self Cite

View full text Add to dashboard Cite

Motivated by recent ultrafast pump-probe experiments on high-temperature superconductors, we discuss the transient dynamics of a d-wave BCS model after a quantum quench of the interaction parameter. We find that the existence of gap nodes, with the associated nodal quasiparticles, introduces a decay channel which makes the dynamics much faster than in the conventional s-wave model. For every value of the quench parameter, the superconducting gap rapidly converges to a stationary value smaller than the one at equilibrium. Using a sudden approximation for the gap dynamics, we find an analytical expression for the reduction of spectral weight close to the nodes, which is in qualitative agreement with recent experiments.PACS numbers: 74.20.Rp,74.40.Gh,05.70.Ln Introduction. -Recent advances in time-resolved spectroscopies have triggered a growing interest in the transient dynamical behavior of high-temperature superconductors optically excited far from equilibrium. By shining the sample with intense ultrafast pulses (pump) one can trigger nonequilibrium transient states, whose physical properties are then recorded by a second pulse (probe) which hits the sample with a given time delay. This approach opens up a wealth of information unavailable to conventional time-averaged spectroscopies [1][2][3][4][5][6][7][8][9]. When used in combination with angle-resolved photoemission spectroscopy (ARPES), these ultrafast methods allow us to track and follow in real time the evolution of quasiparticle modes in different momentum sectors, such as those close to the gap nodes and antinodes of d-wave cuprate superconductors [10][11][12]. In addition, when irradiation is sufficiently strong and optically tailored in such a way to selectively excite specific modes, one can even stabilize transient states with fundamentally different physical properties [13][14][15]. A spectacular example is given by recent experiments reporting signatures of light-induced metastable superconductivity in cuprates at much higher temperature than at equilibrium [16,17].

show abstract

Witnessing the formation and relaxation of dressed quasi-particles in a strongly correlated electron system

Cited by 72 publications

References 54 publications

Phase separation in the nonequilibrium Verwey transition in magnetite

Phase separation in the nonequilibrium Verwey transition in magnetite

Photoinduced charge-order melting dynamics in a one-dimensional interacting Holstein model

Transient Dynamics ofd-Wave Superconductors after a Sudden Excitation

Contact Info

Product

Resources

About