Evidence for topological defects in a photoinduced phase transition

Zong, Alfred; Kogar, Anshul; Bie, Ya‐Qing; Rohwer, Timm; Lee, Changmin; Baldini, Edoardo; Ergeçen, Emre; Yılmaz, Mehmet; Freelon, B.; Sie, Edbert J.; Zhou, Hao; Straquadine, Joshua; Walmsley, Philip; Dolgirev, Pavel E.; Rozhkov, A. V.; Fisher, I. R.; Jarillo‐Herrero, Pablo; Fine, Boris V.; Gedik, Nuh

doi:10.1038/s41567-018-0311-9

Cited by 164 publications

(231 citation statements)

References 33 publications

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“…The experiments of Ref. 8 produced evidence that the relaxation of the phase is significantly slower than that of the amplitude. The slowness of the phase relaxation was interpreted as being due to the presence of topological defects.…”

Section: Introductionmentioning

confidence: 99%

“…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%

“…Recently, we reported [ 8] results of an experimental multi-probe study of a photo-induced CDW transition in a member of the rare-earth tritelluride family LaTe 3 . In these experiments, the post-pump relaxation was monitored with the help of three different time-resolved tech-niques: ultra-fast electron diffraction (UED), transient reflectivity, and time-and angle-resolved photo-emission spectroscopy (tr-ARPES).…”

Section: Introductionmentioning

confidence: 99%

“…In the present paper, the experiments of Ref. 8 will serve as the primary testing ground for a rather general theoretical approach.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In the present paper, the experiments of Ref. 8 will serve as the primary testing ground for a rather general theoretical approach.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2020

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“…Prior tr-ARPES measurements on TbTe3 identified amplitude modes 6 and demonstrated that the CDW state may be transiently stabilized upon near-infrared excitation 33 . A previous work using this 11 eV setup also identified a photoinduced CDW phase transition whose recovery dynamics is mediated through topological defects 34 .…”

Section: Erte3 Measurements -Recovery Dynamics Of Two Cdw Regionsmentioning

confidence: 65%

High resolution time- and angle-resolved photoemission spectroscopy with 11 eV laser pulses

Lee

Rohwer

Sie

et al. 2020

Review of Scientific Instruments

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Performing time and angle resolved photoemission spectroscopy (tr-ARPES) at high momenta necessitates extreme ultraviolet laser pulses, which are typically produced via high harmonic generation (HHG). Despite recent advances, HHG-based setups still require large pulse energies (hundreds of µ J to mJ) and their energy resolution is limited to tens of meV. Here, we present a novel 11 eV tr-ARPES setup that generates a flux of 5× 10 10 photons/s and achieves an unprecedented energy resolution of 16 meV. It can be operated at high repetition rates (up to 250 kHz) while using input pulse energies down to 3 µ J. We demonstrate these unique capabilities by simultaneously capturing the energy and momentum

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Recent Advances in 2D Rare Earth Materials

Chen

Han

Zhao

et al. 2020

Adv Funct Materials

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2D rare earth (RE) materials have received considerable attention in recent years due to the fascinating luminescence, magnetism, and electric properties originated from RE associated with sharp and various emission peaks, intrinsic 2D ferromagnetism, and incommensurate charge density wave. These materials might open up a new prospect in next‐generation lighting, magnetic devices, and phototransistors. Herein, a comprehensive review of 2D RE materials is presented, focusing on their recent progresses. First, the crystal structures of 2D RE materials are discussed. Then, typical synthesis methods such as mechanical exfoliation, molecular beam epitaxy, pulsed laser deposition, and chemical vapor deposition are introduced. Furthermore, various properties in luminescence, magnetism, and electronics are summarized. The recently reported RE‐based 2D novel photodetectors are outlined as three constructions: MoS2/RE, graphene/RE, and perovskite/RE, which show promising applications for both narrow and broad band detection arised from the special absorption windows of different RE elements. Finally, the conclusions and outlook of this area are proposed, such as exploring novel 2D RE compounds, improving stability, and broadening applications.

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Evidence for topological defects in a photoinduced phase transition

Cited by 164 publications

References 33 publications

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

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

High resolution time- and angle-resolved photoemission spectroscopy with 11 eV laser pulses

Recent Advances in 2D Rare Earth Materials

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