Clocking the Melting Transition of Charge and Lattice Order in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mi>T</mml:mi><mml:mtext mathvariant="normal">−</mml:mtext><mml:msub><mml:mi>TaS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>with Ultrafast Extreme-Ultraviolet Angle-Resolved Photoemission Spectroscopy

Petersen, Jesse C.; Kaiser, Stefan; Dean, Nicky; Simoncig, Alberto; Liu, Haiyun; Cavalieri, Adrian L.; Cacho, Céphise; Turcu, I. C. E.; Springate, E.; Frassetto, Fabio; Poletto, Luca; Dhesi, S. S.; Berger, H.; Cavalleri, Andrea

doi:10.1103/physrevlett.107.177402

Cited by 211 publications

(172 citation statements)

References 31 publications

(41 reference statements)

Supporting

Mentioning

164

Contrasting

Order By: Relevance

“…5). The Mott gap collapses quasi-instantaneously within the duration of the pump pulse (30 fs FWHM), with a time constant of less than 20 fs, in agreement with the results of a recent timeresolved ARPES study 18 . This ultrashort timescale is direct evidence for the electronic origin of the gap; it is consistent with an electronic hopping time t hop = / 1 8  W ≈ − fs, which sets the timescale for the response of the correlated electron system to sudden changes 44,45 (here W = 80-400 meV corresponds to the width of the split-off Ta 5d band that straddles E F 10,16,11 ).…”

Section: Systemssupporting

confidence: 89%

“…In a recent time-resolved ARPES study of 1T-TaS 2 (ref. 18), by contrast, only the region around Γ was probed and, due to the better energy resolution compared with our experiment, a sub-vibrational collapse of the subband splitting at about 250 meV below E F (Fig. 2b) was observed.…”

Section: Discussionmentioning

confidence: 60%

“…18), depending on which density component or underlying interaction is the dominant one (at the probed momentum). The observed hierarchy of melting times ultimately seems to reflect three different non-thermal destruction mechanisms following photoexcitation (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…We now set out to answer these questions by time-resolved pump-probe ARPES [16][17][18][19]35,36 using a highharmonic-generation source 37,38 . The central idea is that the timescale on which electronic order in momentum space melts should provide a strong hint as to its predominant nature or origin.…”

Section: Systemsmentioning

confidence: 99%

“…Two prominent examples are 1T-TaS 2 and 1T-TiSe 2 . In these two compounds, the electronic structures [8][9][10][11][12][13][14][15] and ultrafast spectral responses [16][17][18][19] indicate the presence of significant electron correlation effects. In both compounds, electron-electron interactions may in fact have an important role in CDW formation [12][13][14][18][19][20] and in the emergence of superconductivity from CDW states upon intercalation 21 or under pressure 22,23 .…”

mentioning

confidence: 99%

See 4 more Smart Citations

Time-domain classification of charge-density-wave insulators

et al. 2012

View full text Add to dashboard Cite

Distinguishing insulators by the dominant type of interaction is a central problem in condensed matter physics. Basic models include the Bloch-Wilson and the Peierls insulator due to electron-lattice interactions, the mott and the excitonic insulator caused by electron-electron interactions, and the Anderson insulator arising from electron-impurity interactions. In real materials, however, all the interactions are simultaneously present so that classification is often not straightforward. Here, we show that time-and angle-resolved photoemission spectroscopy can directly measure the melting times of electronic order parameters and thus identify-via systematic temporal discrimination of elementary electronic and structural processes-the dominant interaction. specifically, we resolve the debates about the nature of two peculiar charge-density-wave states in the family of transition-metal dichalcogenides, and show that Rb intercalated 1T-Tas 2 is a Peierls insulator and that the ultrafast response of 1T-Tise 2 is highly suggestive of an excitonic insulator.

show abstract

Section: Systemssupporting

confidence: 89%

Section: Discussionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Section: Systemsmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Time-domain classification of charge-density-wave insulators

et al. 2012

View full text Add to dashboard Cite

show abstract

Elementary relaxation processes investigated by femtosecond photoelectron spectroscopy of two‐dimensional materials

Bovensiepen

Kirchmann

2012

Laser & Photonics Reviews

View full text Add to dashboard Cite

Elementary scattering processes in solid matter occur on ultrafast timescales and photoelectron spectroscopy in the time domain represents an excellent tool for their analysis. Conventional photoemission accesses binding energies of electronic states and their momentum dispersion. The use of femtosecond laser pulses in pump‐probe experiments allows obtaining direct insights to the energy and momentum dependence of ultrafast dynamics. This article introduces the elementary interaction processes and emphasizes recent work performed in this rapidly developing field. Decay processes in the low excitation limit are addressed, where electrons decay according to their interaction with carriers in equilibrium. Here, hot electron relaxation in epitaxial metallic film is reviewed. In the limit of an intense optical excitation, scattering of the excited electrons among each other establishes a non‐equilibrium state. Results on charge‐density wave materials and the effect of coherent nuclear motion on the electronic structure, which can break low symmetry ground states, are discussed. Figure reprinted with permission from [71].

show abstract

First‐principles dynamics of photoexcited molecules and materials towards a quantum description

You

Chen

Lian

et al. 2020

WIREs Comput Mol Sci

View full text Add to dashboard Cite

The past decades have witnessed the success of ground‐state density functional theory capturing static electronic properties of various materials. However, for time dependent processes especially those involving excited states, real‐time time‐dependent density functional theory (rt‐TDDFT) and advanced nonadiabatic algorithms are essential, especially for practical simulations of molecules and materials under the occurrence of ultrafast laser field. Here we summarize the recent progresses in developing rt‐TDDFT approaches within numerical atomic orbitals and planewave formalisms, as well as the efforts combining rt‐TDDFT and ring polymer molecular dynamics to take into account nuclear quantum effects in quantum electronic‐nuclear dynamic simulations. Typical applications of first‐principles dynamics of excited electronic states including high harmonic generation, charge density wave, photocatalytic water splitting, as well as quantum nuclear motions in ozone and graphene, are presented to demonstrate the features and advantages of these methods. The progresses in method developments and practical applications provide unprecedented insights into nonadiabatic dynamics of excited states in the Ehrenfest scheme and beyond, towards a comprehensive understanding of excited electronic structure, electron–phonon interactions, photoinduced charge transfer and chemical reactions, as well as quantum nuclear motions in excited states. This article is categorized under: Electronic Structure Theory > Ab Initio Electronic Structure Methods Electronic Structure Theory > Density Functional Theory Molecular and Statistical Mechanics > Molecular Dynamics and Monte‐Carlo Methods

show abstract

Clocking the Melting Transition of Charge and Lattice Order in1T−TaS2with Ultrafast Extreme-Ultraviolet Angle-Resolved Photoemission Spectroscopy

Cited by 211 publications

References 31 publications

Time-domain classification of charge-density-wave insulators

Time-domain classification of charge-density-wave insulators

Elementary relaxation processes investigated by femtosecond photoelectron spectroscopy of two‐dimensional materials

First‐principles dynamics of photoexcited molecules and materials towards a quantum description

Contact Info

Product

Resources

About