Femtosecond dynamics of electronic states in the Mott insulator 1T-TaS<sub>2</sub>by time resolved photoelectron spectroscopy

Perfetti, L.; Loukakos, P. A.; Lisowski, M.; Bovensiepen, Uwe; Wolf, Martin; Berger, H.; Biermann, Silke; Georges, Antoine

doi:10.1088/1367-2630/10/5/053019

Cited by 182 publications

(207 citation statements)

References 44 publications

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“…Yet, the ARPES snapshots in Fig. 3a-d display qualitative electronic structure changes happening within 65-210 fs after excitation, which is much faster than the 0.35-4 ps it takes to transfer the excess energy in the electron system to the phonon bath 16,17,19,[39][40][41] . These changes therefore do not reflect transitions to quasi-equilibrium states at elevated effective temperatures, although the band maps look fairly similar to temperature-dependent equilibrium ARPES data 9,[12][13][14] .…”

Section: Systemsmentioning

confidence: 97%

“…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 .…”

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confidence: 99%

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Time-domain classification of charge-density-wave insulators

et al. 2012

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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.

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Section: Systemsmentioning

confidence: 97%

Section: Systemsmentioning

confidence: 99%

mentioning

confidence: 99%

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Time-domain classification of charge-density-wave insulators

et al. 2012

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“…Layered transition metal dichalcogenides, such as 1T-TaS 2 , 2H-TaSe 2 , and 1T-TiSe 2 , have received renewed interest in recent years due to a wealth of physics, [1][2][3][4][5] ranging from charge density waves (CDWs) 6,7 to metal-insulator transitions 8 and superconductivity. 3 Particularly, 1T-TaS 2 has been extensively investigated because of its rich phase behavior as a function of the temperature.…”

Section: Introductionmentioning

confidence: 99%

“…3 Particularly, 1T-TaS 2 has been extensively investigated because of its rich phase behavior as a function of the temperature. 1,3,4,[9][10][11][12] At 540 K an incommensurate CDW develops from the undistorted metallic structure, at 350 K an almost commensurate CDW is adopted, and further cooling to 180 K leads to a commensurate CDW, which exhibits a "Star-of-David" structure with an inplane √13 × √13 periodic lattice distortion. The origin of the CDW, the pseudo-gapped Fermi surface, and the rich phase diagram are some of the topics that have motivated experimental and theoretical studies.…”

Section: Introductionmentioning

confidence: 99%

Strain tuning of the charge density wave in monolayer and bilayer 1T-TaS₂

Gan

Zhang

et al. 2016

Phys. Chem. Chem. Phys.

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By first-principles calculations, we investigate the strain effects on the charge density wave states of monolayer and bilayer 1T-TaS 2 . The modified stability of the charge density wave in the monolayer is understood in terms of the strain dependent electron localization, which determines the distortion amplitude. On the other hand, in the bilayer the effect of strain on the interlayer interaction is also crucial. The rich phase diagram under strain opens new venues for applications of 1T-TaS 2 . We interpret the experimentally observed insulating state of bulk 1T-TaS 2 as inherited from the monolayer by effective interlayer decoupling.

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Femtosecond Time‐ and Angle‐Resolved Photoemission as a Real‐time Probe of Cooperative Effects in Correlated Electron Materials

Kirchmann

Perfetti

Wolf

et al. 2010

Dynamics at Solid State Surfaces and Interfaces

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IntroductionMany-body and correlation effects in solid-state physics manifest in specific signatures of the electronic band structure. The interaction of electrons with elementary excitations of the solid results in renormalization of the single-particle band structure due to, for example, electron-phonon, electron-magnon, and electron-electron interactions. This is explained in more detail in Volume 2 (Chapter 2) and this volume (Chapter 8). In particular for highly correlated materials such as charge (or spin) density wave materials, Mott insulators, and superconductors, such many-body effects are key to understanding macroscopic properties, for example, the electrical conductivity. Due to competition of these correlations with thermal fluctuations, phase transitions to ordered ground states with broken symmetry occur with decreasing temperature. Below the respective critical temperatures, the electronic system gains stability by opening of a bandgap (see Volume 2, Chapter 1). Understanding these many-particle effects is one goal of present efforts in solid-state physics.From an experimental point of view, angle-resolved photoelectron spectroscopy (ARPES) is the method of choice to analyze the electronic band structure of a solid [1,2]. It retrieves the information on the electronic states from the energy and the momentum of the photoelectrons emitted by a monochromatic photon source (see Volume 2, Chapter 3). This conversion is possible because the kinetic energy of the photoelectron is related to the binding energy of the photohole left behind. Furthermore, the translational symmetry of the surface guaranties that the momentum component of the photoelectron and of the photohole parallel to the surface are identical. However, the photoelectron wave vector perpendicular to the surface is not conserved due to the photoemission process. This limitation can be overcome if the material has a quasi-two-dimensional band structure. In this case, the angle-dependent photoelectron intensity represents the spectral function A k ðvÞ multiplied by the Fermi-Dirac distribution f ðvÞ.

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Femtosecond dynamics of electronic states in the Mott insulator 1T-TaS₂by time resolved photoelectron spectroscopy

Cited by 182 publications

References 44 publications

Time-domain classification of charge-density-wave insulators

Time-domain classification of charge-density-wave insulators

Strain tuning of the charge density wave in monolayer and bilayer 1T-TaS₂

Femtosecond Time‐ and Angle‐Resolved Photoemission as a Real‐time Probe of Cooperative Effects in Correlated Electron Materials

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Femtosecond dynamics of electronic states in the Mott insulator 1T-TaS2by time resolved photoelectron spectroscopy

Cited by 182 publications

References 44 publications

Time-domain classification of charge-density-wave insulators

Time-domain classification of charge-density-wave insulators

Strain tuning of the charge density wave in monolayer and bilayer 1T-TaS2

Femtosecond Time‐ and Angle‐Resolved Photoemission as a Real‐time Probe of Cooperative Effects in Correlated Electron Materials

Contact Info

Product

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Femtosecond dynamics of electronic states in the Mott insulator 1T-TaS₂by time resolved photoelectron spectroscopy

Strain tuning of the charge density wave in monolayer and bilayer 1T-TaS₂