Atomistic Picture of Charge Density Wave Formation at Surfaces

Wall, Simone; Krenzer, B.; Wippermann, Stefan Martin; Sanna, Simone; Klasing, F.; Hanisch-Blicharski, Anja; Kammler, M.; Schmidt, Wolf Gero; Hoegen, M. Horn‐von

doi:10.1103/physrevlett.109.186101

Cited by 77 publications

(77 citation statements)

References 27 publications

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“…Thereafter, no further change of intensity is expected for this process [dashed line in Fig. 2(a)] since the metastable

false(4 \times 1 false)

phase survives for nanoseconds 37,38 …”

Section: Resultsmentioning

confidence: 99%

“…1(a)]. Both structural phases are separated from each other by an energy barrier of about 40 meV 37,38 . Shortly after the laser pulse excites the surface, the PES transiently changes 36 and the surface undergoes a phase transition to the energetically favoured

false(4 \times 1 false)

structure on sub-ps timescales 13 .…”

Section: Atomic Wire System Si(111)(8 × 2) ↔ (4 × 1)-inmentioning

confidence: 99%

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Non-equilibrium lattice dynamics of one-dimensional In chains on Si(111) upon ultrafast optical excitation

Frigge

Hafke

Witte

et al. 2018

Structural Dynamics

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The photoinduced structural dynamics of the atomic wire system on the Si(111)-In surface has been studied by ultrafast electron diffraction in reflection geometry. Upon intense fs-laser excitation, this system can be driven in around 1 ps from the insulating false(8×2false) reconstructed low temperature phase to a metastable metallic false(4×1false) reconstructed high temperature phase. Subsequent to the structural transition, the surface heats up on a 6 times slower timescale as determined from a transient Debye-Waller analysis of the diffraction spots. From a comparison with the structural response of the high temperature false(4×1false) phase, we conclude that electron-phonon coupling is responsible for the slow energy transfer from the excited electron system to the lattice. The significant difference in timescales is evidence that the photoinduced structural transition is non-thermally driven.

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“…Thereafter, no further change of intensity is expected for this process [dashed line in Fig. 2(a)] since the metastable

false(4 \times 1 false)

phase survives for nanoseconds 37,38 …”

Section: Resultsmentioning

confidence: 99%

false(4 \times 1 false)

structure on sub-ps timescales 13 .…”

Section: Atomic Wire System Si(111)(8 × 2) ↔ (4 × 1)-inmentioning

confidence: 99%

Non-equilibrium lattice dynamics of one-dimensional In chains on Si(111) upon ultrafast optical excitation

Frigge

Hafke

Witte

et al. 2018

Structural Dynamics

View full text Add to dashboard Cite

show abstract

“…2(f)). While time-resolved reflection high-energy electron diffraction can well reveal surface-dominated dynamics, 34 we here study largely the bulk material, by measuring rough surfaces and Bragg reflections with rather high Miller indices at incidence angles of ∼5°. This is evident from the transmission-like diffraction patterns (Fig.…”

Section: Resultsmentioning

confidence: 99%

Ultrafast electron crystallography of the cooperative reaction path in vanadium dioxide

Yang

Baum

Zewail

2016

Structural Dynamics

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Time-resolved electron diffraction with atomic-scale spatial and temporal resolution was used to unravel the transformation pathway in the photoinduced structural phase transition of vanadium dioxide. Results from bulk crystals and single-crystalline thin-films reveal a common, stepwise mechanism: First, there is a femtosecond V−V bond dilation within 300 fs, second, an intracell adjustment in picoseconds and, third, a nanoscale shear motion within tens of picoseconds. Experiments at different ambient temperatures and pump laser fluences reveal a temperature-dependent excitation threshold required to trigger the transitional reaction path of the atomic motions.

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“…Global characteristics such as the transition temperature (T c ) and transport property of this In/Si(111)-4×1 surface have been reported to be affected significantly by small amounts of defects [13,[20][21][22][23][24][25][26][27][28]. In a recent series of diffraction experiments, the defects created by depositing metal atoms (In and Na) or by exposing the surface to gases (hydrogen and oxygen) were found to change the transition temperature [23][24][25]27].…”

Section: Introductionmentioning

confidence: 99%

Initial stages of oxygen adsorption onIn/Si(111)-4×1

et al. 2014

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The In/Si(111)4×1 surface with In wires is a prototypical one-dimensional electron system showing a temperature-induced structural phase transition. While most impurities are known to decrease the transition temperature (T c ), oxygen was reported to increase the T c . In order to understand the exceptional influence of oxygen, we have examined the initial stages of oxygen adsorption on the surface by scanning tunneling microscopy (STM) and density-functional theory (DFT) calculations. Oxygen molecules were found to dissociate and adsorb as atoms on the surface. STM revealed three distinct O adsorption features as well as occasional transformations from one to another. The high-resolution images showed that all three adsorbed O features were located at the center of the In trimer at both edges of the In wire. This registry is in contradiction with the previous theoretical predictions [S. Wippermann et al., Phys. Rev. Lett. 100, 106802 (2008)]. The present DFT calculations identified two of the features as O atoms incorporated in the interstitial region between the In wire and subsurface Si layer.

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Atomistic Picture of Charge Density Wave Formation at Surfaces

Cited by 77 publications

References 27 publications

Non-equilibrium lattice dynamics of one-dimensional In chains on Si(111) upon ultrafast optical excitation

Non-equilibrium lattice dynamics of one-dimensional In chains on Si(111) upon ultrafast optical excitation

Ultrafast electron crystallography of the cooperative reaction path in vanadium dioxide

Initial stages of oxygen adsorption onIn/Si(111)-4×1

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