Ways to Spin Resolved Core-Hole-Clock Measurements

Feulner, P.; Blobner, Florian; Bauer, J.; Han, Runyuan; Kim, A.; Sundermann, Tobias; Müller, Norbert; Heinzmann, Ulrich; Würth, W.

doi:10.1380/ejssnt.2015.317

Cited by 6 publications

(4 citation statements)

References 38 publications

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“…Moreover, bulk band structures of crystals can be determined by angle-resolved photoelectron spectroscopy (ARPES) combined with photon-energy dependent measurements [40]. Resonant photoemission measurements [41,42] and corehole clock measurements [43,44] are other photoelectron spectroscopy techniques where the photon energy tunability is used.…”

Section: Trxps and Spv A Time-resolved Xpsmentioning

confidence: 99%

A Surface Science Approach to Unveiling the TiO<sub>2</sub> Photocatalytic Mechanism: Correlation between Photocatalytic Activity and Carrier Lifetime

Ozawa

Yamamoto

Mase

et al. 2019

e-J. Surf. Sci. Nanotechnol.

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Establishing an accurate view of the photocatalytic mechanism of titanium dioxide (TiO2) has been a challenging task since the discovery of the Honda-Fujishima effect. Despite the great success of catalytic studies in elucidating the chemical and physical aspects of photocatalysis, many questions remain. A surface science approach, which is characterized by the use of atomically well-defined surfaces in precisely controlled environments, is a powerful tool to shed light on the fundamental mechanism, especially the dynamics of photoexcited carriers. In the present contribution, recent progress in photocatalytic research that correlates photocatalytic activity and carrier dynamics on rutile and anatase TiO2 is reviewed. A special focus is placed on the lifetime of photoexcited carriers. We present a method to determine the carrier lifetime; pump-probe time-resolved soft X-ray photoelectron spectroscopy, utilizing an ultraviolet laser as a pump light and a synchrotron radiation as a probe light. The carrier lifetime is found to be linearly correlated with the photocatalytic decomposition/desorption rate of acetic acid adsorbed on single-crystal TiO2 surfaces. The important role of a potential barrier on the TiO2 surface, which influences the carrier lifetime and the photocatalytic activity, is discussed.

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Section: Trxps and Spv A Time-resolved Xpsmentioning

confidence: 99%

A Surface Science Approach to Unveiling the TiO<sub>2</sub> Photocatalytic Mechanism: Correlation between Photocatalytic Activity and Carrier Lifetime

Ozawa

Yamamoto

Mase

et al. 2019

e-J. Surf. Sci. Nanotechnol.

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“…Along these lines, the spin dependence of electron transfer across interfaces must be understood in detail. While advances in free-electron lasing yield new opportunities to directly resolve such ultrafast processes in time, current experiments based on the core-hole-clock technique − are readily able to access spin-resolved charge transfer times down to the subfemtosecond domain , through spin selective excitation or detection , in the energy domain.…”

mentioning

confidence: 99%

Key Role of the Surface Band Structure in Spin-Dependent Interfacial Electron Transfer: Ar/Fe(110) and Ar/Co(0001)

Müller

Echenique

Sánchez‐Portal

2020

J. Phys. Chem. Lett.

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The injection of spin-polarized electrons across interfaces is central to many technologies, and hence, it is important to understand the main ingredients controlling it. Here, we demonstrate that the spin dependence of ultrafast electron transfer at Ar/Co(0001) and Ar/Fe(110) interfaces is rooted in the details of the spin-split surface band structures. The injection dynamics are particularly sensitive to the sizes (in reciprocal space) of projected electronic band gaps around Γ̅. Our ab initio calculations back that minority electrons are injected significantly faster than majority electrons in line with recently reported experimental injection times. A simple tunnelling model incorporating the spin-dependent gap sizes confirms that this ingredient is crucial to rationalize the experimental results.

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“…Along these lines, the spin-dependence of electron transfer across interfaces must be understood in detail. While advances in free-electron lasing yield new opportunities to directly resolve such ultrafast processes in time [2], current experiments based on the core-hole-clock technique [4][5][6] are readily able to access spin-resolved charge transfer times down to the sub-femtosecond domain [7,8] through spin selective excitation [9] or detection [10,11] in the energy domain.…”

mentioning

confidence: 99%

Theory of Spin-Dependent Electron Transfer Dynamics at Ar/Co(0001) and Ar/Fe(110) Interfaces

Müller,

Echenique,

Sánchez-Portal

2020

Preprint

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Recent core-hole-clock experiments [Phys. Rev. Lett. 112, 086801 (2014)] showed that the spin dependence of electron injection times at Ar/Co(0001) and Ar/Fe(110) interfaces is at variance with the expectations based on previous calculations for related systems. Here we reconcile theory and experiment, and demonstrate that the observed dependence is rooted in the details of the spin-split surface band structures. Our ab initio calculations back that minority electrons are injected significantly faster than majority electrons in line with the experimentally reported ultrashort injection times. The dynamics is particularly sensitive to the size (in reciprocal-space) of the projected band gaps around Γ for both substrates at the resonance energies. A simple tunneling model incorporating the spin-dependent gap sizes further supports these findings.

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Ways to Spin Resolved Core-Hole-Clock Measurements

Cited by 6 publications

References 38 publications

A Surface Science Approach to Unveiling the TiO<sub>2</sub> Photocatalytic Mechanism: Correlation between Photocatalytic Activity and Carrier Lifetime

A Surface Science Approach to Unveiling the TiO<sub>2</sub> Photocatalytic Mechanism: Correlation between Photocatalytic Activity and Carrier Lifetime

Key Role of the Surface Band Structure in Spin-Dependent Interfacial Electron Transfer: Ar/Fe(110) and Ar/Co(0001)

Theory of Spin-Dependent Electron Transfer Dynamics at Ar/Co(0001) and Ar/Fe(110) Interfaces

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