Electron Dynamics of Silicon Surface States: Second-Harmonic Hole Burning on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Si</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>111</mml:mn><mml:mo stretchy="false">)</mml:mo><mml:mtext mathvariant="normal">−</mml:mtext><mml:mo stretchy="false">(</mml:mo><mml:mn>7</mml:mn><mml:mo>×</mml:mo><mml:mn>7</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>

McGuire, John A.; Raschke, Markus B.; Shen, Y. R.

doi:10.1103/physrevlett.96.087401

Cited by 5 publications

(3 citation statements)

References 35 publications

(24 reference statements)

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“…While all these examples represent basically static SH experiments for structural characterization of TMD materials, time-resolved SHG has been applied in particular to study the dynamics of various phenomena at surfaces and interfaces of bulk semiconductors. Its sensitivity to symmetry changes and to interface electronic states has been exploited for timedomain investigations of phase transformations [45,46], of adsorbate reactions [47], of interface-specific electron dynamics [48][49][50] and to detect transient electric fields at interfaces [51][52][53]. Those time-resolved experiments on TMD samples have to cope with the small flake/domain size of exfoliated and CVD grown samples available at the moment.…”

Section: Time-resolved Shg On Tmdsmentioning

confidence: 99%

Second-harmonic imaging microscopy for time-resolved investigations of transition metal dichalcogenides

Zimmermann¹,

Hone

et al. 2020

J. Phys.: Condens. Matter

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Two-dimensional transition metal dichalcogenides (TMD) have shown promise for various applications in optoelectronics and so-called valleytronics. Their operation and performance strongly depend on the stacking of individual layers. Here, optical second-harmonic generation in imaging mode is shown to be a versatile tool for systematic time-resolved investigations of TMD monolayers and heterostructures in consideration of the material’s structure. Large sample areas can be probed without the need of any mapping or scanning. By means of polarization dependent measurements, the crystalline orientation of monolayers or the stacking angles of heterostructures can be evaluated for the whole field of view. Pump-probe experiments then allow to correlate observed transient changes of the second-harmonic response with the underlying structure. The corresponding time-resolution is virtually limited by the pulse duration of the used laser. As an example, polarization dependent and time-resolved measurements on mono- and multilayer MoS2 flakes grown on a SiO2/ Si(001) substrate are presented.

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Section: Time-resolved Shg On Tmdsmentioning

confidence: 99%

Second-harmonic imaging microscopy for time-resolved investigations of transition metal dichalcogenides

Zimmermann¹,

Hone

et al. 2020

J. Phys.: Condens. Matter

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show abstract

“…Time-resolved SHG has also been applied to study the dynamics of various phenomena at surfaces and interfaces of bulk semiconductors. Its sensitivity to symmetry changes and to interface electronic states has been exploited for time-domain investigations of phase transformations [54,55], of adsorbate reactions [56], of interface-specific electron dynamics [57][58][59] and to the detection of transient electric fields at interfaces [60][61][62]. One has to point out that the high sensitivity of SHG to the discussed quantities allows one to explore very small effects.…”

Section: Time-resolved Shg On Tmdcsmentioning

confidence: 99%

Second-harmonic imaging microscopy for time-resolved investigations of transition metal dichalcogenides

Zimmermann,

Li,

Hone

et al. 2016

Preprint

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Heterostructures of two-dimensional transition metal dichalcogenides (TMDC) have shown promise for various applications in optoelectronics and so-called valleytronics. Their operation and performance strongly depend on the stacking of individual layers. Here, optical second-harmonic generation (SHG) in imaging mode is shown to be a versatile tool for systematic time-resolved investigations of TMDC monolayers and heterostructures in consideration of the material's structure.Large sample areas can be probed in a single shot without the need of any mapping or scanning.By means of polarization dependent measurements, the crystalline orientation of monolayers or the stacking angles of heterostructures can be evaluated for the whole field of view. Pump-probe experiments then allow to correlate observed transient changes of the second harmonic response with the underlying structure. The corresponding time-resolution is virtually limited by the pulse duration of the used laser. As an example, polarization dependent and time-resolved measurements on single-layer MoS 2 and WS 2 flakes grown on a SiO 2 / Si(001) substrate are presented.

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“…Only a few recent examples can be mentioned in this overview. SHG spectral hole burning in the dangling bond states of Si(111)-7 × 7, using 100 fs pulses, revealed strong coupling between these localized surface states and a surface phonon mode [126]. Pump-probe techniques are also used to measure slower processes.…”

Section: Temporal Studiesmentioning

confidence: 99%

Probing surface and interface structure using optics

McGilp

2010

J. Phys.: Condens. Matter

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Optical techniques for probing surface and interface structure are introduced and recent developments in the field are discussed. These techniques offer significant advantages over conventional surface probes: all pressure ranges of gas-condensed matter interfaces are accessible and liquid-liquid, liquid-solid and solid-solid interfaces can be probed, due to the large penetration depth of the optical radiation. Sensitivity and discrimination from the bulk are the two challenges facing optical techniques in probing surface and interface structure. Where instrumental improvements have resulted in enhanced sensitivity, conventional optical techniques can be used to characterize heterogeneous adsorbed layers on a substrate, often with sub-monolayer resolution. Nanoscale lateral resolution is possible using scanning near-field optics. A separate class of techniques, which includes reflection anisotropy spectroscopy, and nonlinear optical probes such as second-harmonic and sum-frequency generation, uses the difference in symmetry between the bulk and the surface or interface to suppress the bulk contribution. A perspective is presented of likely future developments in this rapidly expanding field.

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Electron Dynamics of Silicon Surface States: Second-Harmonic Hole Burning onSi(111)−(7×7)

Cited by 5 publications

References 35 publications

Second-harmonic imaging microscopy for time-resolved investigations of transition metal dichalcogenides

Second-harmonic imaging microscopy for time-resolved investigations of transition metal dichalcogenides

Second-harmonic imaging microscopy for time-resolved investigations of transition metal dichalcogenides

Probing surface and interface structure using optics

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