Multilevel perspective on high-order harmonic generation in solids

Wu, Mengxi; Browne, D. A.; Schafer, Kenneth J.; Gaarde, Mette B.

doi:10.1103/physreva.94.063403

Cited by 115 publications

(109 citation statements)

References 48 publications

(114 reference statements)

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“…While the model agrees with quantum‐mechanical simulations, e.g. reproducing the time frequency characteristics of the harmonic emission, it is limited to materials with only stepwise, sequential transitions from band to band. Furthermore, transitions between bands occur only around bandgap minima.…”

Section: Microscopic Theory Of Strong‐field Excitations In Semiconducmentioning

confidence: 58%

“…As the creation of polarization and charge carriers, as well as their acceleration inside the bands are strongly coupled, both emission sources contribute simultaneously to the total emission

E_{out} false(t false) \propto \frac{\partial}{\partial t} P false(t false) + J false(t false)

. The frequency spectrum is obtained by a Fourier transform of

E_{out} false(t false)

and reads

\begin{matrix} true \\ right I_{out} false(ω false) = | E_{out} {(ω) false|}^{2} \propto {false| ω P (ω) + normali J (ω) false|}^{2} . \end{matrix}

Questions concerning the relative importance of the emission sources in a strongly excited semiconductor as well as the interplay between them are a topic of ongoing discussions . Nevertheless, both emission sources are intrinsically coupled and equally important as demonstrated in Refs.…”

Section: Microscopic Theory Of Strong‐field Excitations In Semiconducmentioning

confidence: 99%

“…With the same goal of an intuitive picture of HHG, References [] suggest a semi‐classical trajectory picture in momentum space. It considers multiple bands and is motivated by quantum‐mechanical simulations.…”

Section: Microscopic Theory Of Strong‐field Excitations In Semiconducmentioning

confidence: 99%

“…Also Refs. [] underpin the importance to consider multiple electronic bands in HHG studies to capture the polarization and carrier dynamics in multiple‐bands. Reference [], therefore, suggests to include the full electronic structure of the semiconductor in combination with the accurate crystal structure directly with an ab‐initio method, applying time‐dependent density‐functional theory.…”

Section: Microscopic Theory Of Strong‐field Excitations In Semiconducmentioning

confidence: 99%

See 3 more Smart Citations

Ultrahigh Off‐Resonant Field Effects in Semiconductors

Huttner

Kira

Koch

2017

Laser & Photonics Reviews

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The excitation of semiconductors with short, off-resonant, high-power terahertz pulses yields extremely nonlinear, ultrafast, dynamical processes including very-high harmonic generation, the occurence of high-order sidebands, dynamical Bloch oscillations, as well as quasi-particle collisions. This review overviews the experimental findings and the microscopic theory used for the consistent quantitative analysis of the observations.

show abstract

Section: Microscopic Theory Of Strong‐field Excitations In Semiconducmentioning

confidence: 58%

“…As the creation of polarization and charge carriers, as well as their acceleration inside the bands are strongly coupled, both emission sources contribute simultaneously to the total emission

E_{out} false(t false) \propto \frac{\partial}{\partial t} P false(t false) + J false(t false)

. The frequency spectrum is obtained by a Fourier transform of

E_{out} false(t false)

and reads

\begin{matrix} true \\ right I_{out} false(ω false) = | E_{out} {(ω) false|}^{2} \propto {false| ω P (ω) + normali J (ω) false|}^{2} . \end{matrix}

Section: Microscopic Theory Of Strong‐field Excitations In Semiconducmentioning

confidence: 99%

Section: Microscopic Theory Of Strong‐field Excitations In Semiconducmentioning

confidence: 99%

Section: Microscopic Theory Of Strong‐field Excitations In Semiconducmentioning

confidence: 99%

See 2 more Smart Citations

Ultrahigh Off‐Resonant Field Effects in Semiconductors

Huttner

Kira

Koch

2017

Laser & Photonics Reviews

View full text Add to dashboard Cite

show abstract

“…It is interesting to see that the simple TLS system captures the characteristics of the HHG from solids that possess various electronic excitations. It is likely that the two-level state excitation corresponds to the optically allowed excitation at the Γ point from a valence band to a conduction band [58,59].…”

Section: Discussionmentioning

confidence: 99%

Ultrafast Dynamics of High-Harmonic Generation in Terms of Complex Floquet Spectral Analysis

et al. 2018

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Abstract:We studied the high-harmonic generation (HHG) of a two-level-system (TLS) driven by an intense monochromatic phase-locked laser based on complex spectral analysis with the Floquet method. In contrast with phenomenological approaches, this analysis deals with the whole process as a coherent quantum process based on microscopic dynamics. We have obtained the time-frequency resolved spectrum of spontaneous HHG single-photon emission from an excited TLS driven by a laser field. Characteristic spectral features of the HHG, such as the plateau and cutoff, are reproduced by the present model. Because the emitted high-harmonic photon is represented as a superposition of different frequencies, the Fano profile appears in the long-time spectrum as a result of the quantum interference of the emitted photon. We reveal that the condition of the quantum interference depends on the initial phase of the driving laser field. We have also clarified that the change in spectral features from the short-time regime to the long-time regime is attributed to the interference between the interference from the Floquet resonance states and the dressed radiation field.

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Parametric Amplification of Phase‐Locked Few‐Cycle Pulses and Ultraviolet Harmonics Generation in Solids at High Repetition Rate

Storz

Tauch

Wunram

et al. 2017

Laser & Photonics Reviews

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A high‐power femtosecond Yb:fiber system is seeded by a phase‐locked Er:fiber source and drives an ultra‐broadband optical parametric amplifier that operates at 10 MHz repetition rate. The resulting pulses display precise control of the carrier‐envelope phase. Their 8.3 fs temporal duration corresponds to 2.3 optical cycles of the 1100 nm carrier wavelength. Focusing 200 nJ of pulse energy into widegap materials generates optical harmonics up to fifth order. Even in a perturbative regime, strong effects of the carrier‐envelope phase on the emitted spectra are observed.

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Multilevel perspective on high-order harmonic generation in solids

Cited by 115 publications

References 48 publications

Ultrahigh Off‐Resonant Field Effects in Semiconductors

Ultrahigh Off‐Resonant Field Effects in Semiconductors

Ultrafast Dynamics of High-Harmonic Generation in Terms of Complex Floquet Spectral Analysis

Parametric Amplification of Phase‐Locked Few‐Cycle Pulses and Ultraviolet Harmonics Generation in Solids at High Repetition Rate

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