Microscopic analysis of high‐harmonic generation in semiconductor nanostructures

Golde, D.; Meier, Torsten; Koch, S. W.

doi:10.1002/pssc.200880309

Cited by 15 publications

(18 citation statements)

References 20 publications

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“…Therefore, intraband effects strongly modulate the polarization dynamics. As long as inter and intraband transitions are properly considered in the microscopic calculations, polarization and current sources together produce strongly enhanced emission intensity compared to an artificial case where only polarization dynamics is allowed and the gradient terms are omitted . While Ref.…”

Section: Microscopic Theory Of Strong‐field Excitations In Semiconducmentioning

confidence: 99%

“…For a fully consistent description, one needs quantum‐mechanical models such as the SBE, the solution of the time dependent many‐body Schrödinger equation, or a density matrix approach in order to properly capture the interplay between intra‐ and interband excitations in two bands and multi‐band models . Also Refs.…”

Section: Microscopic Theory Of Strong‐field Excitations In Semiconducmentioning

confidence: 99%

“…[12,13,[74][75][76][77][78][79] Nevertheless, both emission sources are intrinsically coupled and equally important as demonstrated in Refs. [37,59,80] in a twoband SBE analysis. In an unexcited semiconductor, carriers can only be created via a polarization between valence and conduction bands.…”

Section: The Renormalized Rabi Energymentioning

confidence: 99%

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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.

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Section: Microscopic Theory Of Strong‐field Excitations In Semiconducmentioning

confidence: 99%

Section: Microscopic Theory Of Strong‐field Excitations In Semiconducmentioning

confidence: 99%

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Ultrahigh Off‐Resonant Field Effects in Semiconductors

Huttner

Kira

Koch

2017

Laser & Photonics Reviews

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“…In the case of solids, electrons are promoted to discrete conduction bands, where they do not evolve freely. This leads, for instance, to a different linear field dependence for the cutoff energy [6], different time-frequency characteristics of the harmonic emission between atoms and solids [8,11,16], and a different ellipticity dependence [6,17].Historically, HHG in solids was first discussed in terms of Bloch oscillations (i.e., pure intraband dynamics) [18][19][20], and more recently mainly analyzed using simplified models based on numerical solutions of the semiconductor Bloch equations [21][22][23] treating the complex, coupled interband and intraband dynamics, with the exception of the ab initio simulations of Ref. [24].…”

mentioning

confidence: 99%

“…Historically, HHG in solids was first discussed in terms of Bloch oscillations (i.e., pure intraband dynamics) [18][19][20], and more recently mainly analyzed using simplified models based on numerical solutions of the semiconductor Bloch equations [21][22][23] treating the complex, coupled interband and intraband dynamics, with the exception of the ab initio simulations of Ref. [24].…”

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confidence: 99%

Impact of the Electronic Band Structure in High-Harmonic Generation Spectra of Solids

et al. 2017

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An accurate analytic model describing the microscopic mechanism of high-harmonic generation (HHG) in solids is derived. Extensive first-principles simulations within a time-dependent density-functional framework corroborate the conclusions of the model. Our results reveal that (i) the emitted HHG spectra are highly anisotropic and laser-polarization dependent even for cubic crystals; (ii) the harmonic emission is enhanced by the inhomogeneity of the electron-nuclei potential; the yield is increased for heavier atoms; and (iii) the cutoff photon energy is driver-wavelength independent. Moreover, we show that it is possible to predict the laser polarization for optimal HHG in bulk crystals solely from the knowledge of their electronic band structure. Our results pave the way to better control and optimize HHG in solids by engineering their band structure. DOI: 10.1103/PhysRevLett.118.087403 Atoms and molecules interacting with strong laser pulses emit high-order harmonics of the fundamental driving laser field. The high-harmonic generation (HHG) in gases is routinely used nowadays to produce isolated attosecond pulses [1][2][3][4] and coherent radiation ranging from the visible to soft x rays [5]. Because of a higher electronic density, solids are one promising route towards compact, brighter HHG sources. The recent observation of nonperturbative HHG in solids without damage [6][7][8][9][10], extending even beyond the atomic limit [10], has opened the door to the observation and control of attosecond electron dynamics in solids [8,9,11], all-optical band-structure reconstruction [12], and solid-state sources of isolated extreme-ultraviolet pulses [9,11]. However, in contrast to HHG from gases, the microscopic mechanism underlying HHG from solids is still controversially debated in the attoscience community, in some cases casting doubts on the validity of the proposed microscopic model and resulting in confusion about the correct interpretation of experimental data. Various competing simplified models have been proposed but they often are based on strong approximations and a priori assumptions, often stating that there is a strong similarity with the processes underlying atomic-gas HHG emission. However, it is clear that many-body effects due to the crystalline structure of solids and the fermionic nature of interaction electrons play a decisive role that fundamentally distinguishes the solid from the gas case. It is the scope of the present work to unravel within an ab initio approach what the impact is of the underlying electronic band structure of the solids in the observed HHG emission.The process of HHG from gases is by now well understood in terms of the three-step model [13][14][15] in which electrons are first promoted from the ground state of the atom (or molecule) to the continuum, then accelerated by the electric field, and finally recombine with the parent ion. With this simple, intuitive model most of the observed effects are well described, in particular, the dependence of the harmonic cutoff energ...

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Theoretical study of armchair single-walled carbon nanotubes in the presence of a strong laser field: high harmonic generation

Daneshfar

Bahari

2012

Appl. Phys. A

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Microscopic analysis of high‐harmonic generation in semiconductor nanostructures

Cited by 15 publications

References 20 publications

Ultrahigh Off‐Resonant Field Effects in Semiconductors

Ultrahigh Off‐Resonant Field Effects in Semiconductors

Impact of the Electronic Band Structure in High-Harmonic Generation Spectra of Solids

Theoretical study of armchair single-walled carbon nanotubes in the presence of a strong laser field: high harmonic generation

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