Symmetry-controlled temporal structure of high-harmonic carrier fields from a bulk crystal

Langer, Fabian; Hohenleutner, Matthias; Huttner, Ulrich; Koch, S. W.; Kira, M.; Huber, Rupert

doi:10.1038/nphoton.2017.29

Cited by 158 publications

(116 citation statements)

References 35 publications

(50 reference statements)

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“…The emission of even harmonics polarized perpendicular to the driving field has also been observed in bulk GaSe which also exhibits a hexagonal crystal lattice with broken spatial inversion symmetry. In the experiments, rotating the crystal relative to the polarization of the driving laser, an arbitrary polarization angle between the emitted even and odd harmonic orders could be adjusted.…”

Section: High‐harmonic Generationmentioning

confidence: 76%

“…Strong‐field excitations generally involve such significant complications, which makes the use of simplified trajectory models limited. So far, only full many‐body approaches have quantitatively explained details of HHG experiments …”

Section: Microscopic Theory Of Strong‐field Excitations In Semiconducmentioning

confidence: 99%

“…Such sources have been realized in the last years enabling the first experimental realization of HHG in ZnO with mid‐infrared light and GaSe with THz light. These observations have sparked great interest and triggered a whole series of subsequent experiments demonstrating HHG in a variety of semiconducting materials and dielectrics …”

Section: High‐harmonic Generationmentioning

confidence: 99%

See 2 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.

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Section: High‐harmonic Generationmentioning

confidence: 76%

Section: Microscopic Theory Of Strong‐field Excitations In Semiconducmentioning

confidence: 99%

Section: High‐harmonic Generationmentioning

confidence: 99%

See 1 more Smart Citation

Ultrahigh Off‐Resonant Field Effects in Semiconductors

Huttner

Kira

Koch

2017

Laser & Photonics Reviews

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“…The sample was a single crystal of 100 μm-thick gallium selenide (GaSe), which shows efficient HHG emission, i.e., strong light-electron interactions [13][14][15]. Since the photon energy of the MIR pulse (0.26 eV) is much larger than the phonon energy in GaSe (< 0.04 eV) [16], direct excitation of phonon modes is sufficiently suppressed.…”

Section: Main Textmentioning

confidence: 99%

Inherent limit to coherent phonon generation under nonresonant light-field driving

et al. 2020

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Coherent manipulation of quasi-particles is a crucial method to realize ultrafast switching of the relating macroscopic order. In this letter, we studied coherent phonon generation under strong light field which allows to induce non-perturbative nonlinear optical phenomena in solids. The efficiency of coherent phonon generation starts to saturate and deviate from the pronounced linear power dependence when the light intensity goes into the non-perturbative regime. We propose a novel theoretical model based on Floquet picture and show that the saturation is due to a limitation of the driving force inherent in non-resonant driving of the electronic system in the non-perturbative regime.

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“…harmonic generation [14][15][16][17]. Similarly, symmetry-breaking is widely used in surface-sensitive sum-frequency generation [18], second-harmonic imaging of multiferroic domains in solids [19], and high-order harmonic generation from atoms [20][21][22], molecules [23,24] and solids [25][26][27][28].…”

mentioning

confidence: 99%

A dynamical symmetry triad in high-harmonic generation revealed by attosecond recollision control

et al. 2020

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A key element of optical spectroscopy is the link between observable selection rules and the underlying symmetries of an investigated physical system. Typically, selection rules directly relate to the sample properties probed by light, yielding information on crystalline structure or chirality, for example. Considering light-matter coupling more broadly may extend the scope of detectable symmetries, to also include those directly arising from the interaction. In this letter, we experimentally demonstrate an emerging class of symmetries in the electromagnetic field emitted by a strongly driven atomic system. Specifically, generating high-harmonic radiation with attosecond-controlled two-color fields, we find different sets of allowed and forbidden harmonic orders. Generalizing symmetry considerations of circularly polarized high-harmonic generation, we interpret these selection rules as a complete triad of dynamical symmetries. We expect such emergent symmetries also for multi-atomic and condensed-matter systems, encoded in the spectral and spatial features of the radiation field. Notably, the observed phenomenon gives robust access to chiral processes with few-attosecond time precision.The concept of emergence describes the appearance of entirely new properties of a coupled system, which only arise from the interaction of its constituents. In light-matter interaction, emergent phenomena are particularly prominent in strongly driven states of matter, as evident in light-induced variants of superconductivity [1], the Hall effect [2], and topological insulators [3] in the condensed phase, as well as exceptional points in molecules [4,5], Kramers-Henneberger states in gases [6,7], and time-crystals in isolated many-body systems [8,9]. Such emergent states are often governed by novel symmetry properties and topologies, which may be probed by external or emitted radiation fields. However, while much attention is drawn to the light-induced creation of novel states of matter, a wider scope should also include possible emergent states of the radiation field.Here, we report on the experimental observation of an emergent class of symmetries in the electromagnetic field emitted by a strongly driven atomic system. Specifically, we analyze the sets of allowed and forbidden harmonic orders in high-harmonic generation from tailored bi-circular and bi-elliptical fields. Corroborated by theoretical modeling, the identified selection rules correspond to a complete triad of dynamical symmetries. We believe that the general principles underlying our observations will be equally relevant for other systems, including crystalline solids.Spectral and polarization selection rules serve as direct measures for the symmetries of the underlying Hamiltonian and interaction [10,11]. Canonical examples in linear and perturbative nonlinear probing are molecular analysis by Raman and infrared spectroscopy [12,13] or selection rules in wave mixing and

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Symmetry-controlled temporal structure of high-harmonic carrier fields from a bulk crystal

Cited by 158 publications

References 35 publications

Ultrahigh Off‐Resonant Field Effects in Semiconductors

Ultrahigh Off‐Resonant Field Effects in Semiconductors

Inherent limit to coherent phonon generation under nonresonant light-field driving

A dynamical symmetry triad in high-harmonic generation revealed by attosecond recollision control

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