THz-driven strong-field dynamics in solids: High-harmonic generation and quasiparticle collisions

2017 ◽  
Author(s):  
F. Langer ◽  
M. Hohenleutner ◽  
C.P. Schmid ◽  
S. Schlauderer ◽  
U. Huttner ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Strong Field ◽  
High Harmonic ◽  
High Harmonic Generation

scholarly journals Quantum Optical Aspects of High-Harmonic Generation

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 269
Author(s):  
Sándor Varró
Keyword(s):  
Harmonic Generation ◽  
Quantum Electrodynamics ◽  
Strong Field ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Joint Effect ◽  
Analytic Solutions ◽  
Binding Potential ◽  
Atom Interaction ◽  
Quantum Optical

The interaction of electrons with strong laser fields is usually treated with semiclassical theory, where the laser is represented by an external field. There are analytic solutions for the free electron wave functions, which incorporate the interaction with the laser field exactly, but the joint effect of the atomic binding potential presents an obstacle for the analysis. Moreover, the radiation is a dynamical system, the number of photons changes during the interactions. Thus, it is legitimate to ask how can one treat the high order processes nonperturbatively, in such a way that the electron-atom interaction and the quantized nature of radiation be simultaneously taken into account? An analytic method is proposed to answer this question in the framework of nonrelativistic quantum electrodynamics. As an application, a quantum optical generalization of the strong-field Kramers-Heisenberg formula is derived for describing high-harmonic generation. Our formalism is suitable to analyse, among various quantal effects, the possible role of arbitrary photon statistics of the incoming field. The present paper is dedicated to the memory of Prof. Dr. Fritz Ehlotzky, who had significantly contributed to the theory of strong-field phenomena over many decades.

scholarly journals Chiral high-harmonic generation and spectroscopy on solid surfaces using polarization-tailored strong fields

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tobias Heinrich ◽  
Marco Taucer ◽  
Ofer Kfir ◽  
P. B. Corkum ◽  
André Staudte ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Harmonic Generation ◽  
Strong Field ◽  
Condensed Matter ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Nonlinear Spectroscopy ◽  
Field Methods ◽  
Circularly Polarized ◽  
Symmetry Properties

AbstractStrong-field methods in solids enable new strategies for ultrafast nonlinear spectroscopy and provide all-optical insights into the electronic properties of condensed matter in reciprocal and real space. Additionally, solid-state media offers unprecedented possibilities to control high-harmonic generation using modified targets or tailored excitation fields. Here we merge these important points and demonstrate circularly-polarized high-harmonic generation with polarization-matched excitation fields for spectroscopy of chiral electronic properties at surfaces. The sensitivity of our approach is demonstrated for structural helicity and termination-mediated ferromagnetic order at the surface of silicon-dioxide and magnesium oxide, respectively. Circularly polarized radiation emanating from a solid sample now allows to add basic symmetry properties as chirality to the arsenal of strong-field spectroscopy in solids. Together with its inherent temporal (femtosecond) resolution and non-resonant broadband spectrum, the polarization control of high harmonics from condensed matter can illuminate ultrafast and strong field dynamics of surfaces, buried layers or thin films.

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