Interband resonant high-harmonic generation by valley polarized electron-hole pairs
Naotaka Yoshikawa,Kohei Nagai,K. Uchida,Yuhei Takaguchi,Shogo Sasaki,Yasumitsu Miyata,Koichiro Tanaka +6 more
TLDR
Even and odd high-harmonic generation up to 15th order from a variety of monolayers with different band properties are shown and the role of nonlinear interband polarization is emphasized.Abstract:
We demonstrated nonperturbative high harmonics induced by intense mid-infrared light up to 18th order that well exceed the material bandgap in monolayer transition metal dichalcogenides. The intensities of the even-order high-harmonic radiation did not monotonically decrease as the harmonic order increased. By comparing the high harmonic spectra with the optical absorption spectra, we found that the enhancement in the even-order high harmonics could be attributed to the resonance to the band nesting energy. The symmetry analysis shows that the valley polarization and anisotropic band structure lead to polarization of the high-harmonic radiation under excitation with the polarization along the zigzag direction. We also examined the possible recombination pathways of electrons and holes by calculating their dynamics in real and momentum spaces based on three-step model in solids. It revealed that, by considering the electrons and holes generated at neighboring lattice sites, the electron-hole polarization driven to the band nesting region should contribute to the high harmonic radiation. Our findings open the way for attosecond science with monolayer materials having widely tunable electronic structures.read more
Citations
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Strong-field nano-optics
Péter Dombi,Zsuzsanna Pápa,Jan Vogelsang,Sergey V. Yalunin,Murat Sivis,Georg Herink,Sascha Schäfer,Petra Groß,Claus Ropers,Christoph Lienau +9 more
TL;DR: In the strong-field regime, the amplitude and phase of the external electromagnetic field can exceed or exceed the field strengths that bind the electrons inside the medium as mentioned in this paper. But this is not the case in the non-perturbative regime.
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Circular dichroism in higher-order harmonic generation: Heralding topological phases and transitions in Chern insulators
Alexis Chacón,Alexis Chacón,Dasol Kim,Wei Zhu,Shane P. Kelly,Shane P. Kelly,Alexandre Dauphin,Emilio Pisanty,A. S. Maxwell,A. S. Maxwell,Antonio Picón,Antonio Picón,Marcelo F. Ciappina,Dong Eon Kim,Christopher Ticknor,Avadh Saxena,Maciej Lewenstein +16 more
TL;DR: In this paper, the asymmetry of the material-light emissivity while the topological phase is subjected to right-circularly (RCP) and left-circularityly polarized (LCP) mid-infrared lasers is investigated.
Journal ArticleDOI
High harmonic generation in condensed matter
Journal ArticleDOI
Chiral photocurrent in parity-violating magnet and enhanced response in topological antiferromagnet
Hikaru Watanabe,Youichi Yanase +1 more
TL;DR: In this article, a comprehensive classification of the photocurrent response arising from parity violation in bulk systems is presented, and a new type of photocurrent phenomena characteristic of parity-violating magnets, intrinsic Fermi surface effect and gyration current is found.
Journal ArticleDOI
High-harmonic generation in one-dimensional Mott insulators
TL;DR: In this article, the authors studied high-harmonic generation in the one-dimensional Hubbard model in order to understand its relation to elementary excitations as well as the similarities and differences to semiconductors.
References
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Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS 2
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TL;DR: Strong but unconventional electron-hole interactions are expected to be ubiquitous in atomically thin materials using a microscopic theory in which the nonlocal nature of the effective dielectric screening modifies the functional form of the Coulomb interaction.