Year: 2019
Type: article
Abstract: High-harmonic generation in solids is a unique tool to investigate the electron dynamics in strong light fields. The systematic study in monolayer materials is required to deepen the insight into the fundamental mechanism of high-harmonic generation. Here we demonstrated nonperturbative high harmonics up to 18th order in monolayer transition metal dichalcogenides. We found the enhancement in the even-order high harmonics which is 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. The calculation based on the three-step model in solids revealed that the electron-hole polarization driven to the band nesting region should contribute to the high harmonic radiation, where the electrons and holes generated at neighboring lattice sites are taken into account. Our findings open the way for attosecond science with monolayer materials having widely tunable electronic structures.
Source: Nature Communications
Authors: Naotaka Yoshikawa, Kohei Nagai, Kento Uchida, Yuhei Takaguchi, Shogo Sasaki, Yasumitsu Miyata, Koichiro Tanaka
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $5,200
Awards: テラヘルツ光を用いた単層２次元半導体におけるバレー分極の制御, High harmonic spectroscopy of non-equilibrium electron dynamics in phase change materials, Dynamical control of electronic states using extremely strong terahertz light, New development of nonlinear photoelectronics based on terahertz strong field physics, G4177341369, G4442506492, G7362068214, G7897247881, Fabrication of atomic wires by 1D heteroepitaxy
OpenAlex ID: W2916725176