2019
DOI: 10.1103/physrevb.100.214424
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High-harmonic generation by electric polarization, spin current, and magnetization

Abstract: High-harmonic generation (HHG), a typical nonlinear optical effect, has been actively studied in electron systems such as semiconductors and superconductors. As a natural extension, we theoretically study HHG from electric polarization, spin current and magnetization in magnetic insulators under terahertz (THz) or gigahertz (GHz) electromagnetic waves. We use simple one-dimensional spin chain models with or without multiferroic coupling between spins and the electric polarization, and study the dynamics of the… Show more

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Cited by 40 publications
(22 citation statements)
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“…Furthermore, in two-dimensional (2D) systems breaking inversion symmetry, such as monolayer of MoS 2 [43] or surface states of topological insulators [44], additional even-order harmonics or non-integer harmonics [44] can emerge. This has inspired recent theoretical studies on possible high harmonic generation in spin currents pumped by laser light irradiating magnetic insulators [45,46] or SO-split 2D electron gases [42] (note that in the latter case, cutoff harmonic order increases linearly with the Rashba SO coupling strength, unlike our result in Fig. 4).…”
supporting
confidence: 57%
“…Furthermore, in two-dimensional (2D) systems breaking inversion symmetry, such as monolayer of MoS 2 [43] or surface states of topological insulators [44], additional even-order harmonics or non-integer harmonics [44] can emerge. This has inspired recent theoretical studies on possible high harmonic generation in spin currents pumped by laser light irradiating magnetic insulators [45,46] or SO-split 2D electron gases [42] (note that in the latter case, cutoff harmonic order increases linearly with the Rashba SO coupling strength, unlike our result in Fig. 4).…”
supporting
confidence: 57%
“…However, the inverse Faraday effect excited by circularly polarized terahertz waves has not yet been experimentally demonstrated, despite many theoretical predictions reported. 7 Therefore, spin-polarized terahertz waves are essential for revealing electron spin-related linear and nonlinear ultrafast phenomena. In addition, spin-polarized terahertz waves naturally carrying chiral properties offer multifaceted spectroscopic capabilities for investigating low-energy macromolecular vibrations in biomaterials, understanding the mesoscale chiral architecture 8 and confidential communication.…”
Section: Introductionmentioning
confidence: 99%
“…Which of these two processes dominates the emission has been debated for a long time, and a unified HHG mechanism applicable to a wide range of solids is still lacking [12]. Recently, the scope of HHG studies has been extended to strongly correlated systems [8,9,[13][14][15][16], disordered systems [17][18][19][20], the effects of spin-polarized defects [21], spin or multiferroic systems [22,23], HHG in graphene and transition metal dicalchogenides [24,25], to mention a few.…”
mentioning
confidence: 99%