A real space perspective of high harmonic generation in crystalline solids

Lakhotia, Harshit; Zhan, Minjie; Kim, Hee‐Yong; Goulielmakis, Eleftherios

doi:10.1364/cleo_qels.2018.ff2p.5

Cited by 1 publication

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“…Since cubic or tetragonal systems do not have such magic harmonics, magic harmonics found here present an opportunity to develop HHG into a possible structure characterization tool for phase transitions between hexagonal and nonhexagonal structures [18] in varieties of materials [19][20][21][22][23][24][25][26][27][28]. Our finding complements the prior studies using linearly polarized light [6,29,30] well.…”

Section: Introductionsupporting

confidence: 79%

Magic high-order harmonics from a quasi-one-dimensional hexagonal solid

Zhang

Bai

2019

Phys. Rev. B

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High-order harmonic generation (HHG) from atoms is a coherent light source that opens up attosecond physics, but it is the application of HHG to solids that brings much of excitement for the last decade. Here we report a completely new kind of harmonics in a quasi-one-dimensional and hexagonal barium titanium sulfide: Under circularly polarized laser excitation, harmonics are generated only at first, fifth, seventh and eleventh orders. These magic harmonics appear only with circularly polarized light, not with linearly polarized light. Neither cubic nor tetragonal cells have magic harmonics even with circularly polarized light. Through a careful group-theory analysis, we find that two subgroups of symmetry operations unique to the hexagonal symmetry cancel out third and ninth harmonics. This feature presents a rare opportunity to develop HHG into a crystal-structure characterization tool for phase transitions between hexagonal and nonhexagonal structures.

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