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Dephasing Dynamics Accessed by High Harmonic Generation: Determination of Electron-Hole Decoherence of Dirac Fermions

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Title
Dephasing Dynamics Accessed by High Harmonic Generation: Determination of Electron-Hole Decoherence of Dirac Fermions
Author(s)
Kim, Youngjae; Min Jeong Kim; Soonyoung Cha; Shinyoung Choi; Cheol-Joo Kim; B.J. Kim; Moon-Ho Jo; Jonghwan Kim; Lee, JaeDong
Publication Date
2024-01
Journal
Nano Letters, v.24, no.4, pp.1277 - 1283
Publisher
American Chemical Society
Abstract
We reveal the critical effect of ultrashort dephasing on the polarization of high harmonic generation in Dirac fermions. As the elliptically polarized laser pulse falls in or slightly beyond the multiphoton regime, the elliptically polarized high harmonic generation is produced and exhibits a characteristic polarimetry of the polarization ellipse, which is found to depend on the decoherence time T2. T2 could then be determined to be a few femtoseconds directly from the experimentally observed polarimetry of high harmonics. This shows a sharp contrast with the semimetal regime of higher pump intensity, where the polarimetry is irrelevant to T2. An access to the dephasing dynamics would extend the prospect of high harmonic generation into the metrology of a femtosecond dynamic process in the coherent quantum control. © 2024 American Chemical Society.
URI
https://pr.ibs.re.kr/handle/8788114/14993
DOI
10.1021/acs.nanolett.3c04278
ISSN
1530-6984
Appears in Collections:
Center for Van der Waals Quantum Solids(반데르발스 양자 물질 연구단) > 1. Journal Papers (저널논문)
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