Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session M06: Ultrafast Phenomena in Solid-State
2:00 PM–3:48 PM,
Wednesday, June 7, 2023
Room: 206 A
Chair: Niranjan Shivaram, Purdue University
Abstract: M06.00003 : Orbital perspective of high harmonic generation in ReS2*
2:24 PM–2:36 PM
Withdrawn
Presenter:
Álvaro Jiménez-Galán
(National Research Council of Canada)
Authors:
Álvaro Jiménez-Galán
(National Research Council of Canada)
Chandler Bossaer
(National Research Council of Canada)
Guilmot Ernotte
(University of Ottawa)
Andrew Parks
(University of Ottawa)
Rui Silva
(Instituto de Ciencia de Materiales de Madrid, CSIC)
David M Villeneuve
(Natl Res Council)
Andre Staudte
(National Research Council of Canada)
Thomas Brabec
(University of Ottawa)
Adina A Luican-Mayer
(University of Ottawa)
Giulio Vampa
(National Research Council of Canada)
Linking features in the harmonic spectrum to the electron-hole motion along specific bands requires that the bands change appreciably with crystal momenta and that they have a sizeable separation between them. Yet, many materials do not meet these conditions. One example is ReS2 whose dense and flat band structure makes associating a specific harmonic with the electron motion along a particular laser-dressed band hardly straightforward.
On the other hand, an orbital-based framework is ideally suited for these materials since the small bandwidth indicates that the electrons are very localized in the individual atoms of the lattice. Several works have discussed the importance of using a real-space perspective to understand high harmonic generation from solids; yet, there has been no evidence linking features in the harmonic spectrum to dynamics of orbitals in the lattice.
Here, we measure a strong intensity-dependent anisotropy in the high harmonic spectrum of ReS2, despite the seemingly isotropic band structure. We use numerical theory to reveal how this is a manifestation of interferences between localized orbitals in the lattice and show how the intensity and polarization of the laser field activates or suppresses specific atoms from the laser-driven dynamics that leads to the emission of a particular harmonic order, offering an orbital-perspective of high harmonic generation in solids.
*European Union's Horizon 2020 Grant Agreement No. 101028938. Joint Center for Extreme Photonics. National Research Council's Quantum Sensing program.
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