TY - JOUR
T1 - A dynamical symmetry triad in high-harmonic generation revealed by attosecond recollision control
AU - Zayko, Sergey
AU - Kfir, Ofer
AU - Bordo, Eliyahu
AU - Fleischer, Avner
AU - Cohen, Oren
AU - Ropers, Claus
N1 - Publisher Copyright:
© 2020 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft.
PY - 2020/5/1
Y1 - 2020/5/1
N2 - A key element of optical spectroscopy is the link between observable selection rules and the underlying symmetries of an investigated physical system. Typically, selection rules directly relate to the sample properties probed by light, yielding information on crystalline structure or chirality, for example. Considering light-matter coupling more broadly may extend the scope of detectable symmetries, to also include those directly arising from the interaction. In this letter, we experimentally demonstrate an emerging class of symmetries in the electromagnetic field emitted by a strongly driven atomic system. Specifically, generating high-harmonic radiation with attosecond-controlled two-color fields, we find different sets of allowed and forbidden harmonic orders. Generalizing symmetry considerations of circularly polarized high-harmonic generation, we interpret these selection rules as a complete triad of dynamical symmetries. We expect such emergent symmetries also for multi-atomic and condensed-matter systems, encoded in the spectral and spatial features of the radiation field. Notably, the observed phenomenon gives robust access to chiral processes with few-attosecond time precision.
AB - A key element of optical spectroscopy is the link between observable selection rules and the underlying symmetries of an investigated physical system. Typically, selection rules directly relate to the sample properties probed by light, yielding information on crystalline structure or chirality, for example. Considering light-matter coupling more broadly may extend the scope of detectable symmetries, to also include those directly arising from the interaction. In this letter, we experimentally demonstrate an emerging class of symmetries in the electromagnetic field emitted by a strongly driven atomic system. Specifically, generating high-harmonic radiation with attosecond-controlled two-color fields, we find different sets of allowed and forbidden harmonic orders. Generalizing symmetry considerations of circularly polarized high-harmonic generation, we interpret these selection rules as a complete triad of dynamical symmetries. We expect such emergent symmetries also for multi-atomic and condensed-matter systems, encoded in the spectral and spatial features of the radiation field. Notably, the observed phenomenon gives robust access to chiral processes with few-attosecond time precision.
KW - dynamical symmetry
KW - emergent symmetries
KW - high harmonic generation
UR - http://www.scopus.com/inward/record.url?scp=85085694439&partnerID=8YFLogxK
U2 - 10.1088/1367-2630/ab82bd
DO - 10.1088/1367-2630/ab82bd
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AN - SCOPUS:85085694439
SN - 1367-2630
VL - 22
JO - New Journal of Physics
JF - New Journal of Physics
IS - 5
M1 - 053017
ER -