Dependence of quantum timescales on symmetry
Abstract
The role of time in quantum mechanics and the timescale associated with quantum transitions remains an open question in physics, especially on an experimental level. Here we use an experimental method based on spin- and angle-resolved photoemission spectroscopy from spin-degenerate dispersive states to determine the Eisenbud-Wigner-Smith time delay of photoemission. This timescale of the quantum transition is measured for materials with different dimensionality and correlation strength. A direct link is found between the dimensionality, or rather the symmetry, of the system and the attosecond timescale of the quantum transition. The quasi 2-dimensional transition metal dichalcogenides 1T-TiSe 2 and 1T-TiTe 2 show timescales around 150 as, whereas in quasi 1-dimensional CuTe, the transition takes more than 200 as. This is in stark contrast with the 26 as obtained for 3-dimensional pure Cu. These results provide new insights into the role of symmetry in quantum timescales and may provide a route to understanding the role of time in quantum mechanics.
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BibTeX
@article{guo2026dependence,
title = {{Dependence of quantum timescales on symmetry}},
author = {Fei Guo and Dmitry Usanov and Eduardo Guedes and Mauro Fanciulli and Kaishu Kawaguchi and Ryo Mori and Takeshi Kondo and Arnaud Magrez and Michele Puppin and J. Hugo Dil},
journal = {R and d -Newton-},
year = {2026},
month = oct,
doi = {10.1016/j.newton.2025.100374},
eprint = {2506.01476},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05837636v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - Dependence of quantum timescales on symmetry
AU - Fei Guo
AU - Dmitry Usanov
AU - Eduardo Guedes
AU - Mauro Fanciulli
AU - Kaishu Kawaguchi
AU - Ryo Mori
AU - Takeshi Kondo
AU - Arnaud Magrez
AU - Michele Puppin
AU - J. Hugo Dil
PY - 2026
DA - 2026/10/23
JO - R and d -Newton-
DO - 10.1016/j.newton.2025.100374
UR - https://hal.science/hal-05837636v1
AB - The role of time in quantum mechanics and the timescale associated with quantum transitions remains an open question in physics, especially on an experimental level. Here we use an experimental method based on spin- and angle-resolved photoemission spectroscopy from spin-degenerate dispersive states to determine the Eisenbud-Wigner-Smith time delay of photoemission. This timescale of the quantum transition is measured for materials with different dimensionality and correlation strength. A direct link is found between the dimensionality, or rather the symmetry, of the system and the attosecond timescale of the quantum transition. The quasi 2-dimensional transition metal dichalcogenides 1T-TiSe 2 and 1T-TiTe 2 show timescales around 150 as, whereas in quasi 1-dimensional CuTe, the transition takes more than 200 as. This is in stark contrast with the 26 as obtained for 3-dimensional pure Cu. These results provide new insights into the role of symmetry in quantum timescales and may provide a route to understanding the role of time in quantum mechanics.
SN - 0746-9179
ER -